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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, May-13-2018, 09:00:41 PM   #1
Motom
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Unhappy Help: Low Compression in 4 & 5

I was cursing along the highway and my 1998 M3 started misfiring really badly. It felt like it had half the power it normally has. I checked the codes, and it said cylinder 5 misfire and cylinder 4 misfire pending.

I drove a 2km to the nearest auto parts store to try to diagnose the problem.

I tried swapping the plugs and the coils and still got a misfire in cylinder 5. The plugs from 4 and 5 looked a little wet, and when i looked into the cylinders, there was more build up on the pistons. I then compression tested the car and I got the following (cold):
185
185
190
90
85
185

When testing 4 & 5 you can hear a hissing which seems to come from the other cylinder. When testing cylinder 5, there was oil residue on the compression tester after taking it out. There is a little bit of smoke coming out of the car when it is running.

The car has 245,000km on it. I don't know if that is relevant, but I figured i should include it.

My guess after doing a bit of research online is that the head gasket broke between cylinder 4 & 5, but I'm not sure.

1. What do you guys think that the issue is?
2. Would a leak down test be able to tell me that its the head gasket?
3. Are there other tests that I should do to help diagnose the issue?
4. I also read that some people re-seal their rings by pouring injector cleaner down the cylinder and letting that sit overnight. After that they blow it out and let the car idle to clear everything out. I don’t think thats my issue, but its easy to do. Is there any harm to doing this?

Thanks,
Michael
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Old Sun, May-13-2018, 09:04:48 PM   #2
McGyversM3
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Default Help: Low Compression in 4 & 5

Quote:
Originally Posted by Motom View Post
I was cursing along the highway and my 1998 M3 started misfiring really badly. It felt like it had half the power it normally has. I checked the codes, and it said cylinder 5 misfire and cylinder 4 misfire pending.

I drove a 2km to the nearest auto parts store to try to diagnose the problem.

I tried swapping the plugs and the coils and still got a misfire in cylinder 5. The plugs from 4 and 5 looked a little wet, and when i looked into the cylinders, there was more build up on the pistons. I then compression tested the car and I got the following (cold):
185
185
190
90
85
185

When testing 4 & 5 you can hear a hissing which seems to come from the other cylinder. When testing cylinder 5, there was oil residue on the compression tester after taking it out. There is a little bit of smoke coming out of the car when it is running.

The car has 245,000km on it. I don't know if that is relevant, but I figured i should include it.

My guess after doing a bit of research online is that the head gasket broke between cylinder 4 & 5, but I'm not sure.

1. What do you guys think that the issue is?
2. Would a leak down test be able to tell me that its the head gasket?
3. Are there other tests that I should do to help diagnose the issue?
4. I also read that some people re-seal their rings by pouring injector cleaner down the cylinder and letting that sit overnight. After that they blow it out and let the car idle to clear everything out. I donít think thats my issue, but its easy to do. Is there any harm to doing this?

Thanks,
Michael


Definitely sounds like the head gasket had the same issue between 1&2



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Last edited by McGyversM3; Mon, May-14-2018 at 04:16:02 AM.
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Old Sun, May-13-2018, 10:15:16 PM   #3
westopher
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Default Re: Help: Low Compression in 4 & 5

I had the same happen between 5 and 6. Time to pull the head.
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Old Mon, May-14-2018, 02:07:26 AM   #4
Ajcanadian
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Default Re: Help: Low Compression in 4 & 5

Same with me on 4&5. Pull the head and do the headgasket make sure you get the elring gasket
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Old Mon, May-14-2018, 07:54:47 PM   #5
Motom
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Default Re: Help: Low Compression in 4 & 5

Looks like I'm going to have to take it apart...

Did you guys get your head machined when you did it? And did you take the cams out?
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Old Mon, May-14-2018, 08:24:32 PM   #6
JitteryJoe
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Default Re: Help: Low Compression in 4 & 5

Quote:
Originally Posted by Motom View Post
Looks like I'm going to have to take it apart...

Did you guys get your head machined when you did it? And did you take the cams out?
Depends on how deep you want to go. At 150K miles I'd be very tempted to have the head gone through, "while you're in there" (that phrase tends to be expensive).
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Old Mon, May-14-2018, 08:46:39 PM   #7
j0rdan J
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Default Re: Help: Low Compression in 4 & 5

At the very least get it machined, pressure tested and some new valve stem seals. Will probably need the valve seats to be grind down a bit as well, but it shouldn't run you more than a few hundred dollars.
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Old Tue, May-15-2018, 01:20:14 AM   #8
Motom
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Default Re: Help: Low Compression in 4 & 5

A few hundred dollars doesnt sound that bad, I'll start looking into it and see if i can find some local shops willing to do the job.

Outside of that, I can already see the "while you're in there" argument getting very expensive, so I'm trying to keep that to a minimum.
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Discussing Help: Low Compression in 4 & 5 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)