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Old 08-28-2007, 04:13 PM   #1
Bmwstylz
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e34 M5 - low compression on a few cylinders??

my buddy might be picking up an M5 but apparently its got low compression on just a few cylinders. its an e34 , 1991 vintage

What is the most likely cause? and $$$ to fix?
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Old 08-28-2007, 08:12 PM   #2
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tell him to walk away! seriously. s38 is an expensive girlfriend
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Old 08-28-2007, 09:54 PM   #3
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expensive $$ x100
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Old 09-01-2007, 10:59 AM   #4
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4000g's +
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Old 09-01-2007, 11:14 AM   #5
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There are only 6, how many is just a few? It could be anything from a bad head gasket ($600) to broken pistons/bent valves/cracked block (2-5k). It's not the end of the world and not all that expensive to rebuild relatively speaking but question is why? Is he interested because it's a pristine example of the exact color etc that he's always wanted, or (more likely) because he's poor and it's cheap? If he's interested because it's cheap, let him rest assured that there will be more things wrong. This is not the car to look for to try and score for cheap.

Here's a valve from my engine with "just a few cylinders with low compression"

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Old 09-01-2007, 05:53 PM   #6
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Unless the car is in excellent shape otherwise, AND he is getting a great deal, i would say dont get into it! (unless he wants to spend another $5-8K)...
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Old 09-04-2007, 05:12 PM   #7
Darkness95m3
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Great car, however the engine is expensive to rebuild.
However it could be some bad valve seats or valves.
Having said that unless he has deep pockets stay away from it.
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Old 09-05-2007, 07:38 AM   #8
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Quote:
Originally Posted by Darkness95m3 View Post
Great car, however the engine is expensive to rebuild.
However it could be some bad ... valves.
That's hardly a "however". Exhaust valves are 350 a piece, intake are 200-250. 12 of each. Do the math.
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Old 09-04-2007, 08:50 PM   #9
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i doubt a head gasket is only 600$$ orless he is doing it him self what is a hard job on that engine good 6+ hours
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