How To Repair Car Backfiring

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control applied science.

Engine backfires can be produced by:

a vacuum leak
bad timing
problems in the ignition system
lean or rich air/fuel mixture
a faulty sensor
an frazzle leak
or some other system mistake

Sometimes, locating the source won't have you much time, other times it can show difficult.

The backfire is produced when unburned fuel ignites inside the intake or frazzle manifold instead of a cylinder. Y'all can hear the combustion as a mild, cough-similar ignition or a loud bang. A strong explosion, though, can damage an intake air temperature (IAT) sensor mounted in the intake manifold, a brake booster vacuum chack valve, and even cause severe damage, similar cracking an exhaust manifold or plastic intake manifold.

Although a backfire can be the fault of a system malfunction, this malfunction may come from maintenance neglect. Have y'all forgotten to service i or more than engine systems lately? Start with those if yous see them mentioned here. This strategy will make your diagnostic easier and your repair faster.

Yep, many backfires tin be prevented with a little maintenance as suggested in your car owner's transmission or the vehicle repair manual. If y'all don't have your repair manual yet, yous should get 1. Get an inexpensive Haynes aftermarket manual at Amazon for your particular vehicle make and model. These manuals include many maintenance tasks, troubleshooting strategies and repairs y'all can do at home.

Also, recollect that some faults will trigger the Check Engine Light (CEL). But, fifty-fifty if yous're dealing with an intermittent backlash result and you oasis't seen the CEL coming on, scan your automobile'southward computer memory with an OBD-2 scanner (like this Ancel scanner) to get diagnostic trouble codes (DTCs) anyway. The computer may take one or more awaiting codes that could give yous a clue about a potential system involved in the trouble. DTCs are very helpful in locating fault sources.

This article will depict the causes of backfires, starting with the near mutual and progressing towards the more rare causes, to help yous speed up your diagnostic.


Index
I. Ignition System Problems
Two. Injection System Bug
Iii. Engine Sensor Bug
IV. Bug with the EGR Arrangement
V. Ignition Timing Problems
VI. Frazzle System Leaks
Seven. Valve Train Problems

A bad ignition coils and other ignition system components can cause backfires. — A bad ignition coils and other ignition organisation components can cause backfires.

Photo courtesy of Nick Ares on Wikimedia

I. Ignition Organisation Issues

Any problem that upsets an ignition system spark tin cause backfires and other engine performance issues.

An engine needs a few m volts of potential for the spark to jump the gap between the centre and side electrode at the tip of a spark plug.

Lack of proper ignition system maintenance can cause problems that ultimately lead to backfires.

For example, a spark plug gap may widen after the plug has been in functioning for months and get in difficult for the spark to bound. Also, carbon buildup may isolate the electrodes, preventing proper combustion. Unburned fuel then is allowed to pass into the exhaust system where information technology tin can backfire.

Gyre to Continue

II. Injection System Bug

Backfiring problems can also originate in the fuel system.

Usually, when an injector clogs or wears out, causing the air-fuel mixture to lean, the combustion procedure weakens and fails to properly burn the fuel. Too much unburned fuel then enters the exhaust system where the fuel ignites with a loud bang.

Cheque the fuel injectors for proper operation. You can utilise a mechanic'due south stethoscope and a digital multimeter to cheque the operation of the injectors in your vehicle.

Likewise, a lean fuel mixture tin be acquired by a bad fuel pressure level regulator, fuel pump or even a bottleneck fuel filter. Consult your vehicle repair manual, if necessary, to check the fuel system and maintenance items in your particular model.

Check your MAF sensor for dirt and operation. — Cheque your MAF sensor for dirt and performance.

Photograph courtesy of Gill Sensors on Wikimedia

Three. Engine Sensor Problems

An engine sensor malfunction can also lead to backfires.

Take for example a bad mass air flow (MAF) sensor. The engine reckoner uses this and other sensors to compute the corporeality of fuel to inject into the engine according to operating conditions. If a sensor fails to ship the right signal, the computer may deliver also piddling fuel, creating a lean fuel status.

Ordinarily, a bad MAF sensor will trigger the Check Engine Lite (CEL). And many other emission related sensors the computer rely on tin can fail as well, causing a CEL to come up on.

Just remember that even if your computer points to a possible bad sensor, make sure to examination the sensor before replacing it. Many times a fault in a different component or part can make a sensor look bad. For example, a duct in the air cleaner assembly with a tear or not properly connected may cause unmetered air to enter the engine and make the calculator 'retrieve' that the MAF sensor has gone mad, causing all kinds of bug.

