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E36 M3 (1995-1999)

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  #1  
Old 02-04-2012, 10:30 AM
rscottdds rscottdds is offline
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Location: California
 
Join Date: Feb 2012
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Mein Auto: m3
98 m3 running rough (shaking)

My sons m3 will all of a sudden start shaking. If he turns it off and waits 10 seconds or so he can start it and it will run normal. If he turns it off and instantly starts it it will still shake. It almost sounds to me like its misfiring. It doesn't happen when he first starts the car. It will just randomly start shaking and he will have to do the turn off/restart thing to get it back to normal. Any ideas?
-Robert

Last edited by rscottdds; 02-04-2012 at 04:19 PM.
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  #2  
Old 02-05-2012, 05:24 PM
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fun2drive fun2drive is offline
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Location: Panhandle of Florida
 
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Mein Auto: 335 vert//M3/4/ 13Outback
Is the car showing a check engine light?
First thing to check is to pull the codes on it.
Shaking is hard to trouble shoot with out a lot more details.
It helps to provide us the year and as much information about the problem as possible like if the car is stock or not, what work has been done to it, etc...
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  #3  
Old 02-24-2012, 02:51 PM
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DinanM3e36 DinanM3e36 is offline
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Try turning the key on and off a couple times and prime the engine before cranking it, this will point you towards the fuel system if it seems to fix it, could be as easy fuel filter or as expensive as a fuel pump
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  #4  
Old 02-25-2012, 04:14 AM
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Pinecone Pinecone is offline
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How does turning the key on an off prime the engine?
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'95 Alpine M3 LTW
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  #5  
Old 02-25-2012, 01:22 PM
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DinanM3e36 DinanM3e36 is offline
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Sends fuel to the rail ie primes it for start...To the OP On for a few seconds then off then on again then start it
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  #6  
Old 02-26-2012, 03:02 AM
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Pinecone Pinecone is offline
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If you turn on the key, the fuel pump runs and sends fuel to the rail. No need to turn on and off and on. Just turn the key on, wait a bit (10 - 20 seconds), and crank.
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'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)
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  #7  
Old 02-26-2012, 04:31 AM
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DinanM3e36 DinanM3e36 is offline
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Quote:
Originally Posted by Pinecone View Post
If you turn on the key, the fuel pump runs and sends fuel to the rail. No need to turn on and off and on. Just turn the key on, wait a bit (10 - 20 seconds), and crank.
Depending on the situation, blocked fuel filter,faulty pump ect. A couple priming blasts of fuel would be better than one, yes if all is okay you can crank it up right after you turn the key
Edit:
Also cold weather (really cold weather) has proven to cause multi key turn ons to prime the engine correctly, might have to do with slow current draw to the pump or to just push the fuel thru the super cold/frozen lines... I've never had this problem (I live in TX) but just recently I recommended this procedure to a couple fest members with similar symptoms and it fixed their issue albeit temporary as there's prob a bigger underlying problem..

To the OP also check your intake boot for any small tears and clean up your MAF and Idle valve really well if they are Gummed up this could be the issue

Last edited by DinanM3e36; 02-26-2012 at 09:03 AM.
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  #8  
Old 02-27-2012, 06:25 AM
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Pinecone Pinecone is offline
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Once the pump turns on, it generates the proper pressure. Just waiting a bit will allow the fuel to get where it needs to go.

Multi turns of the key doesn't blast anything.

And BTW, the fuel rail pressure should stay up for a while, as there are check valves to do so.
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