IACV - High Idle - Measurement
#1
IACV - High Idle - Measurement
Ok, so I've been driving the Land Pig daily now for about a year. 120 miles a day M-F for about two months lately. No real issues until now.
Start it up Saturday and it revs up to about 2,000. Drove it the weekend like that. Monday I take the IACV out, clean it and TB. Not terrible bad dirty. Measured distance from bottom of pintle to step/collar. Right at 12mm. Did this before I cleaned it. Remeasured and put back in. Fired it up and idled right at 700. Groovy! Not really.
Next start up revs right back up to 2,000. Take it back out. Still at 12mm. Picked new one (Jeep) up at parts house. Adjusted it to 12mm. Put it in. Same result. First start idles at 700. Off and start back up and 2,000 again.
No codes. TPS at 12%. IAT and Coolant Temp same as ambient (cold engine). Now if I jam it in gear, R or D, idle will come back down to 1,000 and if I turn A/C on it rpm jumps just a bit and returns to 1,000 when A/C is off.
Do I need to find a COMPETENT independent shop to get the adaptive values reset?
Start it up Saturday and it revs up to about 2,000. Drove it the weekend like that. Monday I take the IACV out, clean it and TB. Not terrible bad dirty. Measured distance from bottom of pintle to step/collar. Right at 12mm. Did this before I cleaned it. Remeasured and put back in. Fired it up and idled right at 700. Groovy! Not really.
Next start up revs right back up to 2,000. Take it back out. Still at 12mm. Picked new one (Jeep) up at parts house. Adjusted it to 12mm. Put it in. Same result. First start idles at 700. Off and start back up and 2,000 again.
No codes. TPS at 12%. IAT and Coolant Temp same as ambient (cold engine). Now if I jam it in gear, R or D, idle will come back down to 1,000 and if I turn A/C on it rpm jumps just a bit and returns to 1,000 when A/C is off.
Do I need to find a COMPETENT independent shop to get the adaptive values reset?
#3
#4
I second the "yes" but also agree that something might have caused the ECU to lose it's setting. PCV system, intake, vacuum lines. Double check that they're in good shape, working/open and cinched down. Also check the ECU's connector and the IACV's for water intrusion, dielectric grease pins. Try this, give the new IACV a little more length like 13mm and see if that makes any difference. The pintle should sit on the plenums seat and only crack open enough to give you the balance of air around the throttle plate to hit the 650-700 mark.
#5
Thanks all for the replies. Going to tinker some more over the weekend.
Two weeks ago replaced both PCV hoses and cleaned the silly little baffle thingy on the right.
Have a nagging suspicion it might be related to the hard line that goes back to the emission crap.
Two weeks ago replaced both PCV hoses and cleaned the silly little baffle thingy on the right.
Have a nagging suspicion it might be related to the hard line that goes back to the emission crap.
Last edited by hrhoward; 01-27-2017 at 09:29 PM. Reason: grammer checker
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