Hoping you guys can help me out with an issue I'm having.
I have a 1987 Fiero with a 2002 3.8 SC (45k) engine. It has a pretty open exhaust on it. No cat, 2.5 down pipe, y-pipe to two HI Flow mufflers and tips. From begging to end the exhaust might be 4ft. No (real) bottle neck the smallest part is about 4inches long and measures just over 2.25 inches. Nothing like the factory bottle neck on the GP. 180 thermo. Cold air intake. I replaced my plugs with the NGK TR6 gapped .45. Recently A issue came up. When the car is cold / not warmed up, I can floor it and it goes like a bat out of hell. Once warmed up and I floor it, it falls on it's face. Goes great at 3/4 throttle. However at a light / stopped and I floor it it bucks and sounds horrible. Any ideas? Gas? ECM? Exhaust?
Maybe check your coolant temp sensor. Actually unplug it and see if your terminals are corroded. I'm not sure what the resistance value should be when warm, but I'm wondering if a bad sensor or bad connection may be fooling your ECM into thinking the engine is cold all the time and flooding it out when it gets warmed up. Just my guess...
I'll check out the coolant sensor. Only thing last year when I did the sap I forgot to re-install the thermostat and the car an great. Even when I did put the thermo in the car ran great. This issue just started happening. Today I replaced all three Ignition coils. And it still acted up. guess my next thing is to check the plug gap.
99% sure it's the plug wires. Look very carefully at the plug boot ends. Scanning it with something like the torque App will tell you exactly what cylinder is misfiring.
99% sure it's the plug wires. Look very carefully at the plug boot ends. Scanning it with something like the torque App will tell you exactly what cylinder is misfiring.
mine was similiar and my problem was the ICM. fixed it right up. I've read on one of these threads that even too wide a spark plug gap will cause a ICM to fail. my plugs were all over .70.
