Question about 2003 GMC Sierra 2500HD

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Truck starts fine but stumbles at idle and stalls out whenever i give it any gas. This happened over night yesterday. I've changed plugs and wires and checked all the coils. I've changed MAF sensor. Checked oxygen sensors and cats are good. OBD codes 102, 171, 174, 300, 327 and 1514. Codes 171, 174 and 327 have been there for months. The others showed up yesterday when this problem appeared all of a sudden. A mechanic friend sugguested that the throttle position sensor might be bad, but i found that the truck doesn't have one. could the acceleratoe pedal position sensor casue the same problem? Any help?

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  • mechanic144 Apr 15, 2017

    sounds more like the air idle speed motor, or some call it the idle air control motor. locate it. should be somewhere on the throttle body. unplug it, and check pins on the sensor it self and see if it plugged in tight, if so, removed the motor itself. it should be nice and clean. if its all dirty with carbon deposits, looks like soot in a fireplace, use some brake and parts cleaner and clean it up real good. while cleaning, check the spring on the pintle (the part that moves in an out) if its broken, this could be the reason it would idle as it has no way to control incoming air to the throttle body. id start with that first and go from there...

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Maybe

Posted on Apr 15, 2017

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: codes #171 & 174

first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Posted on Jan 05, 2009

  • 147 Answers

SOURCE: codes 171 and 174 2001 ford winstar

dont take soo much in consideration after you have make all this things, some time is on only for any wire faulty, or a shrt electrical arc in any place in wire system. ask auto tap mechsnics for this maybe they have similar case before.

Posted on Apr 06, 2009

mkv0525
  • 358 Answers

SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive

ou need to check compression on all the cly. do you know which cly is dead?

Posted on Jun 12, 2009

  • 32 Answers

SOURCE: 98 chevy lumina. Code 113, 102, 171. runs then

the code 113 is intake air temp cicuit, high input.
the code 102 is mass air flow volume air flow circuit, low input.
the code 171 is system too lean (bank 1)
I sure hope this helps you out. Dont sound like anything too major though

Posted on Sep 24, 2009

  • 126 Answers

SOURCE: check engine light on computer codes 171 174

switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.

Posted on Nov 03, 2009

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