Misfire only at idle...
Thread Starter
10 Second Club
Joined: Aug 2005
Posts: 567
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From: Tennessee Tech
Misfire only at idle... Well like the title says, I've got a misfire at idle.. Scanned the car with Hptuners and it came back that cyl. 5 & 4 were misfiring, 5 about 3 times more than 4. I changed the plug wire on 5 and it didn't help, changed plug on 5 and nothing, so i gave the car alittle gas and the misfire disappeared.... Over 1600 RPM's and it goes away... Could someone enlighten me on what could be the problem.
This happened to me on my '99 Sierra pickup. Drove me crazy. It turned out to be the fuel pressure regulator located between the fuel rails was bad and causing the passenger side fuel rail fuel pressure to be low which caused it to misfire at idle. Check that.
Thread Starter
10 Second Club
Joined: Aug 2005
Posts: 567
Likes: 0
From: Tennessee Tech
Thanks guys... I'm gonna check into the fuel pressure regulator first, and if that isn't it It's going to the shop... I'm getting some work done to it next month anyways and the guy said if i didn't have it figured out by then, he'd do some more troubleshooting.
