1993 BMW 325 bought a 1993 325i

Tiny
FADOWNJOO
  • MEMBER
  • 1993 BMW 325
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Hey, I just bought a 1993 325i but it has some issues. It leaks oil, smog smells pretty heavy, and it shuts off on idle, also a check engine light. Any idea what possible problems could be causing it? When I get it running it actually runs fine.-Thx
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Saturday, December 26th, 2009 AT 10:31 PM

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Tiny
DR LOOT
  • EXPERT
Your question is fairly vague, but I'll try to guess what you mean. For that model of BMW, I have seen a lot of oil leaks associated with the valve cover gasket. The oil runs down over the exhaust manifolds and burns from the high heat. This might be the "smog smell" you are referring to. As far as the shut off at idle is concerned, I would check the throttle boot first. The boots have to flex a lot because they bring air from the air cleaner/mass air flow assembly to the throttle body on the intake manifold. The air cleaner is bolted to the body, and the engine sits on rubber mounts which allow it to move with respect to the body. That's what generates the flex. As the rubber boot gets older, it drys out and cracks which lets unmetered air into the engine. This causes the engine computer to incorrectly meter the gas and feed the engine an improper mixture. The effect is more pronounced at idle speeds which can cause the engine to die. At higher RPMs, the problem is less noticeable.

Let me know if that helps.

Good luck.

Dr. Loot's Assistant
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Sunday, December 27th, 2009 AT 6:34 PM
Tiny
FADOWNJOO
  • MEMBER
Thanks, I have made some headway here, I opened up the ignitiers rods that sit on top of the spark plugs and found that the rubber on the bottom is chipped and broken so I taped them up as a temporary fix, smell is gone or less noticable. If I do a self diagonose I get the code 1215 which relates to the mass air flow fillter, and sometimes when I turn it on and its still in park, the rpm flucuates. Any ideas or opinions on what to do here?
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Tuesday, December 29th, 2009 AT 12:06 AM

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