91 318IS miss under load - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 02-27-2006, 11:43 AM
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91 318IS miss under load

Hi all, I just had my oil changed and to make a long story short, they left the cap off, and it sprayed oil everywhere, they cleaned it up, but now the car misses under any type of acceleration. I can feel through the gas pedal exactly where it feels like it changes something in the throttle, this is exactly when it starts to miss, no backfire or anytijng, just like a dead cylinder. any ideas?

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#2 (permalink) Old 02-27-2006, 12:24 PM
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Depending on how much oil leaked out it could of gotten down to where the spark plug is and causing it to short out if the oil is in the spark plug boot. They also could of crakced the breather hose that comes off the valve cover while they were cleaning it.
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#3 (permalink) Old 02-27-2006, 01:38 PM
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I'm thinking maybe a vacum leak or leak after the mass air flow meter?
They prob pulled the air cleaner out to check if they could get a sale?
car idels fine, wouldn't a short always miss?

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#4 (permalink) Old 02-27-2006, 06:29 PM
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99.9% of the time a miss under acceleration and not at idle is spark going where it's not supposed to. If they cleaned your motor good chance they hosed your car down with engine degreaser and water to clean it, pull your spark plug boots and I'll be willing to bet they are wet. Wipe and blow off the wires and blow out the plug wire holes completely with compressed air make sure everything is dry.

BTW. Do it one at a time so you don't lose the order...

Last edited by Starmavin; 02-27-2006 at 06:34 PM.
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#5 (permalink) Old 02-27-2006, 06:36 PM
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P.S. If you can't remember when you last replaced your wires, this is a good time to consider doing it.
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#6 (permalink) Old 02-27-2006, 08:57 PM
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ok, that sounds like an idea, I will dig into it tuesday and report back what I find, I belive they are under the BMW emblem strip form what I saw yesterday.
And, yes, I did see them out there with a hose...

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#7 (permalink) Old 02-28-2006, 12:37 PM
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Well guys, you were right! # 1 had water in it. Dried it out with compressed air and wala, no more problem!
Thx again!

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