Rough idle and dies when I put it into driver or reverse
Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
The problem came back after I just got back the exhaust shop. I have an old opti that I had from before I rebuilt the engine. It was working fine before so I'm going to see if my ebay opti is the problem. This is driving me nuts.
Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
just pulled the opti out in an hour and 1:15 minutes. It really is a f'd design to have thewater pumpover the distributor. The plug wires are tough to pull off causeof the slime thecoolantleaves behind.
Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
I drove the car over and over to kind of get a better feel for the problem. I noticed the old opti smoothed out the motor, I kind of feels like the motor lost compression. The new opti gave me a feeling that I could feel every combustion in every cylinder. Anyways, I was reading about vacuum leaks and I think I have conducted my test incorrectly. From what I hear, fuel injected engines need to be tested with the IAC disconnected. Makes sense so i going to retest for vacuum leaks.
I would see how the car runs after you readjust the rockers and get those AC Delco o2's installed.
A new opti harness might be worth a shot.
Also if you are concerned about compression, you can perform a compression and leak down test.
Also if you are concerned with compression, you can perform a compression and leak down test. (after you readjust the valves)
A new opti harness might be worth a shot.
Also if you are concerned about compression, you can perform a compression and leak down test.
Also if you are concerned with compression, you can perform a compression and leak down test. (after you readjust the valves)
Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
I put the new AC delcom O2 in and it did not help.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
I put the new AC delcom O2 in and it did not help.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
I dropped the car off at NextGen Auto Sports in Hayward CA. They are going to Dyno diagnose the car. The bummer is that they can't touch it for a week or 2 because they are swamped with work. I'll get back to the forum as soon as I have some more info.
Tic Tock, Tic Tock...
Tic Tock, Tic Tock...
Thread Starter
Staging Lane
Joined: May 2008
Posts: 75
Likes: 0
From: San Francisco, CA
quik95lt1 - you were right, it was the mail order tune. I had the car dyno tuned and now it run great. ($450) I could not really get any street time cause it was raining and i would just spin my tires. I pulled a 310 rwhp and I'm 50 hp short of my goal. I'm running a b body maf and 3 inch intake tubing. The tuner said that to go with a f body maf and 3.5 inch intake tubing. Thanks everyone for the help. I'm going to try to get my money back from the mail order tuner.
