2003 Chevrolet Impala Logo

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Anonymous
Anonymous Posted on Apr 16, 2012
Answered

Idle air controller ver noisy ive never heard one make that much noise also sets po 121 then stalls

Tps reads 2.5 volts at around 51 percent

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  • Anonymous Apr 18, 2012

    ok here is a update the iac was really dirty so i cleaned it nd cleared the codes then ran it it popped a po122 so as soon as weather clears up i will do all my volt ohm meter checks and repost.

  • Anonymous Apr 21, 2012

    base idle was out of adjustment and the idle air controller is unserviceable idle sticking at 1100 to 2100 rpm then down to 750 rpms and tps was not installed properly and arm inside was bent have tested all sensors iac would not respond to functional test with mtg 2500 scan tool . I also found a mouses nest in the air box which covered the pcm which i cleaned out but i wonder if it was overheating the pcm by being insulated by the nest thank you for your help i will keep posting my details and solutions.

  • Anonymous Apr 22, 2012

    ok replaced iac still geting hi idle but changes everytime i restart it then eventualy it drops to 750 but some times if i snap the throttle it will drop back down but only to 1100 then i can cut it off and restart it and then it will idle at 750 rpm no codes and no driveability problems.

  • Anonymous Apr 24, 2012

    ok found a cracked map replaced it still same problem unhooked iat sensor and and it calmed down then gradually climbed back up to 1500 ive checked every sensor wiggled every harness sprayed every where found no leaks no codes manifold vacum is 20 hg ran with maf unhooked went right to 2500 rpm air filter is clean checked my grounds and they are good any ideas.

  • Anonymous Jun 15, 2012

    ok this is solved the pcm posted no dtcs and in the proces of testing around the pcm and found numerous mechanical problems which were then fixed in the end the pcm was bad which was my initial diagnosis but it had a bad tps and iac as well as the upper intake being unservicable leaking coolant and vacum also the throttl body had to be removed and cleaned 6 hours later it was spotles i greatly appriceate all the help from the fixya members so i wanted to make sure i posted the solution for this problem .Douglas Bean.

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montehammons

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  • Chevrolet Master 5,531 Answers
  • Posted on Jun 16, 2012
montehammons
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Tps adjustment
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typically this vehicle utilizes a map sensor or what is known as a speed density system the vac operated devices that draw enough to cause it to stall are the 1. brake booster 2. pcv system 3.any of the rest of them would cause a fluctuating idle but the pcm could compensate we know the idle air control system is working because the idle surges so i would first remove the fresh air hose from the throttlebody the dry dirt around the butterfly valve accumulates chocking the airflow off and causes a low idle this is known as coking and is very common also check for EGR codes if egr solenoids 1 or 1,2 or 2 or 3 are stuck open this will cause a low unstable idle or stall and the tps voltage at idle should be checked 3 wires 1 wire should be ground 0.v 2nd wire should have a 5v reference and third wire is what is known as signal return it should read at idle around .5v to 1.v if it is not in this range then it will cause the same symptoms
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Trouble Code 22 indicates that the Throttle Position Sensor (TPS) is reading abnormally low. TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT.
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I'm assuming you have the 3.3l v-6. When I look up the part, it seems to have slotted holes. Therefore, it is designed to be adjusted after installation. If your tps has these slotted bolt holes, adjust it to satisfy the settings in the test procedure below.
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My 99 suburban idles at 1000 rpm in park with a new TPS at operating temp. What is the factory idle setting? how do I adjust rpm?
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As a factory Nissan trained Technician with dealership experience - it can be many things, but it sounds alot like a mis-adjusted or faulty TPS, and/or a faulty IAC(Idle air control) valve - I'd try the TPS and set to appx. .50 vdc (.47/.49) Volts DC and if that isn't it, I'd definitely look to the idle air control valve ( allows for air bypass - sometimes called bypass air control valve). May then need base timing and idle set at shop with OBDII ignition disabling option, for seting timing and idle, otherwise computer won't allow proper setting...then if connector to IAC is OK - should be just fine...
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