jmgtp
03-28-2008, 07:44 PM
Just for reference, 01 2.5GT, 5 speed, currently 66k miles
Here is the scenario:
Start the car, has the fast idle which is normal of a cold engine, say 1300-1500 rpm. I pull out of my parking space in 1st gear by easing the clutch up - no throttle applied. The car smoothly rolls out. I need to stop, clutch pedal goes in and brakes applied and here it is... the engine over the course of less than 2 seconds revs itself up to 2500 rpm. It will hold it there for a moment before calming down. It also seems that if I pop the shifter into neutral and engage the clutch (let it up) it will immediately come down.
The car has done this since day 1 that I've owned it with about 42k miles, winter, summer no difference. Within 30 seconds of driving if I come to a stop and go through the same process as above it won't do it again. But that first rollout and stop it never fails to rev itself up.
It doesnt appear to be anything mechanically wrong, like a vacuum leak. Rather, I think this is built into the software running the engine. I'm even more convinced that it is a software issue because when I put the car in neutral and let the clutch up the engine speed drops right away. The clutch pedal has 2 switches on it telling the pcm what is happening, 1 for the starter at the floor boards and one at the top of its throw to sense the moment the clutch pedal is pressed. Anyone else have this weird idle speed up on a freshly started motor? It is just a slight annoyance that irks me.
Here is the scenario:
Start the car, has the fast idle which is normal of a cold engine, say 1300-1500 rpm. I pull out of my parking space in 1st gear by easing the clutch up - no throttle applied. The car smoothly rolls out. I need to stop, clutch pedal goes in and brakes applied and here it is... the engine over the course of less than 2 seconds revs itself up to 2500 rpm. It will hold it there for a moment before calming down. It also seems that if I pop the shifter into neutral and engage the clutch (let it up) it will immediately come down.
The car has done this since day 1 that I've owned it with about 42k miles, winter, summer no difference. Within 30 seconds of driving if I come to a stop and go through the same process as above it won't do it again. But that first rollout and stop it never fails to rev itself up.
It doesnt appear to be anything mechanically wrong, like a vacuum leak. Rather, I think this is built into the software running the engine. I'm even more convinced that it is a software issue because when I put the car in neutral and let the clutch up the engine speed drops right away. The clutch pedal has 2 switches on it telling the pcm what is happening, 1 for the starter at the floor boards and one at the top of its throw to sense the moment the clutch pedal is pressed. Anyone else have this weird idle speed up on a freshly started motor? It is just a slight annoyance that irks me.