jeep comes in has a stalling prob.  hook it up and has numerous codes but only has to do with the stalling.  po505.  i let it run with a moniter in the pids and a graph of the iac actions.  never died or anything until i wiggled wiring at the back of the head coming out of the back of the injector harness insulator.  by the way this is a 4.0L.  i grab the harness and start feeling and find that the head stud had wore into the insutlation and started in on the brown w/white tracer wire.  the wire was grounding against the head stud very intermittently. while running i noticed the iac target and actual steps would go clear down to 0.  not right.  fixed the wiring and everything went back to normal.

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Tip: iac wiring
Vehicle: 2004 Jeep Grand Cherokee Limited
Category/Subcategory: Engine Performance / Testing and Diagnostics
Title/Heading: POWERTRAIN DIAGNOSTIC PROCEDURES / Symptom: P0505-IDLE AIR CONTROL MOTOR CIRCUITS
Posted By: diesel man
Shop: BRADS REBUILD
Date: 3/12/2009

This entry was posted on Wednesday, April 15th, 2009 at 4:35 pm and is filed under March 2009 Winners. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.