Check and replace the EGR valve as necessary.

Photo courtesy of Towel401 on Wikimedia

4. Problems With the EGR System

The frazzle gas recirculation (EGR) system, normally the valve, tin can cause all kinds of problem when not functioning properly. Backlash is one of them.

The EGR organisation is designed to reintroduced a measured amount of exhaust gases back into the cylinders for reburn. This reduces combustion temperatures and dangerous emissions similar NOx (oxides of nitrogen).

The EGR valve opens when engine speed increases and closes when engine is resting at idle. However, a stuck-close valve won't allow exhaust gases to recirculate back into the combustion chamber. Sometimes this happens when carbon buildup blocks valve passages, a vacuum leak fails to operate the valve (on vacuum operated valves), an electronic control sensor fails, or the valve itself is damaged. If necessary, check for vacuum leaks, including intake and frazzle gasket leaks, vacuum hoses, and air intake boot.

This condition will increase cylinder temperature during engine operation, causing a flame to expand speedily through an open intake valve and burn the fuel coming in, resulting in a backlash. The error is similar to the 1 shown by a carburetor with a faulty accelerator pump. Watch the video at the bottom to see a backfire taking identify through the intake manifold, possibly from a vacuum leak.

If you haven't checked the EGR valve in the last 2 or three years, practice so now. Make sure the valve still opens and that passages are non blocked. Removing the EGR valve for inspection may be piece of cake or difficult, depending on your item vehicle model. Just in well-nigh cases you can do this maintenance task at abode. Bank check for carbon buildup along the valve passages and the intake manifold where the valve mounts.

A worn out timing belt can upset the combustion process and lead to backfires. — A worn out timing belt tin upset the combustion process and pb to backfires.

Photo courtesy of Petar Milošević on Wikimedia

V. Ignition Timing Problems

Gasoline engines need to burn down spark plugs on time to properly ignite the air-fuel mixture within a cylinder. On time means that sometimes the spark needs to be fired ahead in accelerate or retarded depending on engine speed and load weather condition.

Just firing a spark likewise much in advance before a cylinder pinch stroke tin cause engine knocks or pings.

On the other hand, retarding the spark too much later the cylinder compression stroke will not only crusade engine to lose power and waste fuel, but can besides lead to frazzle backlash (aka afterfire). This is because flames from the combustion can jump through an open up frazzle valve and crusade unburned fuel to explode in the exhaust system.

Usually, this condition causes the engine to overheat and, with high enough temperature, seriously impairment the exhaust manifold.

Consult your vehicle repair manual to cheque engine timing. On older vehicle models equipped with a distributor, cheque for a cracked or damaged benefactor cap, and cheque ignition timing. Replace the cap or adjust timing as necessary, using your vehicle repair manual.

On newer vehicle models, though, the engine control module (ECM-car computer) unremarkably controls ignition timing. You yet tin can check the timing but you can't adjust it yourself. If timing is not correct, consult your vehicle repair transmission or have your engine checked at a motorcar shop to right the problem.

A backfire can originate in a cracked exhaust manifold and or leaking gasket. — A backfire can originate in a croaky exhaust manifold and or leaking gasket.

Photograph in the Public Domain

Half dozen. Frazzle Arrangement Leaks

Exhaust backfires can also be the result of air leaks in the system.

As oxygen content increases, it causes partially fire or unburned fuel entering the organization to ignite loudly. The extra oxygen may come up through a leak in the exhaust manifold gasket, an exhaust piping sealing ring, or a damaged piping.

Also, some vehicles models are equipped with an air injection system. If the system is injecting air when it shouldn't or has stopped working, it may cause unburned or partially burned fuel in the exhaust gases to backfire. Bank check the system for proper performance, especially the check valve. Consult the repair transmission for your vehicle make and model.

Vii. Valve Train Bug

To let air-fuel into the combustion bedroom and remove exhaust gases, intake and exhaust valves need to open and close at their proper time

Just valve railroad train components can also fail and cause a number of issues.

For case, a valve spring may weaken or brake, causing a valve to fail to properly seal the combustion chamber every bit needed or cause it to remain partially open; carbon build upwardly and other substances may crusade a valve to stick open too. Any of these weather condition can allow flames to burn fuel dorsum in the intake manifold, throttle trunk, or exhaust manifold, leading to a backfire and other issues.

