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P0300 misfiring help!

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New User

Jul 10, 2019, 10:41 PM

Post #1 of 3 (416 views)
P0300 misfiring help! Sign In

Hello, so i know this is a shot in the dark, but my car recently starting misfiring the other day and obviously gave the infamous p0300. I know this is very broad, but im hoping someone can point me in the right direction with the details im about to give. First of all its an older audi(2004 audi a6 3.0 c5). But i bottomed out last week and cracked my oil pan and temporarily patched it with JB weld.  A couple days after i started to feel a slight misfire. Then after about two days of slight misfire it went to full blown flashing check engine light. At first i assumed possibly spark plugs or coils, but i had them replaced last year after minor misfire last year. I definity had a vacuum leak from a hose that lead to a vaccuum canister and just replaced hose tonight, hoping that was the issue, i stopped the hissing noise, but im still getting misfiring. Does it take awhile for misfiring to stop after stopping vacuum leak or do i have to reset anything such as battery? Or does anyone else possibly have any other idea what else to look for? Im pretty sure that hard hit to the bottom of my car might have something to do with it... Please any advice what to look for will help.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 11, 2019, 2:50 AM

Post #2 of 3 (408 views)
Re: P0300 misfiring help! Sign In

You're going to need more info than that. Were there no individual codes in addition to the P0300?

You'll have to study data to get an idea if it's too lean or too rich or anything else out of parameter.

I would guess that this has something to do with the engine being jarred. Look for broken plugs, loose wires or anything of that nature.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 11, 2019, 6:15 AM

Post #3 of 3 (398 views)
Re: P0300 misfiring help! Sign In

"Cracked oil pan" It required an attempt to fix you said.
About now the only question is how much oil leaked out if any or lots? Not much else matters if you drove it too low or out of oil? Impact might have wrecked any warning of low oil or oil pressure. If hard enough hit no telling what can go wrong up to end of car!


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