1994 Pontiac Grand Am SE 4Cyl When very hard on the - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-24-2013, 04:31 PM   #21
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I just don't understand why A TPS would cause it not to shift?
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Old 03-24-2013, 06:34 PM   #22
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The PCM needs to see certain values from many sensors in order for the transmission/engine to function properly. If the PCM seen a 100% throttle all the time, A. It would dump more fuel all the time, and B. It would change your shift patterns. And that'* just the tip of the ice berg. I could go on a lot longer on how each sensor has an effect on performance and even just the engine running. Did you know even a misfire condition will keep the cruise control from working?
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Old 03-24-2013, 06:44 PM   #23
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if it is a cable, kinda doubt but cable issues can cause weird shifting
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Old 03-24-2013, 06:48 PM   #24
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I still doubt he has the old style kick down cable. More than likely, he has the standard issue 4T60-E trans. And the shift lever sensor is mounted on the top of the trans at the end of the cable. If it were a sensor issue, he should get a CEL.
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Old 03-24-2013, 07:47 PM   #25
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What about the shake I get like a tire is spinning during heavy acceleration from a stop?
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Old 03-24-2013, 07:50 PM   #26
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Let'* work on one issue at a time please.
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Old 03-24-2013, 07:54 PM   #27
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Seriously? Wow ok I was just looking for a few more ideas to toss off the guys I work with. You had a few ideas but after that you are not sure so I asked of this other issue if anyone may have an idea for that as well
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Old 03-24-2013, 09:50 PM   #28
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See if car has internal problem I am just gonna sell it without putting more into it
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Old 03-24-2013, 10:23 PM   #29
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Did you change the trans oil and filter? Did you test the TPS like Colin suggested in post #17?
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Old 03-24-2013, 11:51 PM   #30
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Neither I will see if I have time tomorrow to do both
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