Valve issues may also involve poor fuel economy, rough idle, stalling, high oil consumption, hard starting, and exhaust smoke.

Valve problems of these type tend to create a more consistent backlash condition.

You may diagnose valve problems at dwelling house with the apply of a compression gauge or a vacuum estimate. These tools tin can help reveal the mechanical condition of your engine. If necessary, consult your vehicle repair transmission.

Diagnosing engine backfires tin can be difficult at times. But, as you've seen, the root crusade of a backfire tin be something as unproblematic as a bottleneck fuel filter or something more than complicated every bit a sticking valve.

Whenever you are dealing with a backfire, try to gear up the crusade as soon as possible. A strong backfire can impairment gaskets, sensors, valves, and even a plastic intake manifold.

So paying attention to regular maintenance items in central systems like fuel, ignition and emissions can become a long way in keeping your vehicle running in pinnacle shape. And whenever you see a backfire, this guide will help you trace the culprit.

This commodity is authentic and true to the best of the author's knowledge. Content is for advisory or entertainment purposes only and does not substitute for personal counsel or professional person advice in business, financial, legal, or technical matters.

Questions & Answers

Question: I have a 1988 GMC Candida 2500 with a 4.iii l motor. I just did a tune up on it, and later on, it ran like it's supposed to. At least it ran, only now it won't start. All it does when I try to start it is backlash, and with forcefulness. I'm scared to attempt to showtime information technology because I don't desire to damage anything. What should I do?

Reply: If you didn't modify the distributor cap, check it for cracks, as well cheque or change the spark plug wires. If the ignition system parts are fine, check the timing, it may be too retarded.

Question: I've been working on a 1973 Chevy 351 Mercruiser, and nosotros did all the maintenance on it including new spark plugs, cap, rotor, spark plug wires, and new gaskets for the exhaust manifolds. At offset, it was starting up every time and all of a sudden it won't commencement, and if tries information technology backfires. Whatever ideas?

Answer: If you didn't have any issues with the timing, cheque for vacuum leaks. The problem can also exist in the carburetor - issues with the choke, accelerator pump discharge -- y'all may accept a lean mixture.

Question: I take a 1992 Dodge Caravan. It turns over, but backfires loudly and will not start. What should I exercise?

Answer: Check for vacuum leaks and good spark. Hoses or gaskets, bad ignition coil, module, distributor. These are the main suspects. Only a sensor tin too cause trouble. Even if you don't see the cheque engine low-cal on, scan for problem codes. A pending lawmaking tin can give yous some clues about the problem.

Question: I have a 2006 Ford Expedition with the 5.4 Triton. My bank check engine light came on, and it gave me the P0300 code which is multiple misfire code forth with four other cylinders misfiring. When I get on the gas pedal, it backfires from the exhaust and the engine and chugs real bad. I checked spark plugs and wires and replaced the fuel pump and filter, and none of that helped. Any suggestions?

Answer: The problem tin can exist with the ignition or fuel systems. Practise a fuel pressure test, and examine the spark plugs. They can requite yous an indication of what is going on inside the cylinders. Apply the chart in your vehicle repair transmission to read the plugs. If necessary, do a compression and vacuum tests.

Question: I take a 1996 Chevy Silverado 1500. It spits and sputters. The plug wires, cap, rotor, 02 sensor in rear, and ignition coil was just changed. It did nothing to set the problem. It says multiple misfires simply tin can't figure out what the trouble is tin you please help?

Answer: This other mail may help:

https://axleaddict.com/auto-repair/P0300-Random-Mi...

Question: I take a 1966 Chevy Suburban with a 327 4 barrel. I replaced the carburetor with brand new one. It is spitting dorsum through the carburetor trying to start. I likewise changed the rotor and distributor cap and spark plugs. The wires are 2 years quondam and await good. Can information technology exist timing? If so, how practise you time information technology if it's not running?

Answer: There could be several possibilities, and yes, the timing could be ane of them.

However, if the vehicle was running fine (proper ignition timing) before yous installed the new carburetor, it may be a faulty accelerator pump belch. Likewise, check choke operation.

Too, the choke valve initial clearance might exist too big.

Y'all may need your vehicle repair manual to cheque or make adjustments.

Another possibility is the fuel mixture is too lean.

Question: I accept a 90 Ram Charger with a 360 engine. I put in a new MSD distributor, new cap, rotor, wires and plugs. Timing is ready to service transmission specs; changed carb out 3 times; a new fuel pump with correct corporeality of pressure, and a new filter. The vehicle backfires at 40mph and will not become over that speed, acceleration and deceleration are perfect, lots of power but only stops at 40 mph with backfiring. It gets worse if try to hold at that speed. What could it be?

