Question about 2000 Chevrolet Malibu

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Extended shift time when hard on the throttle.

This is a 2000 Chevy Malibu, 3.1 V6 with Auto Trans. The problem I'm having is something with shifting. A long time ago it got to the point where even granny driving it, it did not want to shift. Rpm would go up and up with no shift. My mom took it to the dealer and all she told me was it was something with the fuel and air. That was when it was under warranty. Well now the car has about 94,000 miles and it will still happen a little bit. With the A/C off the car doesnt want to shift when you get on the throttle, I've learned to ease off the gas when its about to shift and it works good. Without the A/C on it runs a lot better and has more power. Maybe its just a quark to the car or transmission but its really annoying. I've changed the fluid in the trans at like 85,000, and it was not burned. I put 75k Plus fluid with the extras in it. The car is well maintained. I use only synthetic oil, it has a K&N Air filter. No leaks. I changed all the vacuum hoses, even the ones only by the dealer. It has new plugs, wires, and pcv valve. Cleaned the MAF sensor. No codes, even when it acts up. Do all malibus act like this ?

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  • Chevrolet Master
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I have read numurous things on the throttle position sensor, and if the tps is bad or out of adjustment it makes a big effect on how the transmission shifts.i am having the same problem with my 3.1. also the map sensor controls the fuel delivery and ignition timing!!

Posted on Sep 20, 2009

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My 2006 chevy malibu doesn't want to shift gears codes P0121 & P0101 & P0420 transmission place said it's not the transmission.


P0101....Mass or Volume Air Flow Circuit Range/Performance Problem
P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem.
P0420 - Catalyst System Low Efficiency
there is criteria that enable trans shift
solve codes problems then transmission will shift normaly

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Give this a shot, it often works and it's cheap enough to try.

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This whole process will drop the trans fluid temperature 40-50 degrees and often that's enough to get back into a temperature range that will allow the PCS to work reliably again.

If it doesn't work your not out much, if it does work you'll probably get another couple of years out of it.

Al







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Hard shifting


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