Question about Ford Cars & Trucks
Ive replaced the iac valve, o2 sensor. it got worse after i cleaned the throttle body. i can slow the idle if i put my hand over the throttle body an block the air going into it. so for some reason its sucking way to much air. i have to use starter fluid to start it now.
It is symptomatic of a throttle position sensor. After removing the throttle body, the two screws that secure the tps can be very tight. Use the correct size driver to get a tight fit when removing the screws. You may need to use a penetrating lubricant if you judge that the screw is frozen and the head may strip. You may be able to apply some heat to the screw also, be careful.
When the throttle body is off, slowly move the accelerator linkage to see that the throttle body plates are; opening and closing without hanging up, are moving freely without feeling sticky and the accelerator linkage shaft that goes through the throttle body and keeps the throttle plate(s) aligned and secure has no free-play and there is nothing else on or around the sensor that could affect its operation.
Clean all associated parts as per manufacturer's recommendations. Remember to mark or record where all parts were removed from for easy reassembly.
Posted on Nov 24, 2014
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Posted on Jan 02, 2017
Check the Idle accelerator valve located on front side of throttle body, it is either stuck or needs cleaning real bad, this is what controls your idle speed, by letting small amount of air in. It has a plunger on it that moves back and forth slowly to adjust amount of air mixture, it is controlled by computer. Unplug it and just turn on key and check for voltage.This valve gets real gummed up, probably need to take apart throttle body and clean. HUNT
Posted on Jun 07, 2010
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