Answer: Make sure to check for trouble codes, fifty-fifty if the cheque engine low-cal is not on. Several faults can crusade this trouble, for instance a clogged catalytic converter. But a mutual problem is a muddied MAF sensor. Other problems include clogged fuel injectors, faulty MAP, or TPS sensors, or vacuum leaks.

Question: I have a 95 Wrangler that had a bad ignition coil, causing it to hesitate at high RPM. Later changing the coil, plugs, wires, cap, and rotor. I now accept an intermittent backlash at high RPM. What practice yous think I should do?

Answer: You might want to bank check the fuel system, possibly a weak pump, clogging fuel injector or filter. Other possibilities, a dirty MAF.

Question: I have a '77 Corvette Stingray whose engine misses and backfires. I've had timing reset, changed plugs, and verified in that location is no exhaust leak. I've also bought a new filter and carburetor. Any suggestions?

Answer: Bad plug wires (jumping spark) and a bad distributor cap are mutual to both misses and backfires. Other things you might want to check: vacuum leak, bad fuel injectors, and the carburetor accelerator pump.

Question: I have a 1992 Honda that backfires when started. What can I do to ready it?

Answer: Cheque the fuel pressure level, and then check the ignition timing and ignition system, in that order.

Question: I have a 1970 Chevy Monte Carlo. I've had the valves, cam, timing chain, distributor, and wires changed. The carb has been adjusted; timing is at 0, and the distributor is facing #1 cylinder. The machine seems to be tuned correctly, simply whenever I drive, it backfires. While idling, it sounds fine. Backfires simply when driving. Do you accept whatever thoughts?

Respond: Double check on the recommended valve lash setting for the new camshaft and check the pushrods. Those are the things that come to listen.

Question: Will removing the EGR system cause backfiring?

Answer: If EGR passages to the intake are blocked, it tin can crusade backlash with the increase in cylinders temperature. This is normally the case with carbon-blocked or stuck-close EGR valves.

Question: I have a 1957 Chevy with a 283. Sometimes she stutters and and then backfires when I beginning step on the gas and sometimes at most 40 mph. I accept checked the timing and it seems correct. Suggestions?

Answer: Bank check the distributor cap for impairment or carbon tracking. As well, this tin can happen sometimes if the engine is running rich and ignition timing is retarded.

Question: 1994 Chevy 350. Backfires when accelerating. Already changed fuel pump, filter, vacuum hoses, TPS, and benefactor cap, but withal backfiring. Exercise y'all know why?

Respond: Check the fuel pressure regulator

https://axleaddict.com/auto-repair/How-to-Test-a-F...

and the air injection organization.

Question: I have a 2006 Yamaha 1100 that is backfiring in the carburetor. Do you lot have any thought why?

Respond: I don't know much about bikes, merely have y'all played with the air injection arrangement? Try to disable it and see if it stops the backlash. Y'all may need to take it serviced.

Question: I have a 1979, gas powered, Datsun pickup. Just completely rewired, carburetor jets, etc. cleaned 6 months agone. Fuel filter & fuel pump ok. Timing chain, chain tensioner, rings & valves replaced three years ago. Distributor cap looks OK & coil is only a few weeks old. The truck ran fine, until I striking a 2' deep pothole, and information technology merely died. Won't get-go, & backfires during the starting procedure. What is the cause of the trouble?

Reply: Information technology's possible the starter or role of the excursion got damaged. Possibly the carburetor volition need aligning besides.

Question: I have a 1975 Chevy Camaro with a 350 in it. My distributor was loose as hell which causes the car to catch on fire but I replaced all of the things that caught on fire and timed it more than than in one case(carb, gaskets, distributor cap, and spark plug wires) and it's notwithstanding backfiring. I got brand new spark plugs. What would too be the cause of the backfiring?

Answer: Endeavor setting the timing by ear, probably the marks don't sync, and make sure the benefactor doesn't movement from side to side.

Question: What are the causes of backfiring that just happens when running on LPG?

Respond: Double-cheque the timing. Also, the system may be leaning out. Information technology may come from a vacuum leak (gasket, etc), leaking injector.

Question: My Toyota Quantum engine backfires when starting it. What could be the problem?

Answer: Bank check the ignition timing, information technology may be too retarded. Also, check the ignition organization. If yous haven't washed nonetheless, try downloading trouble codes. A pending code may guide you here.

