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E28 (1982 - 1988)

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  #1  
Old 11-29-2010, 05:44 AM
injunmort injunmort is offline
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Location: sugarloaf ny
 
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Mein Auto: 1990 525, 1991 535
1988 m5

greetings, just picked up a 1988 m5. not real familiar with the earlier cars. i am having difficulty getting the car to run correctly. have fuel , spark, compression. it will start and idle but breaks down as the rpms increase. is this a sign of faulty pulse generator. any suggestions will greatly appreciated. thanks again.
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  #2  
Old 11-29-2010, 02:43 PM
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drivinfaster drivinfaster is offline
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pics when you get a chance, please


as far as things to check, i would start with the simple things first. check for vac leaks, each intake port should have its own throttle plate. lots of potential there, iirc, as well as any of the rubber boots between the airflow meter and the throttles.

a vacuum guage would be helpful with this, if you have one.

what else what else what else...i would check the crank position sensor (pulse generator) also.

have you tried doing a stomp test to see if the dme has stored any codes?? not sure if the obc has 'hidden features' or not, but i would check that out as well.

not much in the way of e28's on the 'fest (just picked up an '88 535 myself) so you may be better off going to http://www.mye28.com/ to search for common causes of this issue.

good luck.

df
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  #3  
Old 11-30-2010, 06:42 AM
injunmort injunmort is offline
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thank you for the reply. no stomp test as the original radio etc is gone. is there a code reader available for this car. it has a data plug but it is smaller than my carsoft plugs. will try the other board. thank you.
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  #4  
Old 01-16-2011, 11:04 AM
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andrew sheperd andrew sheperd is offline
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Location: Spokane WA
 
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sorry I'm new here and I was wondering what could possibly be causing an E28 M5 to start going through oil besides piston rings? I don't know much about BMW's yet but I'm trying to decide whether to buy this M5 that has 230,000 miles on it as my first car or not. And if it is something that is an easy fix or not. Thanks.
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  #5  
Old 01-16-2011, 03:20 PM
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catso catso is offline
catso
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Quote:
Originally Posted by andrew sheperd View Post
sorry I'm new here and I was wondering what could possibly be causing an E28 M5 to start going through oil besides piston rings? I don't know much about BMW's yet but I'm trying to decide whether to buy this M5 that has 230,000 miles on it as my first car or not. And if it is something that is an easy fix or not. Thanks.
Leaking valve stem oil seals or valve guides are a possibilty. Do compression tests with and without squirting oil into the cylinders to confirm whether it's rings. An M5 with 230,000 miles that has been driven hard can have a combination of all of these problems. It's not an easy fix, but these cars are pretty rare, so if you get a good deal it may be worth it. Drive the car, carefully assess the condition of it and figure out how much the repairs will cost. If you think the cost is reasonable, go for it. A nice M5 never goes out of style.

Last edited by catso; 01-16-2011 at 03:25 PM.
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  #6  
Old 01-16-2011, 10:20 PM
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andrew sheperd andrew sheperd is offline
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Quote:
Originally Posted by catso View Post
Leaking valve stem oil seals or valve guides are a possibilty. Do compression tests with and without squirting oil into the cylinders to confirm whether it's rings. An M5 with 230,000 miles that has been driven hard can have a combination of all of these problems. It's not an easy fix, but these cars are pretty rare, so if you get a good deal it may be worth it. Drive the car, carefully assess the condition of it and figure out how much the repairs will cost. If you think the cost is reasonable, go for it. A nice M5 never goes out of style.
Thanks! I would be getting the car for $2,000 and the owner metionted something about the valve guides. But it was with the first "M6" his words not mine and that cured the problem. Also he said that its a pretty slow leak and went through about half a quart over 5000 to 7000 miles or something like that.
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  #7  
Old 01-17-2011, 12:13 AM
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andrew sheperd andrew sheperd is offline
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Oh I did a little research and found the model that the owner was referring to. The E24 M6. Sorry just can't always trust what people try to sell you I guess.
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  #8  
Old 01-17-2011, 07:20 AM
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catso catso is offline
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Originally Posted by andrew sheperd View Post
Oh I did a little research and found the model that the owner was referring to. The E24 M6. Sorry just can't always trust what people try to sell you I guess.
There's a separate forum section for E24, you may want to read what they have to say.
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