Joined
·
171 Posts
Does anyone know how to retract the IACM on a 1994 3.3L engine?
It is a stepper motor with two windings which IIRC is typical of stepper motors, but Chrysler manuals do not detail other than four "driver" connections to the ECM.
Mine protrudes 1 1/8" whereas the factory service manual says should not be more than 1", their fix is to use their scan tool to command retraction. Cannot just turn the pintle to retract.
The longer length fits in to my throttle body but I am having intermittent run-rich loss of power, stalling, and failure to start. (I cleaned it and put all back together, started fine a few times though code 52 set (O2 sensing mixture too rich, previously had code 13, I reset Adaptive Learn values), drove around the block OK, then after sitting for a couple of hours would not start - engine ignites but won't run when starter released. Experience before some cleaning was operation troubled then suddenly OK.
(The IACM ports air past the throttle plate to control mixture and idle speed in some bizarre fashion.)
I will take the entire throttle body out and clean more thoroughly.
It is a stepper motor with two windings which IIRC is typical of stepper motors, but Chrysler manuals do not detail other than four "driver" connections to the ECM.
Mine protrudes 1 1/8" whereas the factory service manual says should not be more than 1", their fix is to use their scan tool to command retraction. Cannot just turn the pintle to retract.
The longer length fits in to my throttle body but I am having intermittent run-rich loss of power, stalling, and failure to start. (I cleaned it and put all back together, started fine a few times though code 52 set (O2 sensing mixture too rich, previously had code 13, I reset Adaptive Learn values), drove around the block OK, then after sitting for a couple of hours would not start - engine ignites but won't run when starter released. Experience before some cleaning was operation troubled then suddenly OK.
(The IACM ports air past the throttle plate to control mixture and idle speed in some bizarre fashion.)
I will take the entire throttle body out and clean more thoroughly.