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Post by fredwinterburn on May 22, 2022 13:34:13 GMT -6
My 97 Aurora at 150,000 km had developed a very subtle miss as if it were running too lean at times. Power was down at times and inconsistent almost as if the fuel filter was plugging, or dirty injectors or weak ignition, or perhaps water in the gas. Except that it was more likely to happen at low engine load which more or less ruled out those other potential causes (except for water in the gas). Finally, it started to have wholesale misfires at two separate throttle positions. No codes were generated. I changed the throttle position sensor and this resolved the problem. This is the 3rd vehicle I have owned where this has happened with no check engine light or code to show the TPS was failing. The first time I experienced this was on my wife's 1985 Olds Calais and the second time on my 04 Jeep Grand Cherokee. I replaced the original GM part with an NTK part (12 bucks CDN) from Rock Auto. It's held in with two T25 torx screws. The bottom screw is a little awkward to reach ( don't drop the screws!) but otherwise easy to change on this car. Consider the TPS, which is really just a well made potentiometer, as a wear item and change it every 100,000 km or 60,000 miles. The ECU will take a few miles to adjust to the new TPS, but it should sort itself out in less than 20 miles. Fred
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Post by AuroraGirlFromMars on May 24, 2022 2:23:38 GMT -6
 same concept i think the 4.0 and 4.6s had their own version |
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Post by jimrockford007 on Jun 11, 2022 17:58:49 GMT -6
This is funny I bought an Oldsmobile 98 Touring sedan I believe it was a 1987 and it ran poorly and I wound up diagnosing as a bad TPS sensor so I ordered one and lo and behold when I got it installed it the car ran even worse so I got to check in and doing some test and the motherfuker wound up being completely backwards the reading I was should have it Idle was it wide open throttle and the reason I was having it wide open throttle should have been the idle I sent it back to RockAuto and they sent me another one and that one worked but it was all that I've never run into anything like that before to where the motherfuker was completely backwards
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Post by AuroraGirlFromMars on Jun 14, 2022 2:01:43 GMT -6
This is funny I bought an Oldsmobile 98 Touring sedan I believe it was a 1987 and it ran poorly and I wound up diagnosing as a bad TPS sensor so I ordered one and lo and behold when I got it installed it the car ran even worse so I got to check in and doing some test and the motherfuker wound up being completely backwards the reading I was should have it Idol was it wide open throttle and the reason I was having it wide open throttle should have been the idle I sent it back to RockAuto and they sent me another one and that one worked but it was all that I've never run into anything like that before to where the motherfuker was completely backwards A 1987 either had an adjustable TPS or the TPS voltages were adjustable and had to be set within proper set points. Was it a 3.8l FWD car? or 3.3/3.0 car? |
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Post by jimrockford007 on Nov 10, 2022 19:00:35 GMT -6
it wasnt out of Adjustment, It was backwards. almost 5 volts at idle and .45 wide open like I said I've never seen anything to beat that. New sensor I installed tested out perfect . I've been into Computer controlled cars since they came out in the early 80's when everyone else was cussing them I was learning to live with them. I've been working on cars nearly 40 years . I"m not your average shadetree.
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