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Old 06-26-2014, 08:20 AM   #16
Ceeker
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Quote:
Originally Posted by Slowered318 View Post
I had it running pretty good last year, the BMW gods shone some light on me. This summer is ticking, rattles and a strange loss of HP. 13 years and a couple thousand dollars has taught me the M42 is relentless with issues.
that is untrue..the M42 is an excellent motor when treated properly. The one theory I have is that oil level must be kept up. because the motor loves to rev high starvation can occur at the top end. And this is where the problems begin. the upper chain guides start to wear and this is where the rattling starts followed by the chain wear and stretching.

I had one that didn't have top end problems but after some 300k the hydrolic timing belt tensioner went and rear crank bearing did also. The only problem with the motor was the front profile gasket which bmw denied is a design flaw.

The rear bearing has a race which through hard down shifting loads up and the crank wears down this race causing slap. the upper side has the race but the lower side doesn't. Bearing companies now make it with both. Again a design flaw. After correcting these issues the motor didn't give me any problems.

Maybe a few hundred bucks in parts and time.

if you compare this to the M20...let the timing belt water pump service lapse and see what happens. in the day....that would have been a 3k job to get the head rebuilt or replaced.

all relative. :-)
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Old 06-26-2014, 10:27 AM   #17
InfiniteDice
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Disconnect the O2 sensor. Drive it for a while and see. I had a short in the O2 sensor wire before, basically was drowning itself out coming off the highway.
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Old 06-26-2014, 12:22 PM   #18
bimmere30
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Originally Posted by Ceeker View Post
well, it looks like its gonna be process of elimination. start swapping out parts. remember, certain parts are hard to come by... disconnect the AFM and see how the car runs.
(DME)
I disconnected the AFM, all it does is idle at high rpm at 2000
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Old 06-26-2014, 01:11 PM   #19
Ceeker
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yeah but is it still running rough?

it's gonna take some time figuring this problem out. go through the check list provided. came from a repair manual for e30's.

besides us fixing it you're pretty much given all the info available.

GL.
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I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.

latest addition as of 2013-Gold 87-325is auto! it's a keeper!
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Old 06-26-2014, 04:46 PM   #20
bimmere30
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If you mean rpm going up and down no there is none of that when the AFM is disconnected.. btw by rough u mean if I hit the gas and does it make a rough sound then yes there is a little roughness/sputtering/small pop sound. It happens even with the AFM connected. The car wants to stall out it barely reaches the point when it hits 500 rpm, but sometimes it does stall out. The last thing I changed were fpr and took out AFM (I think I dropped it) and the icv air hose got disconnected, but I changed the air hose with new one and sealed the crack hose at the intake L-shaped one.

Last edited by bimmere30; 06-26-2014 at 06:19 PM.
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