TPS sensor?

Tiny
SYEAGER1
  • MEMBER
  • 1994 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 153,000 MILES
I have a 1994 chevy s10 blazer 4.3 engine 4x4. It runs really rough and for awhile I had no real power when I stepped on the gas. And when I reached 15 mph I had to let off the gas so the car would switch into the next gear and again at about 30. So I changed the throttle sensor but now it wont change gears like it use to now it revs up real high till like about 21mph then jerks into gear and again at 43mph. And if I let off the gas when its at like 3 and a half rpms its drops down but then when I give it gas again it shoots right back up till it gets to wear its wants to switch. I feel like im gonna blow my engine and waste a ton of gas till I fix it. I think it may be a sensor since it started to happen right after I replaced the throttle sensor but it could be anything. Can you help?
Friday, May 27th, 2011 AT 4:44 PM

6 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
How was TPS adjustment done?
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Friday, May 27th, 2011 AT 5:06 PM
Tiny
SYEAGER1
  • MEMBER
  • 6 POSTS
WHAT IS TPS is that the timing on the firing order cause I didnt do that.
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Tuesday, May 31st, 2011 AT 12:24 PM
Tiny
SYEAGER1
  • MEMBER
  • 6 POSTS
Throttle position sensor. I dunno I did it myself I just unbolted and rebolted the new one one I didnt know I had to adjust anything.
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Tuesday, May 31st, 2011 AT 1:11 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
TPS adjustment need volt meter use paper clips to back prob two terminals on TPS Dark Blue and Black wire attach meter pos. + To dark blue and Neg.- To black. Turn key on engine off voltage should read.85 VDC then slowely open throttle all the way smooth rise to 5VDC.
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Tuesday, May 31st, 2011 AT 6:56 PM
Tiny
SYEAGER1
  • MEMBER
  • 6 POSTS
Ok we checked that it read 5 although there were 3 wired a light blue one a black one and a yellowish one. But anyway there are 2 other sensors right by the TPS. Theres a circular one the the left of the mannifold and then theres like a flat lookin one right behind the throttle sensor. Ive been looking aline everywhere but cant find what there are. Could you tell me what they are so that I can replace them maybe thats the problem. I mean the car is old and im sure no1 has changed anything on the car at all.
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Wednesday, June 1st, 2011 AT 6:23 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Use TPS wiring diagram to do adjustment also see throttle body
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Wednesday, June 1st, 2011 AT 6:31 PM

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