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I have a check engine light P0300 (random.

Tiny
AKOG
  • MEMBER
  • 2001 OLDSMOBILE AURORA
  • 120,000 MILES
I have a check engine light P0300 (random cylinder misfire) that I cannot figure out the problem. It runs and drives fine, but it dies randomly usually when I'm at a stop light. (This only happens usually 1 in every 20 times I drive the car). My mechanic friend cannot figure out the problem. He says it could be a bunch of things, injectors, coils, plugs. Etc. I don't want to dump a bunch of money trying to figure out the problem by fixing all these things, I'd rather figure out the one thing that is actually is causing my problem. Ideas? Please help. Thanks!
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Monday, November 12th, 2012 AT 9:15 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfires are normally caused by vacuum leak and contaminated fuel-
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Monday, November 12th, 2012 AT 9:17 AM
Tiny
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I did run some chevron techron into a couple tanks already so I don't think it could be the fuel. How do you fix a vacuum leak?
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Monday, November 12th, 2012 AT 10:47 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the vacuum hoses and also on the base of the intake manifold for an hissing noise
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Monday, November 12th, 2012 AT 11:21 PM

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