Another Opti Question
Thread Starter
Pro
Joined: Aug 2004
Posts: 549
Likes: 13
From: Richmond VA
Another Opti Question
Just putting this winter's project together and now the engine pops thru the exhaust and I think the "new" opti distibutor is to blame. We have checked the wires and such but the car still pops thru the exhaust at idle and when rev'ed (no load).
Prior to the build no issues, however new items include ported heads, cam, timing chain, headers, distributor, injectors....
The "exhaust pop" is not consistant more like an arch in the distibutor or wires causing it to cross fire. Can't see any issues with wires so suspect the distibutor.
Is this the right path, have you heard of this happening with a "new" distributor.
Thanks!
Prior to the build no issues, however new items include ported heads, cam, timing chain, headers, distributor, injectors....
The "exhaust pop" is not consistant more like an arch in the distibutor or wires causing it to cross fire. Can't see any issues with wires so suspect the distibutor.
Is this the right path, have you heard of this happening with a "new" distributor.
Thanks!
Le Mans Master
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Go out at night when it is good and dark, pop the hood, start it up and look for any arcing in the plug wires. Scan it for codes. It does not sound like an opti problem. Did you have it retuned (PCM tuned) after the mods?
Team Owner
Joined: Feb 2006
Posts: 23,126
Likes: 117
From: San Antonio Texas
If you did the cam, I'd check the valve lash. It sounds like you might have an exhaust valve too tight and not closing completely. When you go through the firing order, check the intakes when the exhaust valve is just starting to open and check the exhausts right after the intake stops closing. There is a faster procedure, but I don't remember the order. This way is kind of slow and drawn out, but gets them all checked for sure when you get through the whole firing order.
Racer
Joined: Oct 2006
Posts: 403
Likes: 1
From: Merritt Island Florida
I had a problem like this awhile back. I bought a Actron CP9190 scan tool and it brought me to a bad spark plug wire. I replaced all my wires and the car ran perfect.
These hand scanners are great for identifying problems. They work on just about all cars too. Mine reads OBD 1 & 2 codes and came with a bunch of cables for the older vehicles.
Billy
These hand scanners are great for identifying problems. They work on just about all cars too. Mine reads OBD 1 & 2 codes and came with a bunch of cables for the older vehicles.
Billy
Thread Starter
Pro
Joined: Aug 2004
Posts: 549
Likes: 13
From: Richmond VA
Got called into work so I don't have access to the car until I get work issues resolved. I will be record the information with Datamaster and see what codes it throws, stupid me, I always forget that the computer is the best place to start. Too much time before computer controlled systems and always forget what a great source of info they can be. Thanks for slap in back of the head
Thread Starter
Pro
Joined: Aug 2004
Posts: 549
Likes: 13
From: Richmond VA
Finally got back to the car at lunch today and went back through the wires and yes we found the last 2 on the left bank arcing between them. Replace those and she is running fine with no codes.
Thanks!!!
Thanks!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
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