| Initially I posted this procedure using carb cleaner but after a few months the erratic idle returned. Using WD-40 seems to work much better. It appears to provide a light lubricant that will keep the moving parts operating smoothly for a long time. Here is the procedure: 1. Remove the red extender from the WD-40. Remove the hose from the IACV. The hose is a 90 degree elbo located on the IACV just above the idle air adjusting screw near the brake master cylinder. Barely put the hose back on (about 1/8 inch) with the red extender under it about an inch. It will be pointing away from the IACV. Hook up the WD-40 can to the red extender. Start the engine. 2. While waiting for the engine to warm up give it a few shots of WD-40. This should help treat the air regulator. (Air regulator is what revs up a cold engine. If it's shutter is sticking, it will cause low idle/stalling when cold or high idle of 1800 to 2000 rpm when warm.)
3. After the engine is warmed up. Give it a very short squirt. Engine will try to die but should come back. Do this about 10 times. That treatment and rpm cycles should clean it out. 4. You can do it again with the air conditioning on to also treat the FICD (FICD raises idle with air on). WD-40 seems magical. It will clean the moving parts and leave a light lubricant that does not attract dirt. This treatment will solve the most common idle problems.
Other causes could be IAA connections/IAA malfunction, intake/vacuums leaks, TPS connections/adjustment, or throttle linkage hangup. If you have trouble finding the proper hose connection see green dot here:
[ http://www.twinturbo.net/ttnettech/iaa/iaa3.jpg ] or read step 3 in FAQ "How do I replace the Idle Air Adjusting (IAA) unit?" located here:
[ http://www.twinturbo.net/ttnettech/iaa/iaa.html ] For more info about the IAA unit/air regulator and how to rebuild, see tech article by Z Viking here:
[ [ http://home.swipnet.se/e-solutions/IdleTech.html ] ]
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10:22:49 12/31/02
