Question about 1997 Mercedes-Benz C-Class

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Missing and backfiring.

Engine is missing and backfiring, especially at low revs and under load or when idling. What could be the cause of this? Mechanics cannot find cause. The airflow meter and suppressors have been replaced but this made no difference. Wiring has been checked and is OK.

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Have him check the egr system

Posted on May 10, 2010

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1 Answer

Back firing under a load. what the valve setting on the intake and exhaust.


there is detail missing here that is essential for a solution
what engine is it , v or straight, no of cylinders
what work has been done prior to the problem
what ,make and model, year of vehicle
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They will start and idle ok but backfire under load

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Car engine idles really high then really low, why?


It can be issue with IAC( idle air control valve) causing the problem.


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There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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These details will help.

Thanks.

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1 Answer

Engine missing mainly between 45 and 55 mph


I'm going to assume you have the 3.4 V6 engine which uses direct ignition with a coil on each plug.
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A weak spark/coil will allow the engine to run on all 6 cylinders at idle but miss under load, especially when going into overdrive at 45 mph. Not enough spark to jump the gap.
Same thing with low fuel pressure or dirty injectors. Not enough fuel when the engine is working hard.
Usually when you get a hard miss you will get a trouble code for the cylinder that is not giving power.
Have you changed the fuel filter in the past 12 months ?

Jan 22, 2013 | 1997 Toyota 4Runner

1 Answer

My jeep is missing when idling and rev it and revs comes down slowly and missing just above 1000 rev and then falls to normal rev.what could be wrong?


If the engine has a constant miss the computer should record a trouble code or two.
Is the check engine light on ?

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1 Answer

My 2001 chevy blazer is misfiring and will not rev beyond 2000rpm without cutting out but it idles alright


trying to rev the engine in neutral will not work. the computer will limit the rpms.it is kind of a goofy safety measure built into the system. to diagnos the missfire you can remove one plug wire at a time with an insulated pliers.the missfireing one will -not-slow down the engine speed. if all cylinder are firing properly at idle and only misfires under load you will probably need some help have a driver put on the brake and accelerate a little untill it misses. when you have verifyed this try the same thing with the plug wires while it is missing. do not keep the engine torqed this way for more thn a couple of seconds. you could damage the trans.. when you locate the missing cylinder you will need to find out why it is missing. look at the spark plug,and maybe swap one plug wire for another to see if the missfire moves to another cylinder. i am assuming you have no test equipment. if that does not change,see if you can get at that injector for that cylinder and lightly tap on it with a metal punch.if problem seems to go away or engine misses when tapping injector it will need to be replaced.

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1 Answer

Rough idle, backfire on acceleration


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1 Answer

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check for spark at the coils under load. May have to change some ignition coils.

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