When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a 2000 Ford Ranger 4x4 3.0 with a Gibson exhaust. I have noticed that sometimes if I let it idle for awhile, maybe 5-10 minutes and then accelerate briskly to a stoplight or stop sign, when I stop the idle will drop down to about 500 rpm then quickly jump back up to its normal idle of 900-1000 rpm. The motor never dies it is just unusual to me. Is this a serious problem or could it be the exhaust relieves to much backpressure? Any input would be helpful.
I don't think it's a major problem, it might just be the IAC sticking a little under those conditions. You could pull it and see if it's dirty. I have a 2000 2wd 3.0 with a Gibson and have never noticed that but I only have 21k miles and I don't normally let it idle that long.
[updated:LAST EDITED ON 12-Sep-02 AT 03:35 PM (EST)]It's not a stupid question. The IAC is the Idle Air Control valve, it's right on top of the throttle body. It looks like a file canister and has a red and white wire going to it. When you open the hood it's right in the middle looking at you. mechanicmatt.com has a page on cleaning, I'm not sure if it applies directly to the current type.