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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Jul-11-2017, 11:01:30 PM   #1
Shkreli7
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Default 1997 e36 m3 misfire help

I recently purchased a 1997 m3 with around 63k miles on the car and it misfires in cylinder 6 and sometimes cylinder 5. When the car is cold it doesn't misfire but when it gets warmed up it starts misfiring. Also when I'm driving the car it doesn't misfire only at idle. I have swapped out the spark plugs, coils, injectors, cleaned the idle control valve, checked for any vac leaks, swapped out the man from a working 97 m3, did a compression test and all cylinders were good. Im wondering if I'm missing anything else before I rip up the engine and check the head.

P.S the car was sitting for around 6 years, the owner said he replaced the fuel pump and filter but maybe he could have made that up. I might check to see if the car is getting enough fuel this weekend. If anyone else has some other ideas that I haven't tried please let me know. I really doubt that its the head because it doesn't show any symptoms but maybe a bent valve? Maybe camshaft position sensor?

Let me know what you guys think, thanks.
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Old Wed, Jul-12-2017, 01:50:14 AM   #2
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Default Re: 1997 e36 m3 misfire help

Did you try cleaning the MAF sensor?
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Old Wed, Jul-12-2017, 02:15:49 AM   #3
Shkreli7
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Default Re: 1997 e36 m3 misfire help

Yea cleaned it and still same problem. Swapped in another one, it was running great for 10 minutes than the problem came back.
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Old Wed, Jul-12-2017, 05:11:00 AM   #4
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Default Re: 1997 e36 m3 misfire help

Sure its not a vac leak? sounds very likely. did you do a smoke test?
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Old Wed, Jul-12-2017, 06:14:39 AM   #5
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Default Re: 1997 e36 m3 misfire help

I doubt fuel delivery will be the issue at idle. Especially since it runs fine at higher rpms.

However, it can be your active carbon filter. Try cleaning that. Maybe its clogged.
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Old Wed, Jul-12-2017, 02:00:29 PM   #6
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Default Re: 1997 e36 m3 misfire help

How are your grounds and ignition harness? Heat builds resistance so look there too. Swap 02 sensors

Also can you see your fuel trims adaptations? Have you scanned for any stored codes?
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Old Wed, Jul-12-2017, 05:55:03 PM   #7
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Default Re: 1997 e36 m3 misfire help

if it only misses when warm I would check sensors
coolant temp sensor to DME or o2 sensors? your obd2 so I'm surprised you don't get codes but if it's 5 and 6 maybe knock sensor?

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Old Wed, Jul-12-2017, 06:32:34 PM   #8
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Default Re: 1997 e36 m3 misfire help

The only codes I get are the misfire 6, misfire 5 sometimes. And sometime a maf code will pop up or a o2 sensor code but both the o2 sensors and maf have been changed.
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Old Wed, Jul-12-2017, 07:57:02 PM   #9
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Default Re: 1997 e36 m3 misfire help

so you haven't had a smoke test yet right? if it's spitting out those codes and you've replaced what you mentioned I would smoke test it or atleast check all hoses by the boot and intake manifold
there are some small hoses underneath the manifold as well

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Old Thu, Aug-03-2017, 02:22:28 AM   #10
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Default Re: 1997 e36 m3 misfire help

Quote:
Originally Posted by Shkreli7 View Post
I recently purchased a 1997 m3 with around 63k miles on the car and it misfires in cylinder 6 and sometimes cylinder 5. When the car is cold it doesn't misfire but when it gets warmed up it starts misfiring. Also when I'm driving the car it doesn't misfire only at idle. I have swapped out the spark plugs, coils, injectors, cleaned the idle control valve, checked for any vac leaks, swapped out the man from a working 97 m3, did a compression test and all cylinders were good. Im wondering if I'm missing anything else before I rip up the engine and check the head.

P.S the car was sitting for around 6 years, the owner said he replaced the fuel pump and filter but maybe he could have made that up. I might check to see if the car is getting enough fuel this weekend. If anyone else has some other ideas that I haven't tried please let me know. I really doubt that its the head because it doesn't show any symptoms but maybe a bent valve? Maybe camshaft position sensor?

Let me know what you guys think, thanks.
If you've done all that work already and tuned it up and replaced All Those sensors you mentioned above I would definitely replace the throttle position sensor TPS sensor that sounds like your main issue right there as far as the idling goes or it could be a bad ECU and mostly if this is a swapped out motor and you didn't swap out the correct ECU to go with it you'll definitely have misfiring issues I would consider getting the right ECU and that should help solve the problem.
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Discussing 1997 e36 m3 misfire help in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)