1997 4.0 OHV rough idle @ 86,991 miles / 140,000k - Ranger-Forums - The Ultimate Ford Ranger Resource

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 11-27-2008
skateboard34's Avatar
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Join Date: Sep 2008
Location: fkj, nv
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1997 4.0 OHV rough idle @ 86,991 miles / 140,000k

its not for me its for my girl, on her truck... drives fine i guess (a bit weak), ....the rough idle forced the heat shield to come partly off when i bought it (thats how i got it so cheap for her)....so i took it off. i can hear the muffler struggle a bit and it does chug alot when still until take off...i have no clue where the air control valve is? if anyone could give me a list of things to start with i really appreciate it... thnx
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Old 11-27-2008
wydopnthrtl's Avatar
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If it's rough like you say.. I'd start with the ignition. An inopporable IAC or exahust won't cause a roughness. They would more likely be felt as a lack of power.

Since it's used w/87k miles.. just get some new plugs & wires for it. Install them, then start the real diagnosis if the problem still exists.

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Old 11-27-2008
rolsmojave3's Avatar
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Location: Wisconsin
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Most likley a leaky intake gasket, a well known problem on OHV 4.0l's.
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Old 11-27-2008
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Join Date: Nov 2007
Location: Port Coquitlam, BC
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Id start with the plugs dudes. I had the same thing on my old ranger around that time. Changed the plugs and it ran like new again.
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