383 stroker problem
Safety Car
Joined: Mar 2000
Posts: 3,581
Likes: 1
From: Springfield VA
Re: 383 stroker problem (19vette91)
I just received my 12th chip last night and the same problem (hesitation & backfiring between 2000 & 3000 rpm) Is still there. This Is sooo frustrating after 2 1/2 months and over $1500 spent just trying to tune the car. I'm even thinking of selling the car, but who would buy a car with a new engine that doesn't run right. UGH!!!!!! :banghead: :banghead: :banghead:
Hang in there ...and good luck!
Safety Car
Joined: Mar 2000
Posts: 3,581
Likes: 1
From: Springfield VA
Re: 383 stroker problem (19vette91)
The Accel DFI is an aftermarket computer Engine Management Unit. http://www.hesco.us/dfi/fandb.html It takes all of the engine magagement functions away from the oem chip and puts it into a programmable computer.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: 383 stroker problem (96LT1)
You seem to be zeroing in on the PROM as the cause, but with so many tried, I seriously doubt it's the cause. It should be pretty obvious by now that continuing to change PROMs isn't likely to cure the problem.
It's time to look else where. I recall recently several guys had problems that they believed were being caused by one thing only to later find it was caused by something completely different. The cardinal rule is "Don't assume anything".
I'd first check and verify all the basic installation issues especially for vacuum leaks (these engines are very sensitive to vacuum leaks, more-so than a carbed engine), etc.
Bullet Biting Time: You are going to have to log sensor data during the time and RPM range that the problem occurs. Diacom is great for this. Later you can look back at the saved data and you'll probably find the cause.
Many of these kinds of problems are simple to fix, it's FINDING the cause that's the real problem. It could be something as simple as the system dropping out of closed loop during the period that the problem occurs.
It could be an intermittent sensor input problem, say your coolant temp sensor and/or air temp sensor is giving bogus input to the ECM. Someone recently had that problem.
Fuel and ignition timing are two other areas that need to be verified. Diacom or some other program can log the timing data for you and a fuel pressure gauge taped to the windshield will take care of the fuel flow.
Without the numbers, you'll just be shooting in the dark, hoping to hit something. If you take it to a shop, that's all they're going to do, verify the numbers.
It's just like going to the doctor complaining about some aliment. What he'll/she'll do is make a series of tests. Play "doctor" to your engine.
Just my thoughts; hope they help.
Jake
It's time to look else where. I recall recently several guys had problems that they believed were being caused by one thing only to later find it was caused by something completely different. The cardinal rule is "Don't assume anything".
I'd first check and verify all the basic installation issues especially for vacuum leaks (these engines are very sensitive to vacuum leaks, more-so than a carbed engine), etc.
Bullet Biting Time: You are going to have to log sensor data during the time and RPM range that the problem occurs. Diacom is great for this. Later you can look back at the saved data and you'll probably find the cause.
Many of these kinds of problems are simple to fix, it's FINDING the cause that's the real problem. It could be something as simple as the system dropping out of closed loop during the period that the problem occurs.
It could be an intermittent sensor input problem, say your coolant temp sensor and/or air temp sensor is giving bogus input to the ECM. Someone recently had that problem.
Fuel and ignition timing are two other areas that need to be verified. Diacom or some other program can log the timing data for you and a fuel pressure gauge taped to the windshield will take care of the fuel flow.
Without the numbers, you'll just be shooting in the dark, hoping to hit something. If you take it to a shop, that's all they're going to do, verify the numbers.
It's just like going to the doctor complaining about some aliment. What he'll/she'll do is make a series of tests. Play "doctor" to your engine.
Just my thoughts; hope they help.
Jake
