My Grand Prix has a very noticeable miss, jerk under lite load at 2000 RPM in any gear (manual trans) It feels like plug wires arching. The wires are not neatly routed from the coil pack. Are these wires real touchy regarding proper routing and proper retainers? And if it is wires, What do you recommend? brand?
Fixing a dead miss on light load
- Thread starter carnut
- Start date
Fivefingerdeathpunch
New member
No SES light?
Why not get new wires and plugs?? Perhaps they are just old and already need to be replaced.
Why not get new wires and plugs?? Perhaps they are just old and already need to be replaced.
idrivejunk
New member
I'm curious what year GP, must be 89-96. Stumbling in cruise mode is usually a vacuum leak or weak ignition, in that order and generally speaking. Try neatly routing the plug wires to see if the trouble goes away and maybe you can answer your own question.
RareGMFan
New member
If it was factory equipped with a getrag 5-speed, it would have to be a '93 or older. They took that option away from the w-bodies with the interior redesigns in '94.
As idrivejunk said, a miss under any kind of load is usually either a vacuum leak, or ignition issue. I don't think routing is a factor so long as the right wires/plugs are connected to the right coil pack terminals. If they haven't been done in a while, I'd change out the plugs and wires regardless. If it persists, I know they're a pain in the ass to get to, but I'd pull out the coils and look at them. When I first got my 2-door TGP, it would miss BAD and had 0 power if I went more than 1/4 throttle on it. Drove it like that for a while, and then during one of the local w-body meets, one of the members just happened to look at and noticed that all 3 coil cases were split open like nothing I'd ever seen before. Switched those and the ICM out with new GM take-offs I had picked up on eBay for pretty cheap, and no more problems.
As idrivejunk said, a miss under any kind of load is usually either a vacuum leak, or ignition issue. I don't think routing is a factor so long as the right wires/plugs are connected to the right coil pack terminals. If they haven't been done in a while, I'd change out the plugs and wires regardless. If it persists, I know they're a pain in the ass to get to, but I'd pull out the coils and look at them. When I first got my 2-door TGP, it would miss BAD and had 0 power if I went more than 1/4 throttle on it. Drove it like that for a while, and then during one of the local w-body meets, one of the members just happened to look at and noticed that all 3 coil cases were split open like nothing I'd ever seen before. Switched those and the ICM out with new GM take-offs I had picked up on eBay for pretty cheap, and no more problems.
Thanks! Its a 1991 with a 5 speed stick, sorry! As an aid in diagnosis, I found a Lumina at the local Pick n Pull with the plug wires laying on the engine. I got the front three and swapped them out in the parking lot. It now runs great but I did order and got new wires, hopefully replaced today or Tuesday. I also got the retainers that hold the wires so I can route and hold them away from the exhaust and fans. Anyone have a recommendation on plugs, I'm thinking A/C Delco rapid fires.