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Old 08-02-2012, 11:19 PM   #1
Five_seveN
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does a misfire create a service engine or CEL?

sounds like my car has a misfire but the only light on is service engine soon. is this related to the misfire or would there be a CEL as well?
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Old 08-02-2012, 11:29 PM   #2
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Misfires would give you a SES light. In other words, a check engine light.
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Old 08-03-2012, 12:09 AM   #3
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Usually a when a misfire is detected the code is stored and SES/CEL light will be ON.
In case of continuos misfires(while you are driving) the CEL should blink with each misfire, accompanied with jerks from the engine and rpm dips. At least that is the case with most OBD II cars, not sure if e46 SES behaves in the same way.
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Old 08-03-2012, 05:40 AM   #4
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

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Old 08-04-2012, 12:57 PM   #5
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I'm having the same issue with my m3
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Old 08-29-2012, 05:25 PM   #6
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code P01/(71)74: fuel trim bank one and two condition

ECM has detected a rich or learn air/fuel ratio condition on engine banks one and two

ive already had misfires fixed three times. sometimes itll misfire as soon as i start then be okay as i drive
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Old 08-29-2012, 05:48 PM   #7
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Plug your codes into advanced/title search.

Many causes...like broken intake boot, leaking disa, bad/dirty maf, dirty injectors (use techron), dirty air filter.

Start with the basics...get a look down at TB and just replace the lower boot for $12 assuming you haven't...and do the rest of the stuff on that trip to TB as you can. Search me and Tampa Bay in some thread somewhere.

GL...hth

There's only the Check Engine Light (looks like an engine)...means you can drive but get it looked at and do something about it. Often CEL is emissions related...could be another vac hose broken. See jfoj's sig for a good thread on misfires, etc.
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Old 08-30-2012, 04:31 PM   #8
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Quote:
Originally Posted by dmax View Post
Plug your codes into advanced/title search.

Many causes...like broken intake boot, leaking disa, bad/dirty maf, dirty injectors (use techron), dirty air filter.

Start with the basics...get a look down at TB and just replace the lower boot for $12 assuming you haven't...and do the rest of the stuff on that trip to TB as you can. Search me and Tampa Bay in some thread somewhere.

GL...hth

There's only the Check Engine Light (looks like an engine)...means you can drive but get it looked at and do something about it. Often CEL is emissions related...could be another vac hose broken. See jfoj's sig for a good thread on misfires, etc.
all of that was replaced sometime last year. i think the only thing left to check are the injectors. is there any significant damage that could be done if i let it run lean for awhile? this is taking a long time to fix
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Old 08-30-2012, 05:21 PM   #9
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Originally Posted by Five_seveN View Post
sounds like my car has a misfire but the only light on is service engine soon. is this related to the misfire or would there be a CEL as well?
SERVICE ENGINE SOON is the Check Engine Light.

For some moronic reason, automakers have a choice to use service engine soon, check engine, or a picture of the engine with or without the word CHECK under it.

This is a place where the specification should dictate precisely what must be used, and there should be no options just for the reason you bring to the table -- your car is calling for yo uto Check Engine, but the message does not say that.
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Old 08-30-2012, 05:30 PM   #10
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Originally Posted by Five_seveN View Post
code P01/(71)74: fuel trim bank one and two condition

ECM has detected a rich or learn air/fuel ratio condition on engine banks one and two

ive already had misfires fixed three times. sometimes itll misfire as soon as i start then be okay as i drive
P0171 & P0174 mean the Fuel Trim is LEAN. Lean can be caused by -- is almost always caused by -- a vacuum leak.

The intake air passes through the MAF, where it is analyzed for air density and temp -- warm air is thin, cold air is dense -- and the computer uses the information to set the fuel delivery (injector) timing. When the air is cold and dense, there must be more fuel delivered, if the air is warm and thin, then less fuel is needed. The goal is to keep the air/fuel ratio at 14.7:1 (14.7 parts of air for each part of fuel). If there is an intake leak, then extra air will enter the intake system that is not metered by the MAF, the result is the fuel delivery might not be sufficient -- it will not be sufficient in almost every case -- and the resulting mixture will be lean, giving the codes you got. P0171 is for Bank 1, P0174 is for Bank 2.
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Old 08-30-2012, 07:36 PM   #11
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Quote:
Originally Posted by jdstrickland View Post
P0171 & P0174 mean the Fuel Trim is LEAN. Lean can be caused by -- is almost always caused by -- a vacuum leak.

The intake air passes through the MAF, where it is analyzed for air density and temp -- warm air is thin, cold air is dense -- and the computer uses the information to set the fuel delivery (injector) timing. When the air is cold and dense, there must be more fuel delivered, if the air is warm and thin, then less fuel is needed. The goal is to keep the air/fuel ratio at 14.7:1 (14.7 parts of air for each part of fuel). If there is an intake leak, then extra air will enter the intake system that is not metered by the MAF, the result is the fuel delivery might not be sufficient -- it will not be sufficient in almost every case -- and the resulting mixture will be lean, giving the codes you got. P0171 is for Bank 1, P0174 is for Bank 2.
thanks. that narrows down what i should be looking at
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Old 08-30-2012, 07:49 PM   #12
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all of that was replaced sometime last year. i think the only thing left to check are the injectors. is there any significant damage that could be done if i let it run lean for awhile? this is taking a long time to fix
Letting it run lean or rich isn't good. Significant damage? Probably not if you get to it within a reasonable time, but not good long term.

Injectors are probably the last thing you want to check, though. You're getting misfires in all cylinders...all injectors wouldn't go bad together unless the computer was really messed up...neither really happens much.

Lean condition is, as JD said, often air leak...if not lower boot (you said that was done), then many vac hoses around...look under cabin air filter housing...read jfoj's sig... do some looking around with led flashlight and inspection mirror.
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