Re: 4.0 sohc vacuum leak/running rich
I believe that is your IAC Valve (Idle Air Control). Can't be sure. It have electical plug? The knock sound is likely a "ping" from a lean condition when running. While the engine is running and at operating temp(no A/C), unplug the IAC and see if idle drops down significantly or even stalls out.
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1995 Ranger XLT 3.0L OBDII
Trans: A4LD (E) 2WD
Rear: 7.5 / 3.45 NL LHD
Tires:GY P235 75/R15 (orig 225 70/R14)
Long Bed, 20 Gal Tank
Up to 229,900 miles
Last edited by Grumpa; 04-01-2017 at 07:59 PM.
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