Im losted
Thread Starter
Advanced
Joined: Jul 2009
Posts: 93
Likes: 0
From: Binghamton New York
Im losted
My vette has 91,000 miles
i have changed plugs,wires,filter, new gas filter
all runs great at start and cruising
but at stop in gear at lite it idles very rough
any suggestions
do u think my cats are plugged
Thanks
i have changed plugs,wires,filter, new gas filter
all runs great at start and cruising
but at stop in gear at lite it idles very rough
any suggestions
do u think my cats are plugged
Thanks
Race Director
Joined: Aug 2006
Posts: 18,346
Likes: 1
From: D / FW
Is the check engine light on ?
Have you checked the codes ?
Only need a paperclip to read codes and you can likely find the key to the codes in our tech section.
Could be an Idle Solenoid issue too !
You need to include the year for anyone to make a good guess !
Oh yeah bad gas will make one black smoke and Idle rough !
Have you checked the codes ?
Only need a paperclip to read codes and you can likely find the key to the codes in our tech section.
Could be an Idle Solenoid issue too !
You need to include the year for anyone to make a good guess !
Oh yeah bad gas will make one black smoke and Idle rough !
Le Mans Master
Joined: Dec 2005
Posts: 5,198
Likes: 10
From: Homestead Fl
St. Jude Donor '06-'07-'10-'11-'12-'13-'14
Ohmed your injectors? A new set of injectors took care of my recent rough idle problem. Good chance someone will chime in on troubleshooting your problem.
Race Director
Joined: May 2006
Posts: 10,691
Likes: 71
From: Phoenix Arizona
Good chance you have sticky/plugged injectors. Ohming them will tell you if they have bad coils, but won't show if they are plugged or sticking. Also check for vacuum leaks and a sticky or leaking egr valve.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
An ohmeter will only find GROSS injector coil failures! An ohmeter will not find an injector with a turn to turn short in its coil and this kind of failure will prevent an injector from working. This is true because injector coils are pulsed. You really need an impedance bridge to conclusively electrically test injector coils. I found one bad injector with an impedance bridge on my 87 vette and my ohmeter said it was exactly like the other 7 injectors. I'm not saying don't use your ohmeter, I merely pointing out that an ohmeter isn't a definitive test.
Racer
Joined: Mar 2008
Posts: 301
Likes: 0
From: Seattle / Tacoma area Washington
It ran rough before that, but I just figured it was from sitting for a few weeks. Then the flatbedding.
Found out, my EGR was stuck open. Replaced that and now my car runs better than ever.
So EGR valve is one possibility. Every once in a while, i will get ambitious and check my vacuum lines, once in a while I find one that is brittle or cracked and replace it.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
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
