94 vette
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
How high? Have you raised the redline?
my next thought would be fuel related. How old is the filter? pump?
Check the fuel pressure... it should be ~43 PSI at idle, then rise as the RPMs rise. If you see it drop off, there is your problem.
The gauge is obtainable your the local Autozone for under $40.00. It screws into a port on the right fuel rail - looks much like a large tire valve.
If you want to observe whilst driving, tape it to the windshield and gently lower the hood. The hood more then likely won't close over it, so choose smooth roads! You may want someone to watch it as you drive, or whatever.
my next thought would be fuel related. How old is the filter? pump?
Check the fuel pressure... it should be ~43 PSI at idle, then rise as the RPMs rise. If you see it drop off, there is your problem.
The gauge is obtainable your the local Autozone for under $40.00. It screws into a port on the right fuel rail - looks much like a large tire valve.
If you want to observe whilst driving, tape it to the windshield and gently lower the hood. The hood more then likely won't close over it, so choose smooth roads! You may want someone to watch it as you drive, or whatever.
Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Also, you should try to find a shop in town that has a Snap On engine scope. They can look at the spark pulses, duty cycles of the injectors, etc. in the problem rpm range. Gonna cost you $70 to $100, but that's a heck of a lot less than the money you've thrown at the problem so far.
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Rev limter is about 5800rpm on stock LT1. PCM stop the injectors when rev limit is reached, will reactiveate them when rpm drops. If you keep the engine in the same high rpm condition without backing off after hitting the limter, the engine will cut in and out as the limiter cycles the injectors.
