P0300?
Thread Starter
Le Mans Master
Joined: Nov 2007
Posts: 6,418
Likes: 198
From: Wilkes-Barre Pa
P0300?
Just went full throttle in 2nd gear and afterward I had a flashing CEL for a few seconds. When I scanned it I have P0300 pending which is random misfire.
Any ideas what would cause this?
Any ideas what would cause this?
Thread Starter
Le Mans Master
Joined: Nov 2007
Posts: 6,418
Likes: 198
From: Wilkes-Barre Pa
On the drive home it felt and sounded normal. Before this I was at full throttle several times without any problems.
I'll try to go out this afternoon and see if it happens again.
I do have aftermarket high flow cats.
I'll try to go out this afternoon and see if it happens again.
I do have aftermarket high flow cats.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Check your spark plugs, make sure that they are gapped properly, and have no cracks in them. I have seen some plugs that get installed wrong where they get cracked during installatio which can cause intermittent misfires, especially under boost and higher engine speeds. Also double check your spark plug wire boots for holes and or cracks or ther defects. Any one of these can cause misfires under boost and high engine load and speeds.
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Racer
Joined: Jan 2008
Posts: 361
Likes: 1
From: Charleston SC
It will happen again for sure. I just went through the same problem a week ago. CEL blinking(P0300) random misfire. Cleared it. Car idled and drove fine and didn't throw the code the next time I got on it. But a few days later it did it again. Long 3rd gear pull shift to 4th and shut down, light blinking again. The plugs are $1.98ea at autozone (TR6's) Gap them per ECS's specs and torque them to 11ft/lbs. Be sure to use anti sieze grease on the threads (liberally) and hand tighten all the way first before torquing them down.
Tools needed: Torque wrench; plug socket (can't think of the size off hand); a 3" extension for the torque wrench.
Meth is hard on the plugs, they should be changed every 9-10K miles.
Tools needed: Torque wrench; plug socket (can't think of the size off hand); a 3" extension for the torque wrench.
Meth is hard on the plugs, they should be changed every 9-10K miles.
Last edited by APSGTO; May 23, 2011 at 04:26 PM.
Melting Slicks
Joined: Apr 2007
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From: Willow Springs IL
As long as we are talking about plugs. How often should they be changed on supercharged cars? I've got over 15,000 miles on mine. The car runs fine, but maybe it could be better than it is now?
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Drifting
Joined: Oct 2006
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From: DELRAY BEACH FLORIDA
St. Jude Donor '10-'13
I'm having a similiar problem with a NON FI 08 A6. But with an weird twist. This PO 300 code only happens in the D mode and then it goes into Limp mode. It does NOT happen in S mode. Just had the tranny rebuilt and NEVER had this problem before the rebuild. Does anyone have any ideas why this would occur only in Drive? If it were plugs or wires..I would think it would occur in both the drive mode and well as the S mode.
Race Director
Joined: Jul 2005
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From: Central MO
Racer
Joined: Jan 2008
Posts: 361
Likes: 1
From: Charleston SC
