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E34 (1989 - 1995)

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  #1  
Old 12-03-2012, 06:27 PM
S406 S406 is offline
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Mein Auto: 00 S4, 93 525i
New miss after engine cleaning

Like the title says. I pressure washed my engine and now have a fantastic miss. I blew all electrical connections out with an air hose thinking that would fix it but nope. Anybody have any suggestions? Sounds like a new lil tick in the bottom end started too.
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  #2  
Old 12-03-2012, 07:42 PM
robertobaggio20 robertobaggio20 is offline
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This is a damn simple problem to fix. You must have washed your engine bay with the plastic bmw cover off. Water would have gotten into one or more of the spark plug wells and is causing the miss. Just blow out the water with a hose and you are done.

Even if you did not remove the cover, the water seal under the cover must have a break somewhere to allow water in. Most home hardware stores sell a kind of a rubber door seal in strips which you can cut and paste over this. I have done that on my cover and it works perfectly.

I have hosed down my engine bay, every part of it, many times, with no problems to electricals. Water can drench the afm, alternator, belts anything, no issues. Just make sure the ecu box and the fuse box is properly covered and any exposed wiring has been taped.

Last edited by robertobaggio20; 12-03-2012 at 08:50 PM.
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  #3  
Old 12-03-2012, 08:13 PM
S406 S406 is offline
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HA ha ha! Thats exactly what happened! I just spent an hour screwing around and found my misfire on cyl 4. by unplugging each plug from each coil pack to figure out which was misfiring. wish I read this before my mood got sour. But its always fun to figure out something by common sense! Thanks man!
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  #4  
Old 12-03-2012, 08:33 PM
robertobaggio20 robertobaggio20 is offline
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Quote:
Originally Posted by S406 View Post
HA ha ha! Thats exactly what happened! I just spent an hour screwing around and found my misfire on cyl 4. by unplugging each plug from each coil pack to figure out which was misfiring. wish I read this before my mood got sour. But its always fun to figure out something by common sense! Thanks man!
lolol.

I remember the first time that this happened, very vividly. Had a good time degreasing and cleaning out the engine bay, detailing everything. Then drove off and within 5 minutes the engine started heaving and shuddering. Balls shrunk right there (this was my pre mafia days). Pulled over, started looking, calmed myself down somehow and eventually found the problem. Did not have good tools then so had to use my hanky and cleanex to absorb as much water as possible by stuffing it under the coils somehow. It was a fun afternoon, thanks for reminding me !

Last edited by robertobaggio20; 12-03-2012 at 08:36 PM.
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