95 5.7 Troubles Missing When Hot

[dan6969]

Hey all. I have a 95 Yukon that is missing when the engine warms up. I have changed most of the sensors and the distruibutor. It starts fine and the timing is solid. Took to the gm dealer and they couldn't fine anything wrong...500.00 bucks. I am lost on this one since there are no codes showing up OBD1. any help out there.

[Genuinefine409]

Hey all. I have a 95 Yukon that is missing when the engine warms up. I have changed most of the sensors and the distruibutor. It starts fine and the timing is solid. Took to the gm dealer and they couldn't fine anything wrong...500.00 bucks. I am lost on this one since there are no codes showing up OBD1. any help out there.

 

 

When you changed the distributor, did the new one come with a new pickup coil and module? it sounds like it would be a module acting up. cold they work ok, then when hot they act up. my brother just went through a simular symptom and it was the ignition module.

 

also, how are the plugs and plug wires? cap and rotor? its hard to tell by looking sometimes, but you can watch the injectors to make sure they are spraying and not cutting out at all.

[dan6969]

Hey all. I have a 95 Yukon that is missing when the engine warms up. I have changed most of the sensors and the distruibutor. It starts fine and the timing is solid. Took to the gm dealer and they couldn't fine anything wrong...500.00 bucks. I am lost on this one since there are no codes showing up OBD1. any help out there.

 

 

When you changed the distributor, did the new one come with a new pickup coil and module? it sounds like it would be a module acting up. cold they work ok, then when hot they act up. my brother just went through a simular symptom and it was the ignition module.

 

also, how are the plugs and plug wires? cap and rotor? its hard to tell by looking sometimes, but you can watch the injectors to make sure they are spraying and not cutting out at all.

 

 

Yea. the pickup coil and mod where new. new plugs wires cap and rotor. I'm dumfounded

[1999 Tahoe 4x4]

I had something similar on a Cadillac. Actually this is how it started and later the car was even loosing power. No codes. They did an exhaust backpressure test and it turned out to be the a clogged cat converter. New cat solved the problem.