Question: I have a 2003 Chevy Venture that backfires through the air filter housing on acceleration. What is the problem?

Answer: One of the common bug is a faulty fuel system. Get-go, brand certain you lot have replaced the fuel filter at the proper schedule. You may demand to check fuel pressure. This other post may help:

https://axleaddict.com/auto-repair/How-to-Examination-a-F...

Cheque the MAF sensor besides. And download possible trouble codes, even if the check engine light is not on.

Question: My 98 Honda d16 backfires and misses at operating temperature. Do you take any suggestions as too why?

Answer: Check the ignition module. If you lot don't have the specs, probably you can have it to an auto parts store. Some will check it without toll.

Question: 1975 BMW 2002 backfires at idle or when coasting. Possible causes?

Respond: An exhaust valve sticking open may be causing the backfire, or possibly an exhaust leak. Besides cheque the carburetor mixture adjustments.

Question: My car is a Nissan Almera. If I attempt to offset information technology, instead of starting, information technology backfires and doesn't start. What could exist the problem?

Answer: Check the timing belt, ignition timing and fuel force per unit area.

Question: My 1997 Mazda 626 DX 2.0, automatic, 4 cylinder has been backfiring and won't get-go. Since Nov 1st, I have changed the battery, negative cable, starter motor, ignition coil, coolant temperature sensor, spark plugs, wires, and other components. As of February 14th, it was running good. But when I went to a friend'south and began to leave, information technology was backfiring and wouldn't start. Advice?

Answer: Try checking for problem codes, fifty-fifty if the engine light is non On. Also, attempt disconnecting the exhaust pipe a footling bit so that information technology tin can jiff and try starting the engine. If it starts, the catalytic converter is chock-full. Hope this helps.

Question: I have a 2001 Cherokee Sport Straight 6. We put in a used jasper motor and now later a few minutes when the engine starts to warm upwards, the engine starts to rev up to 2000

RPMs. About 30 defends after that y'all hear the popping from the gas exploding. Too many backyard mechanics with besides many choices. I've heard computer or maybe IAC VALVE. Practise you accept any ideas?

Answer: Check the ignition organisation, connections and modules.

Question: I have a 1998 Chevy K1500.with a regular frazzle backfire. It has new aluminum distributor assembly, plugs, and wires. In trying to isolate which cylinder the event is involved, the backlash disappears with the plug wire removed from the number 2 or four cylinder. Firing order is i-8-4-iii-half dozen-5-7-2. Does this data point to any particular crusade for the backfire condition?

Respond: Assuming the new plugs are properly gapped and new wires are good, and backfire wasn't there prior to installing the new parts, I'd be suspicious of the wires' routing.

In your firing sequence, 8 or 7 cylinder wires could exist affecting iv or 2, if they are running parallel to each other. Usually, they should cross. Endeavor pulling these wires autonomously with the engine idling and come across if this makes any difference. As well, endeavor swapping wires and see if this changes the cylinder backfiring.

Question: I accept a 327 sbc Edelbrock tunnel ram carb. Information technology backfires when I start, then runs OK. What could be causing my engine to backfire?

Reply: Check timing; check for a possible gasket leak, carburetor, and/or intake; make sure the choke is properly adapted.

Question: My 2022 Chevy Malibu is making a whining dissonance coming from the front of the auto. It goes away at a higher speed in a higher place 40mph and up. Transmission shifts well. I took it to some mechanics. They told me the belt tensioner, and another told me information technology was the alternator. What could it be?

Answer: It is possible the tensioner, or the alternator is the cause of the noise. But the problem tin can also exist a belt misalignment or worn bearing. You can momentarily disconnect the chugalug and start the engine and meet if the noise goes away. If it does, rotate the different pulleys by mitt and see if you can detect a bad or worn bearing from i of the accessories or tensioner the belt runs on.

Question: I accept a 1997 Jeep Grand Cherokee. Information technology the truck cuts off while driving, and then starts again, it also backfires sometimes. The check engine light came on then went out and back on. The MAP sensor has been inverse. What could be wrong?

Reply: It seems fuel book gets also lean and cuts off the engine. This volition brand sense, if the engine starts and backfires. You lot might want to test fuel pressure. However, pay attention to the problem code(s) and test any function/system indicated by the code.

Question: I have a 91 Chevy suburban with the 5.7 L. I'm having bug with backfiring after the truck has warmed upwardly. It volition start while accelerating and volition not permit yous button the gas without backfiring. I but replaced the fuel filter. And the charcoal can has water in it. What do I exercise next?

