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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 Sun, Jul-02-2017, 06:20:33 PM   #1
iceboss23
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Default Misfires and noisy valve train

I have a 97 5 spd that has had issues with reduced power at higher throttle, occasional misfire codes, and a noisy valve train as well as needing a good amount of gas to avoid stalling first thing in the morning.

I took it to a mechanic (unfortunately after clearing the codes which he could not get it to reproduce) and, after testing and replacing some damaged vacuum lines that were not the issue, he said the cam followers and bridges are worn and binding and I should replace them to the tune of $2500. I have pulled both intake and exhaust out myself and they all appear to be in great shape.

So the question is: could these parts be worn subtly enough for me not to see or feel any issue but still be causing a problem or is the problem somewhere else?

Any thoughts, suggestions, experiences, links to other threads, DIY's, videos welcome and appreciated.
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Old Mon, Jul-03-2017, 08:41:24 AM   #2
Hasan Shaikh
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Default Re: Misfires and noisy valve train

How is your fuel pressure? My guess is you have a problem with fuel delivery.
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Old Mon, Jul-03-2017, 12:48:19 PM   #3
pbonsalb
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Default Re: Misfires and noisy valve train

I agree with guessing something other than worn lifters or cams though I suppose that is a remote possibility. I'd look into fuel or ignition or wiring harness issues. 97 is obd2 so I would start by reading codes. These cars are 20 years old and some have been neglected and need sorting out.
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Old Mon, Jul-03-2017, 01:43:56 PM   #4
vmbray
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Default Re: Misfires and noisy valve train

You may have multiple issues at the same time, my car did when I got it. My experience was the idle got better and better as I fixed things.

Have the normal maintenance issues been sorted out? Extra gas at idle could be sticky icv. Plugs been changed? Plug boots? Swap coils around to see if the misfire codes move around too. Vanos can cause idle issues. Check the intake boot for tears that let un-metered air in.

Fuel filter is a good idea. In general agree that lifters etc would be the last thing to get into after all the basic maint is sorted. Noisy valve train I'm not sure but you can overfill the oil by a quart and see if it gets better. What oil are you running? Try the Rotella T6 if you haven't.
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Old Mon, Jul-03-2017, 04:41:22 PM   #5
pbonsalb
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Default Re: Misfires and noisy valve train

And the noisy valvetrain could be just a rattling vanos, which is not the end of the world -- its $70 in parts to fix if you DIY. Vanos is supposed to be advanced at idle and then retard just off idle to about 5000 rpm, when it retards again. Its failed position is retarded, and people who experience it say their car is down on power in the low to midrange and then takes off on the top end (it is actually no faster on the top end but feels faster since the bottom end is weaker). I am not sure what effect the lack of advance at idle speed has on the idle. I think the suggestion above that there could be an IAC problem or a vacuum leak is the better explanation for a bad idle.
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Old Mon, Jul-03-2017, 04:48:09 PM   #6
iceboss23
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Default Re: Misfires and noisy valve train

Quote:
Originally Posted by Hasan Shaikh View Post
How is your fuel pressure? My guess is you have a problem with fuel delivery.
How do I check the pressure?
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Old Mon, Jul-03-2017, 05:20:19 PM   #7
iceboss23
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Default Re: Misfires and noisy valve train

Quote:
Originally Posted by pbonsalb View Post
And the noisy valvetrain could be just a rattling vanos, which is not the end of the world -- its $70 in parts to fix if you DIY. Vanos is supposed to be advanced at idle and then retard just off idle to about 5000 rpm, when it retards again. Its failed position is retarded, and people who experience it say their car is down on power in the low to midrange and then takes off on the top end (it is actually no faster on the top end but feels faster since the bottom end is weaker). I am not sure what effect the lack of advance at idle speed has on the idle. I think the suggestion above that there could be an IAC problem or a vacuum leak is the better explanation for a bad idle.
ok I've got it all apart. What specifically would you replace?
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Old Mon, Jul-03-2017, 10:27:37 PM   #8
pbonsalb
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Default Re: Misfires and noisy valve train

The top 2 items here, the orings and anti rattle thick washer.

http://www.beisansystems.com/products.html

You will also find instructions at that website.

As for other stuff, I would inspect and test before replacing. Inspect wiring, like cam position sensor, knock sensor. Clean oil out of ICV. Inspect ICV hoses and throttle body inlet boot and fuel pressure regulator vacuum line.

Last edited by pbonsalb; Mon, Jul-03-2017 at 10:30:54 PM.
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Discussing Misfires and noisy valve train 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)