Engine Performance problem
2000 Geo Metro 4 cyl Front Wheel Drive Automatic 107000 miles
This is a problem that is getting worse by the day. It is two problems, but I think they might have to deal with each other. First when I get in and start the car in the morning, the engine will idle like it is warm, not the higher idle that I am use to it doing until the engine has warmed up. Then after I start driving the car and come to a stop, the engine will be idling higher than normal. Sometimes it will go away after the next stop light I stop at, or I will shut the car off and turn it back on and most the time it will idle normal, until I come to the next stop light. The engine was surging up and down at one stop light, but hasn’t done it sense. Here is what I have done to try to fix the problem.
I have taken apart the throttle body, disassembled it and cleaned it. I have taken off the Throttle Position sensor from the throttle body while it is still connected to the ECM and the check engine light comes on (so I think the sensor is working, could still be bad though) I have done the same with the MAS and with the Idle Air Control Valve that is located on the throttle body. The Check engine light will come on when I disconnect them all and the engine will still be idling high. So I think the sensors appear to be good to the computer, but im thinking one is bad. The MAS will effect the idle some when I pull it out or disconnect it, but I think that’s normal. Its Hard to decide which one to buy fist considering there a couple hundred a piece. Thank you for your help.
have the same problem?
Thursday, January 8th, 2009 AT 4:09 PM