Reply: Bank check to see if there are any trouble codes in retentivity, probably awaiting codes. The canister, make sure it is h2o in information technology. Probably you'll need to replace it. If it is fuel, mayhap a problem with the emission organisation. Check fuel pressure. A lean mixture is peradventure causing the backfire. This is normally due to a worn out fuel pump or a bad pressure regulator. Also, check the MAF (bad or dirty).

Question: I have a 93 Prelude. I recently did the oil alter and spark plugs. After I did that, the car backfires and smokes for a couple seconds then stops? What can cause this?

Answer: Make sure the spark plug wires are properly connected, and in the firing society. Check the distributor cap for carbon traces or cracks and examination the ignition coil.

Question: I have a 2004 Mazda 6 2.3lL that once it gets into normal temperature, the auto RPM drops to most 500 and it just idles crude. It also backfires and it's not drivable. Once information technology cools down, information technology works and runs fine. But in one case I leave, cease in idle, information technology starts doing information technology over again. What could cause my Mazda to overheat and fail to drive and does it relate to its having a code P0300 misfire?

Answer: In that location could be a problem with the idle air control (IAC) valve (carbon buildup or faulty device); check also the PCV valve (gluey valve) and a possible bad charcoal canister valve every bit well. Whatever of these faults may be causing the misfire. Hope this helps.

https://axleaddict.com/motorcar-repair/IAC-Motor-Troub...

Question: I have a 1994 Toyota pickup 2.4 22RE, and it won't start, it backfires through the intake. The fuel pump is working, what else could it be?

Answer: Check EGR valve performance; brand sure the valves are opening and closing properly.

Question: For my 1997 Grand Cherokee, can a backlash exist caused by a clogged catalytic converter?

Answer: A bad catalytic converter that fails to fire fuel that finds its way back there tin can lead to backfires.

Question: I have a 1996 Dodge Dakota 4 cylinder two.five. When Information technology offset cranks it's fine, simply when it gets hot, the only fashion it volition drive is with the throttle pressed all the manner. If y'all press the throttle halfway similar cruising speed it acts like information technology'southward dying till you press the throttle all the mode. It will get but backfires. And so it has a crude Idle and red lights. What could be the problem?

Answer: It seems like a faulty sensor's curl. A bad coil won't begin to neglect until information technology reaches operating temperature. One time it cools, it works fine. This kind of problem is caused by a bad ignition whorl, fuel pump, crankshaft or camshaft position sensor. Download trouble codes in instance the computer has a awaiting problem lawmaking stored. This may help pinpoint the faulty sensor. Check the throttle position sensor for dead spots besides.

Question: Toyota with 1AZ engine starts nicely but when gear loaded it backfire only when the engine is cold and when information technology warms its OK. What could be the trouble?

Answer: Check the ignition timing and the EGR valve. Also, scan the reckoner for pending codes, if necessary, even if your cheque engine light is not on.

Question: I take a 1994 GMC k1500 5.7 when Information technology is cold outside and I kickoff it backfires out the exhaust and the RPMs become upward when started then started jumping around. Have changed tops,ect, tested map sensor as well changed Inc valve and ignition coil vacuum reads fine so no leaks there. Not sure where to look from hither do you lot have any suggestions?

Answer: Seems the engine is sucking also much air -- too little fuel. The mixture is too lean. The common cold temperature doesn't help to burn the fuel at startup. Then it ignites in the exhaust. At that place could be a problem with the air-injection organization, a pump or valve perhaps.

Question: I have a 1999 Jeep Yard Cherokee, I replaced the fuel filter just now the backfiring is worse, what should I practise?

Answer: The problem could be in the fuel organisation. Faulty fuel injector, fuel pressure regulator, pump, may cause the mixture to lean. Outset by checking the injectors and fuel pressure:

https://axleaddict.com/auto-repair/How-to-Test-Fue...

https://axleaddict.com/motorcar-repair/How-to-Examination-a-F...

Hope this helps.

Question: I have a 2006 Chevy HHR. I got it for a practiced bargain considering someone had ripped some wiring out under the dash, and the fundamental was broken in the ignition. I repaired the wiring and got another cardinal simply all it will exercise is backlash. It won't start. Exercise you know why information technology might exist doing this?

Reply: If there are no DTCs, bank check the whole ignition system. Other possibilities are the fuel and exhaust systems.