Gregs///M
01-19-2009, 10:34 PM
So I've been having this serious misfire issue with my M20 for a long time and I finally got the problem to go away tonight.
My car would idle fine at startup and run perfect until the engine reaches normal operating temperatures. Then I would get poor idle, hunting idle, weak acceleration, and stalling at stop lights. Once stalled, it would take several turns of the starter to get the car to start.
I've replaced a slew of engine components including injectors, AFM, plugs and finally tonight I was able to replace the Coolant Temperature Sensor.
Here is where my question comes up. I reset the ECU by disconnecting the battery on most of the component replacements. But when I replaced the Coolant sensor I started the car up and did not replace the codes. My problems continued so I assumed there was something else wrong with the car.
I also found a leaking with my Throttle intake, it was a 90 elbow connecting the Idle control valve. I sealed that up then finally reset my ECU.
After resetting my ECU, I took it for another test drive and its runs beautifully. NO idle problems at all.
My question is this. Even after installed the Coolant sensor with a new spare, will the motor continue to run poorly? Is resetting the ECU, causing the motor to idle fine now? Perhaps the small leak on the throttle was at fault? I doubt this because i caused the leak by breaking the seal during initial inspection AFTER i notice the symptoms.
What are you thoughts? Can not resetting the ECU cause the problems to continue even though the sensor is brand new?
My car would idle fine at startup and run perfect until the engine reaches normal operating temperatures. Then I would get poor idle, hunting idle, weak acceleration, and stalling at stop lights. Once stalled, it would take several turns of the starter to get the car to start.
I've replaced a slew of engine components including injectors, AFM, plugs and finally tonight I was able to replace the Coolant Temperature Sensor.
Here is where my question comes up. I reset the ECU by disconnecting the battery on most of the component replacements. But when I replaced the Coolant sensor I started the car up and did not replace the codes. My problems continued so I assumed there was something else wrong with the car.
I also found a leaking with my Throttle intake, it was a 90 elbow connecting the Idle control valve. I sealed that up then finally reset my ECU.
After resetting my ECU, I took it for another test drive and its runs beautifully. NO idle problems at all.
My question is this. Even after installed the Coolant sensor with a new spare, will the motor continue to run poorly? Is resetting the ECU, causing the motor to idle fine now? Perhaps the small leak on the throttle was at fault? I doubt this because i caused the leak by breaking the seal during initial inspection AFTER i notice the symptoms.
What are you thoughts? Can not resetting the ECU cause the problems to continue even though the sensor is brand new?