Hey maybe someone can help me out. I am at my wits end with this vehicle, it is a 94 trans am with an auto trans. As soon as the motor warms up to operating temp it starts dumping fuel and breaking up, bogging, etc. It's blowing black crap out of the exhuast. When you first start it and the motor is cold, you can tell it is running a little rich, but does not bog and runs relatively smooth. I screwed around with hypertechs power programmer on the vehicle, but put everything back to factory settings after this started happening. O.K. so heres what i have done to try and fix it...replaced map sensor, tps sensor, O2 sensors, MAF sensor, knock sensor, took it to a shop had coil replaced, and injectors checked out and cleaned, got the computer reprogrammed at the dealer, i checked the catylitic converter myself and it is not clogged. ALso i installed the slp loudmouth cat-back exhuast.
ANy suggestions would be greatly appreciated, i am thinking of changing out the computer. I dunno if it will work...someone help, please!!

 

opti?

 

94 pontiac trans am

 

Oh yea i had the opti spark replaced...that screwed up peice of crap gm decided to put on instead of a distibutor....yea.

 

Try some new plugs, or make sure yours are gapped correctly. I bought a set of "pregapped" plugs for my car, come to find out they were gapped to .035. LT1s factory gap is .50. The 35's made it run like ****, in the manner you were talking about. I thought it was some sensor problem too. I figure that when the plugs got good and hot the spark became even less effective.

 

yea i have tried new plugs and they were gapped properly. Also, after just a short while the plugs become black.

 

try the engine coolant temp sensor on the front of the waterpump. Mine did this exact same thing. I replaced that sensor and the pigtail connector going to it and it fixed it right up.

 

Ok yea i will try that. So was the actual connection to the sensor messed up on yours?

 

Yeah the connector wore out and was making a bad connection.

 

ok cool thanks!