Question about Chevrolet Impala

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I have a 2008 chevy impala, I have had the throttle body replaced and it is still giving me the P2138 code. It also seems to run very high idle sometimes when I am driving it like the engine is reving up. Could this all be from the Throttel position sensor.

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  • 118 Answers

Sounds like an accelerator pedal problem. Replace you gas pedal, it has a sensor which measures how far the pedal is depressed and opens the throtle accordingly.

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

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Charlie1221
  • 61 Answers

SOURCE: Check engine light is on and high idle (1500rpm)

Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.

Please contact me if your problem presists.
Thanks, Charlie

Posted on Feb 03, 2009

  • 64 Answers

SOURCE: 1999 volkswagen stalled

first check cylinder 1 , spark plug, ht leads, coil,

then clean the trottle body with carb cleaner

if that does not work replace the throttle body, comes complete, and do a basic setting on it with diagnostic machine

Posted on Feb 19, 2009

  • 3 Answers

SOURCE: 2004 Honda Civic -Code P0122 Throttle Position Sensor Voltage Low

yes, this is the case of a failed throttle body, in which case it needs replaced, the car is getting too much fuel causing the high idle. this needs replaced asap. you could proably find a small independant honda shop that could do the work for less.

Posted on May 12, 2009

  • 11 Answers

SOURCE: on a 04 camry with 2.4 ltr engine, can I replace

I think the terms "Throttle Positon Sensor", TPS and "Throttle Body" can be misleading at least in regards to the 04 Camry.

My 04 Camry gave a diagnostic reading of P2121 for my problem "Throttle PEDAL position switch D circuit". However, we changed out the complete Throttle Body/TPS (Toyota Part #22030-0H020) that did NOT fix problem.

The 04 Camry TPS Electronic Module "Throttle Positon Sensor" is factory assembled and riveted to the side of the throttle body. The only way to service/inspect it would be to cut off or drill out the rivets. Not sure you could open the darn thing if you got it off, but that seems to be the only way Toyota sells them!!

Hopefully a new Throttle PEDAL Position Sensor (Toyota Part # 78010-33010 PEDAL ASSY, ACC)
will fix it. This is located under the dash near the accelerator pedal.

So, now I would recommend FIRST to replace the "Throttle PEDAL Positon Sensor" (it is much, much cheaper) and then the Throttle Body/TPS assembly!! Unless of course, you get a diagnostic code as you did for "faulty throttle body!!


Posted on Jan 21, 2010

  • 2 Answers

SOURCE: 2001 nissan frontier 3.3L idle problem

if the knock sensor hears to much noise it will change the timing to get rid of any knock heard. if the sensor is going bad it can give false readings and randomly change the timing wich will in turn change the idle.

Posted on Mar 02, 2010

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Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up.
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