Low Idle
#1
Low Idle
Greetings everyone. I posted a while back about replacing the shocks on my 96 1500. I'm here to seek advice for a new 'issue'. Basically, when the truck (360ci) is in any gear other than Park or Neutral, it idles fine when the motor is cold. Once it's warmed up and in gear (at a stop-light, etc.) the motor idles significantly lower than I can imagine it should. It doesn't idle rough...just rather low. The plugs, wires, and cap & rotor have just been replaced a week or so ago, and it didn't fix it. I was thinking a dirty/bad IAC valve, but if anyone else has a better opinion, I would love to hear it!
#4
idle speed is controlled mostly by the IAC, with a little interaction with the TPS. when the TPS says you are no longer mashing the gas pedal, the PCM tells the IAC to move in or out to run a slower or faster idle. the PCM measures the result from the crankshaft position sensor.
you did a tune up of plugs, wire, cap, rotor - so that takes care of the ignition system.
next - remove the IAC from the back of the throttle body and clean the pintle and the well it goes into. spray it all out with brake cleaner. poke a wire or small screwdriver through the little hole in the bottom of the well.
don't push, pull, or twist the pintle. you'll break it.
if that doesn't fix it, you can blindly replace it. keep the old one as a spare.
you did a tune up of plugs, wire, cap, rotor - so that takes care of the ignition system.
next - remove the IAC from the back of the throttle body and clean the pintle and the well it goes into. spray it all out with brake cleaner. poke a wire or small screwdriver through the little hole in the bottom of the well.
don't push, pull, or twist the pintle. you'll break it.
if that doesn't fix it, you can blindly replace it. keep the old one as a spare.
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Not to mention you can check the plenum gasket.
Here's a DIY for cleaning the IAC. And as stated, remove the negative battery cable first.
https://dodgeforum.com/forum/dodge-r...n-the-iac.html