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E34 (1989 - 1995)

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  #1  
Old 07-06-2016, 08:35 AM
mgkbull mgkbull is offline
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Mein Auto: '95 BMW 525i
Exhaust smoke when driving.

So obviously it's an exhaust leak, I'm just trying to pinpoint it.

A couple of weeks ago I had to drop my exhaust to get to the O2 sensor. This is because I had stripped the O2 sensor nut so needed better access to it.

Anyway I had unbolted my exhaust manifold but never got it off all the way and ended up just rebolting it back on after cutting the sensor in half and using a standard 22mm socket on it. In doing so could I have messed something up? I made sure all bolts were screwed in to factory specs, but I'm thinking there is a leak now. Only happens when everything is nice and hot after driving for about 15 minutes. Did I break the seal for the exhaust manifold gasket?
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  #2  
Old 07-06-2016, 02:36 PM
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thumper600 thumper600 is offline
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Mein Auto: '95 540i M-Sport, 01 M5
So are you saying there is actual smoke emanating form the exhaust pipe or are you saying you smell the exhaust in the cabin when driving?
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Old 07-06-2016, 02:44 PM
mgkbull mgkbull is offline
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Quote:
Originally Posted by thumper600 View Post
So are you saying there is actual smoke emanating form the exhaust pipe or are you saying you smell the exhaust in the cabin when driving?
I smell the exhaust when I come to a stop. Can't pinpoint where it's coming from. I could see it this morning too and it was quite a bit. But when I pulled over and opened the hood, I could no longer see it. I even hit the throttle body cable and still couldn't see it.

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Old 07-09-2016, 03:52 AM
ThoreauHD ThoreauHD is offline
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Mein Auto: 02/1994 530i 8cylinder
Exhaust smoke when driving.

So you cracked open the exhaust manifold, but didn't replace the gasket, but did torque it at a dangling angle so you could access a O2 sensor.

Well.. yea, I'd say there's a slight possibility that your O2 sensor isn't sealed/threaded properly and a very very damned near certain high possibility that you F'd up the gasket when you torqued the sht out of it. So yea, I vote new gasket. They run between $5 & $15 so it shouldnt break the bank. Easy and fun job. Be sure to clean and smooth the surface before installing a new gasket.

Last edited by ThoreauHD; 07-09-2016 at 03:55 AM.
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  #5  
Old 07-20-2016, 11:10 AM
mgkbull mgkbull is offline
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Mein Auto: '95 BMW 525i
OK, so I'm going to replace the exhaust manifold gaskets. My problem is though, the first time I tried to get them off it didn't come off all the way, because a metal plate covering the control arm below the downpipes prevented me from taking it off all the way. I could never get them more than an inch off away from bolt posts. Is there a better way to do this?
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