A serious problem - ZR-1 Net Registry Forums

8upZR1 · 07-25-2007

I have a serious problem with my 90. People who have read this forum know how F'd my car is. If anyone has any ideas I would love for you to share them with me. The car starts, but does not idle. If you just hold the rpms above 1000 it runs roughly. Throttle response is absolutely miserable. As I accelerate from a stop the car has not enough torque to get going. I have to stab at the clutch a little to get the car moving. Once moving it feels alright from 1500 rpm till about 2200 rpm. Then it feels like it has hit a brick wall, I press the throttle all the way down at this point and the car slowly accelerates with much effort. Once I hit about 3000 rpm the car comes alive and runs smoothly, throttle response is great, and the acceleration is excellent, but then at around 5,000 rpm the party is over, and by 5500 rpm the motor feels like I have hit a 2 step rev limit. I get deeper into the gas and the motor just starts popping and wont go past 5500 rpm.

I have no fault codes, everything looks good. Most sensors and components dealing with engine/injection have been recently replaced. I have been swapping between factory and haibec chips. Not that much difference. One notable thing was that the factory chip would sometimes let the car idle with the A/C off at 900 rpm, very steady. Then I would turn on the A/C and the rpms would crash.

When I first got the car I remember that it would run like total crap, just like it does now, but only very intermittently. Maybe once every couple of days for a few minutes. Back then I noticed that it seemed to never do it when the car was hot but it would do it when cold. Now it is just constant. Turning the full engine power key off makes no difference.

For a while I had a short runner intake on the car and I thought that was contributing to the torque/throttle response problem so I swapped to a factory unit. It helped a tiny bit but while I could feel some improvement I could also feel this underlying problem.

Today I was playiong with the car and at one point I hopped in and started the car and it felt awesome. I pulled it out of the driveway and it felt great, but then I noticed the SES light was blinking at me. I then realized I still had the pins connected on the ALDL to get the trouble codes. I didn't know if driving the car with the pins jumped was bad so I pulled the paper clip and it ran like crap again. Can I drive the car with the pins jumped? Can I hurt something by doing this? If anyone has suggestions I would be greatful.

07-25-2007	#1
8upZR1 Join Date: Jun 2006 Location: Thunderbolt, Ga. Posts: 253	A serious problem I have a serious problem with my 90. People who have read this forum know how F'd my car is. If anyone has any ideas I would love for you to share them with me. The car starts, but does not idle. If you just hold the rpms above 1000 it runs roughly. Throttle response is absolutely miserable. As I accelerate from a stop the car has not enough torque to get going. I have to stab at the clutch a little to get the car moving. Once moving it feels alright from 1500 rpm till about 2200 rpm. Then it feels like it has hit a brick wall, I press the throttle all the way down at this point and the car slowly accelerates with much effort. Once I hit about 3000 rpm the car comes alive and runs smoothly, throttle response is great, and the acceleration is excellent, but then at around 5,000 rpm the party is over, and by 5500 rpm the motor feels like I have hit a 2 step rev limit. I get deeper into the gas and the motor just starts popping and wont go past 5500 rpm. I have no fault codes, everything looks good. Most sensors and components dealing with engine/injection have been recently replaced. I have been swapping between factory and haibec chips. Not that much difference. One notable thing was that the factory chip would sometimes let the car idle with the A/C off at 900 rpm, very steady. Then I would turn on the A/C and the rpms would crash. When I first got the car I remember that it would run like total crap, just like it does now, but only very intermittently. Maybe once every couple of days for a few minutes. Back then I noticed that it seemed to never do it when the car was hot but it would do it when cold. Now it is just constant. Turning the full engine power key off makes no difference. For a while I had a short runner intake on the car and I thought that was contributing to the torque/throttle response problem so I swapped to a factory unit. It helped a tiny bit but while I could feel some improvement I could also feel this underlying problem. Today I was playiong with the car and at one point I hopped in and started the car and it felt awesome. I pulled it out of the driveway and it felt great, but then I noticed the SES light was blinking at me. I then realized I still had the pins connected on the ALDL to get the trouble codes. I didn't know if driving the car with the pins jumped was bad so I pulled the paper clip and it ran like crap again. Can I drive the car with the pins jumped? Can I hurt something by doing this? If anyone has suggestions I would be greatful.