Birdie2000
Club Member
Car is a 2000 Cavalier z24 w/ 2.4 and 5 spd manual.
2 problems:
1.) Sometimes in the morning when the engine is still cold, the engine will race when disengage the clutch. So if I'm driving out of my parking lot in the morning, when I push the clutch in to come to a stop, the engine will either hold the 2,000-2,500 rpms it was at while still engaged, or it'll creep up to that if I was at a lower engine speed before pressing the pedal. It will not return to a normal idle speed without putting it back in gear for a minute to bring it back down to the normal 1,000 rpm idle. After a minute or two of driving (by the time I leave my parking lot) it'll drive normally.
2.) If I'm accelerating from a stop and I have to pop the clutch and hit the brakes (in a traffic jam for instance), sometimes when the engine is going back down to idle speed, it goes past the normal 1,000 rpm idle speed and down to 400-500 rpm, shudders a bit, then goes back up to normal. Occasionally this is enough to stall the car which is really frustrating because not only do I look like a dumbass, but it always takes a second to start after being stalled which only further adds to the dumbass factor. Turning the steering wheel all the way to one side and putting strain on the power steering pump will also cause it to dip down for a sec and hunt for an idle, but it returns to normal quickly even if I don't let off the steering wheel.
These are relatively minor intermittent problems and don't happen very often, but still annoying nonetheless. Is it likely a TPS or IAC sensor, or should I be hunting down a vacuum leak. I've looked things over and I can't find a vacuum leak yet, but I suppose there could be one hiding somewhere.
2 problems:
1.) Sometimes in the morning when the engine is still cold, the engine will race when disengage the clutch. So if I'm driving out of my parking lot in the morning, when I push the clutch in to come to a stop, the engine will either hold the 2,000-2,500 rpms it was at while still engaged, or it'll creep up to that if I was at a lower engine speed before pressing the pedal. It will not return to a normal idle speed without putting it back in gear for a minute to bring it back down to the normal 1,000 rpm idle. After a minute or two of driving (by the time I leave my parking lot) it'll drive normally.
2.) If I'm accelerating from a stop and I have to pop the clutch and hit the brakes (in a traffic jam for instance), sometimes when the engine is going back down to idle speed, it goes past the normal 1,000 rpm idle speed and down to 400-500 rpm, shudders a bit, then goes back up to normal. Occasionally this is enough to stall the car which is really frustrating because not only do I look like a dumbass, but it always takes a second to start after being stalled which only further adds to the dumbass factor. Turning the steering wheel all the way to one side and putting strain on the power steering pump will also cause it to dip down for a sec and hunt for an idle, but it returns to normal quickly even if I don't let off the steering wheel.
These are relatively minor intermittent problems and don't happen very often, but still annoying nonetheless. Is it likely a TPS or IAC sensor, or should I be hunting down a vacuum leak. I've looked things over and I can't find a vacuum leak yet, but I suppose there could be one hiding somewhere.
