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Strange Surge/Hesitation

09-13-2004, 12:25 PM
I have a 1994 Lesabre w/ 110k on it, in which I as recently a year and a half ago replaced the ECM. Now, after about 30 minutes of driving, the car starts to surge, even tho it still accellerates quite chopily, and then as soon as I come to a stop it shuts off and won't turn back on till it's cooled off for at least ten minutes. I think it's either my oxygen sensor or my EGR valve. I just hope its not my ECM again. Post any ideas suggestions! Thanks.

10-10-2004, 09:26 PM
Check the coolant temp. sensor, the fan relays, and the o2 sensor. one or a combination of these may be bad. Also, if that isn't the problem, I suggest checking to make sure the Ignition Coils are properly functioning. Does the exhaust look black, and have a bad odor?

10-13-2004, 04:01 PM
You may also have a sticking TCC Solenoid. You may simply unplug it to check.

10-13-2004, 04:42 PM
"You may also have a sticking TCC Solenoid. You may simply unplug it to check."


10-15-2004, 06:22 PM
I had a similar surging problem on my '97 a couple of years ago. Replaced the throttle position sensor and the problem stopped right away.

10-15-2004, 07:12 PM
Always test before replace/purchase.

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