For this 2001 model V6~4.0L~SOHC engine assembled on 2000.0819, the AirIntake IdleAutoControlValve\IACV,
image above, is in easy view+reach behind the Throttle, atop the Manifold throat. The ECM\ECU\PCM computer
controls StartingFlare RPMs via this valve, depending on valve SetScrew adjustment, & targets specific WarmUp
RPMs. The soft rubber FactorySeal over the SetScrew may be removed with a razor knife for adjustments; RTV
may be used to make a new seal once adjustments are done. Periodic removal+cleaning of the IACV with spray
CarbCleaner & a soft bristle brush is recommended; also inspect+lube the Figure8 ORing & replace as needed.
The flange MountingBolts are 8mmHexHeads; the SetScrew is a 5mmAllenHead. Listed below are my own IACV
SetScrew adjustments which lowered engine StartingFlare by approximately 500rpms; this was done in an effort
to generally minmize engine wear during starts, specificly to reduce wear on TimingChain+Guide components.
Links To Related Info
Thanks go to the brave souls who've preceded me in similar adventures & freely shared their experience below:
- http://youtu.be/ayjhL9jpFH8?t=1 IACValve Diagnos
- http://youtu.be/bdVwQFgZatU?t=1 IACValve Cleaning
- http://www.ranger-forums.com/how-diy-submissions-59/how-clean-iac-idle-air-control-valve-142103 IACValve Cleaning
- https://www.explorerforum.com/forums/threads/shoc-remanufactured-engine-with-pre-oiler-timing-guide-reliability.473492/page-2 IACValve StartingFlareFix