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Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 21543
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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How to fix the 96 chevy truck with idle to high

Resolved Question:

how to fix the 96 chevy truck with idle to high
Submitted: 3 years ago via GreatAutoHelp.
Category: Chevy
Expert:  JHoop replied 3 years ago.
Hello , my name is XXXXX XXXXX thank you for choosing justanswer.com. Please tell me all of the problem as my answers are based on the information you provide. Your satisfaction is my goal, and I'm happy to answer any follow-up questions you may have about the same problem.

What codes are in the computer?
Customer: replied 3 years ago.
no code
Expert:  JHoop replied 3 years ago.
You checked the codes with what tool?
Customer: replied 3 years ago.
no code at all
Expert:  JHoop replied 3 years ago.
OK. What scanner?
Customer: replied 3 years ago.
odb2
Expert:  JHoop replied 3 years ago.
I'm going to put your question back up and see if anybody else has any info on this. Sorry I couldn't help you further. I'm sure someone will be with you shortly. Please do not reply as it will lock me to your question and no other expert can answer you. Thanks again for choosing justanswer! JHoop
Expert:  Dan replied 3 years ago.
Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. You have replaced everything that should cause a high idle...IF no vacuum leaks then I'd replace the PCM/VCM. You can get a used pcm/vcm from www.car-parts.com to save money. Remove iac and manulally extend it to see if idle drops if so Disconnect the IAC and check the circuits. A #194 bulb works good for this test. Insert the two wires of the bulb into pins A and B of the IAC connector and start the engine. Turn the engine off and attach the bulb to pins C and D and restart the engine. If the bulb does not light on either test, check the wiring between the IAC and the Vehicle Control Module (VCM). Another equally effective test is to use the same 194 bulb with one terminal connected to ground. Check for a blinking power supply on all 4 wires when the engine is started and then shut off. Repeat with the 194 bulb connected to power and verify all 4 wires obtain a blinking ground when the engine is started and shut off. If any of the 4 wires do not indicate a blinking power or ground, verify the wiring between the VCM and the Idle Air Control (IAC) motor. If the circuits are good, replace the VCM. Let me know if you have questions, thanks.
Customer: replied 3 years ago.
where is the pcm
Expert:  Dan replied 3 years ago.
Here is a picture. Let me know if you have questions, thanks.

Vehicle Control Module 5.0L & 5.7L Engines Engine Compartment, LH Fender
Vehicle Control Module 5.7L Engine VCM Bracket Bolted To LH Radiator Support


http://db.tt/vNg3SMvb
Customer: replied 3 years ago.
do you have the picture for p30?
Expert:  Dan replied 3 years ago.
Here is a picture from a G30 which should be the same. Let me know if you have questions. Thanks.

http://db.tt/5KNM6QPY
Customer: replied 3 years ago.
did you say computer box?i changed too,still the same
Expert:  Dan replied 3 years ago.
Ok, then do test with bulb on iac wiring.....Sounds like you have replaced everything so at this point I think you may have a vacuum leak that was missed or wiring problem going to iac. Let me know if you have questions, thanks
Dan, Technician
Category: Chevy
Satisfied Customers: 21543
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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