Cleaning IAC
#1
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Join Date: Oct 2011
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Year: 1999
Model: Cherokee
Engine: 4.0
Cleaning IAC
Hi. I pulled the IAC out of my 1999 GC 4.0, and sprayed it with brake cleaned and scrubbed the crud off of it. I kinda rushed through it because I was pressed for time. I also cleaned the passage that is goes in on the throttle body. I am still having problems with it idling. I was wondering if I should have worked the plunger in and out or not, or if it's just beyond cleaning.
#2
CF Veteran
Brake Cleaner, hmm? What did you use to wipe or scrub inside the bore? You really need to use Throttle Body Cleaner and a soft cloth or wood-handled soft bristled brush to clean the throttle bore, the underside and edges of the throttle-blade, the IAC and its bore, etc. And no, you should not physically manipulate the "pintle" of your IAC when cleaning but you can verify IAC actuation/function on the bench using ~4.5Vdc (three D-cell batteries plus a low value resistor or flashlight bulb in-series). It might be broken but you can prove it if you take your time...
#3
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Year: 1999
Model: Cherokee
Engine: 4.0
Brake cleaner worked great. Got it nice and clean, scrubbed with a toothbrush and rag. Cleaned the bore and the throttle body. Jeep runs and idles perfect now. I didn't force the pintle at all.