Question about 1995 Buick LeSabre
Code for trottle position sensor made check engine light come on. light stayed on all the time. Replaced trottle position sensor. Test showed sensor bad. Light went off for 500 or so miles. Check engine light now sometimes comes on[ cuts cruise off when does with cruise on]. The same trottle position sensor code shows up now, with new sensor. What do I do now? Do I replace the same sensor again? The car is a 1995 Buick LeSabre Limited. Also on same car I have problems with transmission shifting into overdrive, even after replacing filter and fluid in pan. Also added Lucus transmission fix with Castrol transmission fluid to refill transmission. I had no proplem shifting for a while after change. Problem shifting happens now just every once in a while.Is transmission flush and new filter needed now or what? I have around 8,000 miles on transmission fluid/filter change now.
Your transmission problem could be related to the TPS sensor. The TPS sensor indicated to the PCM when and what gear the transmission should be in. As for the Lucas and other additives to the transmission may be doing it more harm then good, As the transmission oil is thicker, the transmission line pressure increases. The PCM try's to compensate for that by letting the converter lock up clutch to slip and the fluid retention in the solenoid to change gears stick causing it to shudder between gear shifts. Recap, Check the TPS sensor readings and the Wire Harness. Look for loose connections and corrosion that may not be giving the proper readings to the ECM. Rescan the car for any DTC codes and most transmission chop can do that for you if your going to get it serviced there anyways. Have the transmission fluid flushed and filter changed, and have them do a transmission line pressure checked, there are additives out there to keep the fluid from foaming which is ok, but changing the fluid's weigh can cause transmission failure. Good luck and hope this helps and keep me posted, be glad to help.
Posted on Jun 14, 2009
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Posted on Jan 02, 2017
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