Off idle misfire
Thread Starter
Pro
Joined: Jun 2007
Posts: 713
Likes: 9
From: Saratoga Springs Ut
Off idle misfire
I have a 2000 M6 and ever since I picked it up back in Feb I have an issue with a off idle stumble or missfire. It backifires and spits and sputters not every time but offten enough. I've replaced the plugs, plug wires and fuel filter and cleaned the air filter and TB. I'm wonering about injectors and fuel pressure now. The car has 80k on it. Any ideas?
Safety Car
Joined: Mar 2015
Posts: 3,637
Likes: 245
I have a 2000 M6 and ever since I picked it up back in Feb I have an issue with a off idle stumble or missfire. It backifires and spits and sputters not every time but offten enough. I've replaced the plugs, plug wires and fuel filter and cleaned the air filter and TB. I'm wonering about injectors and fuel pressure now. The car has 80k on it. Any ideas?
Intermediate
Joined: Jun 2017
Posts: 25
Likes: 0
I have a 2000 M6 and ever since I picked it up back in Feb I have an issue with a off idle stumble or missfire. It backifires and spits and sputters not every time but offten enough. I've replaced the plugs, plug wires and fuel filter and cleaned the air filter and TB. I'm wonering about injectors and fuel pressure now. The car has 80k on it. Any ideas?
Similar thing happened to me. I had a small barely visible crack in one of my spark plugs causing the stumble/misfire. Hope this helps. Best of luck.
-John
Instructor
Joined: Jun 2013
Posts: 143
Likes: 12
From: Ky
Have you cleaned the maf ? Just because parts are new doesn't mean they are necessarily good. If you had it before and it followed still, chances are slim it's plugs or wires. I've personally only had one car with a bad injector in 20 years of wrenching, and it was very noticable, not like a misfire. Logging with all cylinders for misfire and the rest of your data may shed some light. Recording data is a godsend in diagnosing odd issues.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer