1994 Chevy Blazer Throttle position sensor

1994 CHEVROLET BLAZER
230,000 MILES • 6 CYL • 2WD • AUTOMATIC
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LESPAUL71
  • MEMBER
  • 1 POST
My engine has been idling ruff lately and smells rich, and has been revving by itself when I'm sitting at a redlight, so I tested the TPS, which tested bad. When I replaced it, it stopped the revving, but my transmission wouldn't sift right. It would take forever to shift out of first, and when it did, it slammed into second. Also, just changing between park and drive would make the car shutter. So I figured it was a bad part. I took it back, got another one, then tried again. Well, the new part does the same thing. My gear shifting is hard pressed and erratic. When I put the old one back on, my other problems came back, but the transmission shifted fine. What am I doing wrong??
Thanks in advance,
Mark
Feb 27, 2008 at 8:54 AM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
You need to go to the dealer have them set the PCM to "learn idle" if you change a tps this must be done!
Feb 27, 2008 at 9:35 AM
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