wont idle down!!!!!
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wont idle down!!!!!
90 bronco 302 fuel injection 5 speed starts great but wont idle down stays at about 1800 to 2000 rpms tried making shure the linkage was free and it is butterflys are closed sat for about a year dont know what my next step is ? thanks also have a few post on this channel please check them all maybe tied together same problem thanks
Last edited by chevygoneford; Nov 20, 2005 at 07:15 AM. Reason: added to it
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It can be a number of things. I would first check for vacuum leaks as they are the easiest to find. The IAC may not be working or may need cleaning. Do not clean this thing on the manifold- remove it to do it. Any solvent that gets into the manifold may damage the gasket between the upper and lower manifolds which is another area that may be the problem.
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removed the plenum
removing the intake and plenum think i spelled it right going to get new hose and gaskets tommorow what does is the IAC and what does it look like? have a real vacuum draw on the vent hose on the drivers side valve cover to the to the breather thanks for the help
Last edited by chevygoneford; Nov 20, 2005 at 06:27 PM. Reason: added to it
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The IAC is the Idle Air Control Valve. It is a cylinder shaped piece that is attached to the right of your throttle body and is held in by 2 screws. There is also a connector going into it. It has an actuator in it and the computer controls it and opens it so air can enter in your engine when your throttle body is closed (your off the gas peddle).
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I had that same issue with my 95. Check this post, i explained what i did there. turned out to be a bad TPS sensor. Changed it and all is fine now, well at least with that problem. Checking my codes pointed straight to the problem too.
https://www.ford-trucks.com/forums/s...d.php?t=425437
https://www.ford-trucks.com/forums/s...d.php?t=425437
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thanks still have a question
took off the plenum and the pipe to the egr is broke will that sound like a cracked exhoust manifold? couse thats what mine sounds like a cracked exhoust manifold got the vacuum hose today have to get the pipe tommorow and checkin the tps tonight thanks everyone ill let you know how it gos
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From: Gateway to the West
Originally Posted by chevygoneford
took off the plenum and the pipe to the egr is broke will that sound like a cracked exhoust manifold?
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well thats part of it
my intake gaskets were shot center of the intake the gaskets were drooping soaked with oil looks like someone in the past had the intake off becouse the lack of a front and rear gasket just a bunch of silicone slapped in there which would explain the huge amount of vacuum draw on the vent tube going to the breather from the valve cover . broke the left side rear bolt had to drill it and tap it putting it back together today i'll let you guys know how it goes
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