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Old 12-02-2012, 10:10 AM
spazzz96 spazzz96 is offline
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Default Rough idle at low rpm. No check engine light.

Hey everyone. I have been having a rough idle at low rpm for as long as I have owned the car. I bought it 2 and a half years ago with 34k miles. Now has 85k. I noticed it a few days after I bought the car. It idles rough at 500-700 rpm. Feels like there is a miss fire I have been told by a mechanic and a couple friends but I can't figure out how to get rid of it. Otherwise it runs fine and iv never had it shut off on me but it has bogged down to 100-200 Rpms a few times. There is no check engine light. I figure it will be fine for a few more years but I just don't want it to lead to bigger problems down the road.

This is what I have done for the rough idle.
Changed spark plugs and wires with proper gaps.
New mass airflow sensor when it went bad on its own.
Compression is great according to mechanic.
Sea foam treatment.

Any ideas on what I can do?


Iv read it can be sticky valves but that's expensive to fix.
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  #2  
Old 12-04-2012, 06:52 PM
rangerlocal rangerlocal is offline
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Join Date: Aug 2012
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Default Re: Rough idle at low rpm. No check engine light.

Clean the IAC valve. They are almost always dirty and attribute to 75% of all idle problems. Since your RPMs aren't hanging or high, I'll assume you don't have any substantial vacuum leaks.
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2000 Ranger XL, 2WD, 3.0l, 3.73 rear, 10" rear drum ABS, standard cab, long bed, A/C, 4r44e auto trans w/transgo shift kit, throttle cable mod, air box silencer mod, rear sway bar retrofit, white grill swap, CURT hitch, Westin step bars
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