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#1
04-03-2007, 08:43 PM
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1991 Chevy Lumina
Hello I have a 91 Lumina 3.1 Sedan with 104,000 original miles. Recently while driving the car will just randomly start shifting up and down while driving. I will have my foot on the gas going like 35mph and then the speedometer will jump to like 45mph to 15mph then to 45 mph again and then 15mph then back to normal. Then when coming to a stop i can hear the car engine very highly idling. Then I shut the car off and turn it on again and the high idling is gone. Recently in the past 3 months I have had the transmission rebuilt with new torque converter replaced because when coming to a stop the car would stall and then would start however would want to stall again unless the floored the car to keep it going. Also recently I had a vacuum hose replaced because the car kept stalling when coming to coming to a complete stop. Also around the time I had the vaccum host replaced which was last week the car when it was stalling would feel like it would want to jump forward when I was sitting at a light with my foot on the gas. Haven't seen this recently after replacing the vacuum hose though but the random shifting has been on again off again since getting the transmission replaced and it was not there before hand.
Any insight would be most appreciated thanks 
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#2
04-04-2007, 08:43 AM
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Re: 1991 Chevy Lumina
Welcome to AF. Check for loose connections around the pcm, also try tapping it firmly with a screw driver handle see if any response. Check the grounds on the engine block also.
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#3
04-04-2007, 08:59 AM
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Re: 1991 Chevy Lumina
A new TPS may fix the idle symptoms, check the connection to the VSS on the tranny also...did they reuse the old VSS?
Really, it sounds like the shop that did the tranny needs to look into this...
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You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#4
04-06-2007, 11:41 PM
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Re: 1991 Chevy Lumina
Thanks for the info guys took the car to the trans shop yesterday cause the trans is under warrenty and they said it was engine so I had it towed to my local mechinic and they replaced the ECM and the random shifting is gone however now when i shut down the car now there is like the whiring clicking sound coming from the glove compartment area for like 8 seconds then it stops is that the new ECM working or something else?
Thanks
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