Engine Misfire - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 09-09-2007, 10:17 AM Thread Starter
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Engine Misfire

Couple of weeks ago my check engine light came on and the car ran rough right after start up, i turned the car off for about a minute and started it up again and it ran fine. I brought it in the dealership and they said there was a misfire on cylinders 1, 2, 3, and 5 but couldn't find anything wrong. They checked each spark plug and wire but no problems. They continued to clean the engine and connections but found nothing wrong. Now recently it did it again ran horrible right after start up but I turned it off and back on and runs fine again. The car has 56000 miles on it and is bone stock.

Any ideas?

Andrew
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post #2 of 14 (permalink) Old 09-09-2007, 10:36 AM
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After it ran rough at idle, does it run fine at higher RPM while driving?
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post #3 of 14 (permalink) Old 09-09-2007, 12:20 PM
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My guess is, that MAF is going bad.
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post #4 of 14 (permalink) Old 09-09-2007, 03:01 PM Thread Starter
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when it ran rough it would barely go at all, and feel like only two cylndars were running. Both times it happened i drove it about 100 feet before stopping and turning it off and back on and then it runs fine.

when it was running rough the check engine light would blink and now it is constant. I just don't want to bring it in again and spend a couple of hundred dollars for them to say that nothing is wrong

Andrew
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post #5 of 14 (permalink) Old 09-09-2007, 05:49 PM
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If the car would not go at all, there are a few things that could be wrong, MAF, oxygen sensor or low fuel pressure. In the case that it runs fine sometime, high likelihood will be the MAF since it is the most complex.

If the check engine light is on, the ECU had registered some error code already. So the shop should be able to identify what it is.
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post #6 of 14 (permalink) Old 09-09-2007, 06:43 PM
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MAF OXYGEN SENSOR are not the issue if the shop couldnt find trouble codes. they set them every time due them being emmissions related. i would say you got bad gas, or your running less the mid grade. alot of people deny using reg but with prices now adays ill put mony on, your using reg. this will cause misfires in cylinders with out setting other codes. and its very hard to detect because the engine will only misfire somethimes. veryhard to diagnose and usually 90% of the problem. be honest you put reg in it didnt you
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post #7 of 14 (permalink) Old 09-09-2007, 07:20 PM
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Depending on your mileage, it might be time to change the plugs and wires. It would also be the MAF. At least remove it and clean it with CRC MAF cleaner.

I assume the only codes you got were P0300, P0301, P0302, P0303, and P0305. If P0170 and P0173 came up, it points to the MAF.

Do you have dual catalytic converters?

Mike
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post #8 of 14 (permalink) Old 09-10-2007, 06:40 AM Thread Starter
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I have never put less than 92 gas in the car, and the car has 56000 miles on the spark plugs look good and if i turn the car off and back on again it runs fine.

the trouble codes that i recieve are that a couple of cylindars misfired, each time it says different cylindars misfired

Thanks for everybodies help

Andrew
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post #9 of 14 (permalink) Old 09-10-2007, 09:03 AM
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One possibility is the EGR valve is stuck open. EGR is not normally used at low speed and at wide open throttle.
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post #10 of 14 (permalink) Old 09-10-2007, 05:55 PM
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the egr wouldnt rest with the ignition. plus it would set a low flow code. did the car surge? did you take it to a mb dealer? if so did they provide adaptation data for the mass air flow meter? that would tell you if its the sensor before it throws the code. even if its the mass air flow meter, you still need to take it back to the dealer to rest adaptation data to 0. if yyou dont the computer will be reading good info for air flow but will still be dumping extra gas untill it readapts to the new maf sensor. causing poor fuel econ and ruining your spark plugs. there are alot of people that would disagree but take it from me i have seen it first hand people taking advice from do it your selfers and spending more mony in the long run.
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