本文发表在 rolia.net 枫下论坛Base on what you said, you just have the water pump serviced, your car may have the engine coolant temperature sensor broken or disconnected, if this sensor is broken or not connected to the on board computer, the computer lost the data of the engine temperature, and it will think it is in winter cold weather start up. That is why the engine runs at high RPM and triggers the EXCESSIVE IDLE SPEED alarm message. Go back CT and express your concern, have them check the connection. But they may say some thing else is wrong and charge you more. Be smart, Good luck,
In a previous article we discussed troubleshooting the Throttle Position Sensor and the important role it plays in driveability. Another analog sensor of primary importance is the Engine Coolant Temperature Sensor, or ECT for short. In the older engine diagnostic terminology before OBD II, most manufacturers called it the Coolant Temperature Sensor, or CTS.
[ The ECT tells the computer what the engine temperature is so that optimum driveability is realized while the engine is warming up and when the engine has reached operating temperature. In "B.C." days (Before Computers), cold engine performance was under the control of an automatic choke whose adjustment was critical. Even when properly adjusted, the engine had to warm up before the car would perform properly. Often the engine had to be run at high rpm at idle just to keep it running when very cold. Then the engine would stumble and hesitate until it got warm. ]
More info in this link... http://www.asashop.org/autoinc/may98/techtotech.htm
For your own benefit, I suggest you print out and bring along the page from the web site, this will show to them how much you know cars. They can't screw you up.更多精彩文章及讨论，请光临枫下论坛 rolia.net
In a previous article we discussed troubleshooting the Throttle Position Sensor and the important role it plays in driveability. Another analog sensor of primary importance is the Engine Coolant Temperature Sensor, or ECT for short. In the older engine diagnostic terminology before OBD II, most manufacturers called it the Coolant Temperature Sensor, or CTS.
[ The ECT tells the computer what the engine temperature is so that optimum driveability is realized while the engine is warming up and when the engine has reached operating temperature. In "B.C." days (Before Computers), cold engine performance was under the control of an automatic choke whose adjustment was critical. Even when properly adjusted, the engine had to warm up before the car would perform properly. Often the engine had to be run at high rpm at idle just to keep it running when very cold. Then the engine would stumble and hesitate until it got warm. ]
More info in this link... http://www.asashop.org/autoinc/may98/techtotech.htm
For your own benefit, I suggest you print out and bring along the page from the web site, this will show to them how much you know cars. They can't screw you up.更多精彩文章及讨论，请光临枫下论坛 rolia.net