1996 Chevy Blazer Idle Issues

Tiny
COMPUDAD76
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I have a 96 Chevy Blazer with the 4.3L Vortec
engine. When I start it, the engine instantly revs to around 2 - 2.5k rpms (way high) for about 5 seconds, then settles to around 500 (a little low from what I was told). When it's cold, it will usually stall if I even look at the gas pedal. After it warms up, it accelerates without hesitation.
While approaching a stop, and I let off the accelerator, it continues to run at around 1.5 - 2k rpms till I've made a complete stop, then chugs back down to 500 rpms, at the cost of major wear on the brake pads, and a bit of worry. There are no odd noises coming from the fuel pump. It does this cold and/or warm.
The plugs, wires, rotor, distributor cap, air filter, fuel filter, and fuel pressure regulator have all been changed. MASS sensor has been cleaned, along with all sensors connected to the intake plenum (new gaskets) and the air intake assembly. Starts quicker, but other than that there is no change.
It has been recommended to me to get a new idle air control sensor. Could that possibly be the cause of my rpm control problems? Or is it something else?
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Wednesday, March 24th, 2010 AT 11:30 PM

3 Replies

Tiny
RASMATAZ
  • MEMBER
Hi compudad76, welcome to 2carpros and TY for the donation

Clean out the idle air control valve and test the throttle position sensor-get back with me
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Thursday, March 25th, 2010 AT 12:27 AM
Tiny
COMPUDAD76
  • MEMBER
Replaced both the idle air control and the throttle position sensor. Problem solved. Thank you very much for the advice!
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Wednesday, March 31st, 2010 AT 11:02 PM
Tiny
2CARPROS LINSEY
  • MEMBER
Hi compudad76,

Thank you for using 2CarPros. Com. We appreciate your donation and look forward to helping you in the future.
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Thursday, April 1st, 2010 AT 5:31 PM

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