musclecar neal
Engine Builder
- Joined
- Sep 29, 2002
We are trying to figure out a strange issue we are having.
The car runs fine while just driving around with no boost. When you floor it the car will almost die. You can hold the throttle to the floor for a few seconds and the car seems like it is not even running, then will fire about 2 or 3 times and puke black smoke. It will not rpm at all while it is doing this. The car feels like the engine is off except for the 2 or 3 puffs of black smoke. If you get off the throttle and go back to idle the car will idle fine. If you play with the throttle and get it into boost , once the car has boost it runs fine and pulls like a freight train. We have done plenty of testing with no problems found so far. I was hoping it would be something really stupid but this is getting really dumb now.
Here is a list of testing we have done.
ECM has been tested and runs fine in another car.
Chip works fine in another car.
T+ works fine in another car
All grounds appear fine
plenty of fuel pressure at all times ( in car FP gauge)
tried known good ignition module and coil pack
disconnected cam sensor
tried known good MAF
TPS is set correctly and has no issues
fresh plugs
fresh denso O2 sensor
I appreciate the help I have received from some of the best minds in the Buick world and we are still at the same place we started at. The car is a monster once its up on boost and really runs well then. Its the place between no boost and boost that is killing us. The combo is in my sig. If anyone can give us anymore ideas we would love to hear what you think. I will post the results and will buy the person that comes up with the fix a beer or dinner of choice if I am ever lucky enough to shake their hand. Please don't be sacred to give us some ideas. We need your help.
Thanks for reading this and tell us what you think.
Neal
The car runs fine while just driving around with no boost. When you floor it the car will almost die. You can hold the throttle to the floor for a few seconds and the car seems like it is not even running, then will fire about 2 or 3 times and puke black smoke. It will not rpm at all while it is doing this. The car feels like the engine is off except for the 2 or 3 puffs of black smoke. If you get off the throttle and go back to idle the car will idle fine. If you play with the throttle and get it into boost , once the car has boost it runs fine and pulls like a freight train. We have done plenty of testing with no problems found so far. I was hoping it would be something really stupid but this is getting really dumb now.
Here is a list of testing we have done.
ECM has been tested and runs fine in another car.
Chip works fine in another car.
T+ works fine in another car
All grounds appear fine
plenty of fuel pressure at all times ( in car FP gauge)
tried known good ignition module and coil pack
disconnected cam sensor
tried known good MAF
TPS is set correctly and has no issues
fresh plugs
fresh denso O2 sensor
I appreciate the help I have received from some of the best minds in the Buick world and we are still at the same place we started at. The car is a monster once its up on boost and really runs well then. Its the place between no boost and boost that is killing us. The combo is in my sig. If anyone can give us anymore ideas we would love to hear what you think. I will post the results and will buy the person that comes up with the fix a beer or dinner of choice if I am ever lucky enough to shake their hand. Please don't be sacred to give us some ideas. We need your help.
Thanks for reading this and tell us what you think.
Neal