Question about 1994 Chevrolet S-10 Blazer

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I have a 1994 2wd blazer 4.3 vortec .it has poor idle,poor acceloration,have rebuilt fuel injetion and tested fuel pressure 65psi ,set timing. could ECM be reading wrong?or possible bad tps?

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  • fly_flybirdi Jun 29, 2009

    corrected idle. but no power improvement.



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I would install a new tps throttle postion sensor and then dive it 2 miles at 50 miles an hour to calibrate itself

Posted on Jun 22, 2009

  • nuttbysteve Jun 29, 2009

    i would check the exhaust temperature all a long the exhaust pipe with a non contact thermeter could be a plugged converter or even muffler


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Im going through the samething with my 94 s10 4.3 vortec my check engine light comes on and has been reading that its "tps circuit low voltage" which indicates a bad wire or ground somewhere becuase I repkaced my tps and the problem still persisted check the wires or they told my to look into a new "map" sensor

Posted on Jul 21, 2012


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Could be a vac leak or a problem with the EGR valve among other things. Fuel pressure regulator comes to mind too.
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I recently had similar symptoms from my Kia Rio, hard to start, bad idle in gear, etc.
Ended up being the idle air control valve, you can try cleaning yours with carb cleaner and see if there's any difference.
A clogged fuel filter can produce the same symptoms too, that might be the easiest thing to start with, then it's just a process of elimination from there.

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Then your best bet is to change the fuel pump. It must be too weak. You could have the pressure tested first, if you want to be sure. It has to be either that or a faulty idle control sensor.

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