Thedriftbadger
08-17-2016, 07:51 PM
At idle i get an erratic misfire, pop through the exhaust every few seconds. Pretty shaky idle but it's steady. It's not just one cylinder, every cylinder misses here and there. Accelerating at part throtte it stumbles hard but only when it's warmed up. Full throttle over 3500rpm or so it'll pull normal.
Put a timing light on it and it will skip a flash at the exact time it misfires. Does it on every cylinder.
New parts: fuel pump and filter, igniter, buick grand national coil, temp sensor.
Maf tests good, solid grounds, charging system functioning fine, no codes. Tried a new oxygen sensor, no change. Unplugged knock sensors, no improvement. Tps tests fine. All wiring appears to be in good shape.
The car was running fine exactly as it sits, this problem happened out of the blue.
The only things i haven't tried are a new cas and ecu. I'm picking up a good cas to try friday. The ecu i can't do much about because it's a redtop engine and they're impossible to find. Any input would be great. I can usually figure this stuff out quick but this one is really fighting me.
Put a timing light on it and it will skip a flash at the exact time it misfires. Does it on every cylinder.
New parts: fuel pump and filter, igniter, buick grand national coil, temp sensor.
Maf tests good, solid grounds, charging system functioning fine, no codes. Tried a new oxygen sensor, no change. Unplugged knock sensors, no improvement. Tps tests fine. All wiring appears to be in good shape.
The car was running fine exactly as it sits, this problem happened out of the blue.
The only things i haven't tried are a new cas and ecu. I'm picking up a good cas to try friday. The ecu i can't do much about because it's a redtop engine and they're impossible to find. Any input would be great. I can usually figure this stuff out quick but this one is really fighting me.