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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 01-20-2008, 03:14 PM   #1, where our google ads make absolutely no sense!
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b18c1 cold idle problem

Engine is a b18c1 using a vafc 2 for a fuel controller. It idles at about 2700 rpm when you first start it up (cold start), then when it starts to warm up the idle will fluctuate between 1200-1700 rpm, then finally after it warms up, has a perfect idle around 800.
Any ideas what could be causing the problem?
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Old 01-20-2008, 04:10 PM   #2, where our google ads make absolutely no sense!
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Think i may have found out what the problem is...
Gonna give it a try.
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Old 02-03-2008, 10:04 AM   #3
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if anything, I would look into replacing the hose that passes coolant underneath the throttle body, it was pinched once, I fixed it but didn't buy a new hose and that could be a problem.. but I doubt it since if that is plugged the idle will NOT drop past 1500rpm for more than 30 seconds at every stop light. just a thing to check.
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Old 08-31-2009, 08:10 PM   #4
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Had the same thing happon on my lude. There is an iac that controles cold idle its the smaller of the two on the throtle body. There is a plastic diaphram that backs off over time. Remove the valve and screw it in clockwise. should stop the serging idle.
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