|04-12-2008, 02:25 AM||#1|
Join Date: Apr 2008
1997 SL revs up, but auto-transmission will not change gears
I have a 1997 SL that revs up, but will not change gears. When this happens, I cannot get a gear that will go faster than 20-30 mph. This does not happen all of the time. I have noticed that the water temp increases before this happens. Oddly enough, if I let the car cool down a little, it shifts normally again. What can cause this to happen??
Exactly what happens when the ECTS is bad?
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|04-12-2008, 08:51 AM||#2|
Join Date: Jan 2006
2003 L-Series 3.0L Sedan
Re: 1997 SL revs up, but auto-transmission will not change gears
You're describing very strange symptoms that are either two separate issues or possibly one issue creating another. You'll need to answer some basic questions unless other members have a better idea and can assist quicker.
1-Does your car start cold and idle at 1200 rpm, gradually lowering back to 800-900 rpm after 10 minutes or so of driving? If it does, there may be a transmission problem. If your engine doesn't fit this normal start-up sequence then you'll need to know about the engine coolant temperature sensor (ECTS).
The original coolant sensor has a tendency to crack and keeps a higher idle with rich mixtures, sometimes a very high idle. This becomes a major driveability issue that may also affect the transmission shifting correctly. Look in the How-to Tips first two posts covering the two-wire sensor and connector, pictures and procedures included. It may also be a good time to clean the throttle body of crud build-up using throttle cleaner.
2-After checking and/or replacing the coolant sensor you may want to replace the thermostat if the temperature gauge never goes above the 1/4 mark. A stuck thermostat compounds a coolant sensor problem with either overheating or little to no heat for the heater coil during winter months.
Depending on the mileage, it may help to consider changing the transmission oil and filter if the fluid color has darkened from original, suggesting components cooking within.
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