Miss at high RPM
Thread Starter
Staging Lane
Joined: Feb 2005
Posts: 72
Likes: 0
From: Damascus, MD
Miss at high RPM Hey guys, I am new here so all help would be appreciated. I have a 94 Z28 with minor bolt ons and I have a missfire at high rpm's. I have replaced, plugs, wires, fuel filter, optispark, coil. I dont have any idea whats wrong. Anyone know what it could be??
Oh yeah, also it only does it when the car is completly warm, is its cold. It wont do it
Oh yeah, also it only does it when the car is completly warm, is its cold. It wont do it
Teching In
Joined: Feb 2005
Posts: 36
Likes: 0
Did you change the coil wire? I've heard of some people changing that and fixing the problem, some didn't I guess the fix for this kind of thing is hit or miss at best. Unfortunatly this problem is way too common on our cars...
Trending Topics
it should have been in the package with the other wires. if not im sure you could order it from an MSD dealer. as far as where is it on the engine. look at the drivers side cylinder head in the front. the coil should be sitting right there and have a fairly short plug wire running out the to behind the water pump. thats it right there
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
Teching In
Joined: Jan 2004
Posts: 14
Likes: 0
From: Indiana
Is one of your bolt-ons a power module? I had one on my 94 Z and it developed a distinct miss at high rpm and I couldn't figure out what it was forever. I started taking things off to try and fix it and it happened to be the first thing and it fixed it. But if you dont have one, i cant think of anything else.
Originally Posted by Pegleg
Hey guys, I am new here so all help would be appreciated. I have a 94 Z28 with minor bolt ons and I have a missfire at high rpm's. I have replaced, plugs, wires, fuel filter, optispark, coil. I dont have any idea whats wrong. Anyone know what it could be??
Oh yeah, also it only does it when the car is completly warm, is its cold. It wont do it
Oh yeah, also it only does it when the car is completly warm, is its cold. It wont do it
Teching In
Joined: Dec 2004
Posts: 47
Likes: 0
you might want to consider the possibility that the Ignition Control Module is gone bad, here is a link to a website that explains how to test it with a multimeter...http://shbox.com/1/4th_gen_tech2.html#opti_test
good luck with it, usuallly when they go out the car will develop a high end miss then the car will proceed not to fire up at all when you on a hot date
i have recently dealt with this problem on my 95...you can pm me if you have any questions...good luck
good luck with it, usuallly when they go out the car will develop a high end miss then the car will proceed not to fire up at all when you on a hot date
i have recently dealt with this problem on my 95...you can pm me if you have any questions...good luck
wait until night time, pop the hood while the car is warm and watch both sides of the motor for sparks. The plug wires are probably arcing to the headers/manifolds. If it doesn't spark at idle have somebody rev it for you, but you probably won't need that. Pay special attention to the rear wire on the drivers side, that's the one that does it the most.
