2000 Chevy Malibu RPM's race tranny doesnt shift dont lose

Tiny
JADEZXY
  • MEMBER
  • 2000 CHEVROLET MALIBU
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 112,000 MILES
I will be driving down the street and have great pick up the rpms keep going up in up and the tranny doesnt shif into 2nd gear. It doesnt act like a normal transmission problem where you lose acceleration and power. It goes up to 60 mph just as smooth as ever just the rpms are racing is this a tranny problem a sensore or a crank shft sensor. I have been told all 3. Need to know which it is? Sensors are much cheaper than new tranny. I am a woman so they think they can get over on me. I dont think this is a typical tranny problem? Please advise?
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Saturday, February 13th, 2010 AT 3:14 PM

6 Replies

Tiny
BASSTECH
  • MEMBER
Trans problem can go either way. It could be sensor related, it sounds like a speed sensor issue on the transmission. Is the check engine light on at all? Don't let the RPM's get to high for to long while driving or you could ruin the engine. Let me know about the light
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Sunday, February 14th, 2010 AT 2:59 PM
Tiny
JADEZXY
  • MEMBER
No the check engine light does not come on. This happened after I replaced the mass air sensor.
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Monday, February 15th, 2010 AT 11:26 AM
Tiny
JADEZXY
  • MEMBER
My son has been driving it and he said light will come on n off comes on one day and off the next. He took it to put it on computer and only thing came up on computer was throttle positioning sensor. I guess the speed sesnors never showed up as bad. This all happened whe I changed my mass air flow sensor. I got it from Auto Zone and did it myself!
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Monday, February 15th, 2010 AT 12:12 PM
Tiny
BASSTECH
  • MEMBER
Well the T.P.S. Sensor that came up on the diagnostics can have a profound effect on the way the vehicle shifts and performs. They are also relatively easy to do. Why did you replace the mass air flow sensor?
If your getting a code for the TPS I'd start there.
Let me know how you make out.
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Monday, February 15th, 2010 AT 1:32 PM
Tiny
JADEZXY
  • MEMBER
Thank you so much. I changed the mass air because it was hesitating and surging. I took it to a neighborhood garage and being a woman I think they thought I did not know much. At any rate the man there unhooked the mass air and it drove fine, no more bucking. He told me that it needed changed. Well the price they wanted was outrageous so I bought one myself and under the direction of my brother in law changed it myself. It worked for a few days then started again so I changed the cvr or whatever it is called and that took care of the problem. Then I noticed the other problem I described. I dont think the mass air was bad at all now. I think it was the cgr cvr valve the little metal piece on top the motor. I hope this makes sense. I have a firend who is going to put the tps on for me. Could you tell me where that is located on the car. Also just exactly does this sensor do. I had a strong feeling from the way it drives it was not the tranny but some sort of sensor. Normally when the tranny is bad just before it is to shift it will bog down or go no more in speed my car will go up in spped smoothly no problems. Oh and no the light was not on when he told me mass air was bad. I was taken on that part I am sure.
Thank you so much!
Have a great day
Debbie
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Tuesday, February 16th, 2010 AT 1:23 PM
Tiny
BASSTECH
  • MEMBER
Hi Debbie. The TPS pretty much tell the computer where your foot is on the acclerator. If your at 10%.34%. Etc then takes that info and forwards it (so to speak) to the trans computer then the trans deciedes when to shift pretty much based on the accel. Input, So, if the TPS is bad, incorrect reading, the trans will shift funny or won't know when to shift. As far as where it is?
If you have already done the mass air flow sensor, just follow the big air duct down to the engine. Where that connects to is the thottle body, the TPS is attached to the thottle body assy. On the other side of the accel. Cables. I'm sure once you buy it and have it in your hand and look at the thottle body you'll see it easily. It should have 2 bolts and 1 connector. Let me know how you make out. Thanks
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Tuesday, February 16th, 2010 AT 1:39 PM

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