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89 high idle


Epixstar

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hi i have a 1989 ranger xlt 2.9 87,000 miles and i cant seem to get the idle to come down past 1400 rpms. I did i full tune up on it plugs wires and cap and rotor.i cleaned out the throttle body which was very dirty the best i can. I checked for vacuum leaks and could not find any up top. still the same idle at 1400. any suggestions of what i should do next.
 


Epixstar

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im looking for were the vacuum line gos were the gold screw is i pluged it. i have no clue were it go's i dont know if that could be the reason for the high idle
 
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Epixstar

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update unpluged the iac car shut off, then took it off and cleaned it real good no difference still idles around 1400 to 1600 r.p.ms any ideas?
 

piotrsko

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if the throttle set screw isn't allowing the throttle to fully shut you can get a fast idle, as also, bad coolant temp sensor, a bad intake temp sensor a bunch of intake leaks from the various hoses around the throttle body.

Could be other things, but the fact that the IAC shuts down the engine, I think the computer senses a need for high idle and is responding as such.
 

Epixstar

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i was about about a half gallon low on coolant the screw is all the way backed off for the throttle and i checked for vacuum leaks on the intake gasket with carb cleaner. im hoping it is just a bubble in the cooling system i know it leaks from the water pump just a little. im gonna plate it and drive it a little bit tomorrow to see if that helps. Ill do the water pump when it warms up a little here still well bellow freezing in the motor city.
 

RustedRanger

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The screw for the throttle is not for adjusting the idle....it sets the TPS. If you changed it then it will have to be reset. On mine I unplugged the IAC and it would die, I cleaned it a couple times but it was still bad. I do agree it could be the CTS,the computer might think the motor is cold and keeps the idle high. On mine I finally had it put on a diagnostic computer and found several problems, it is not cheap but it saved me time and money replacing more parts that didn't need replacing.
 

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i know it was like that win i bought it. i will have to learn how to set it
 

Sicktight722

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im looking for were the vacuum line gos were the gold screw is i pluged it. i have no clue were it go's i dont know if that could be the reason for the high idle
On mine. the hose that goes where that screw is goes to a T over need the fan box. Mine was unplugged for a while and I plugged it back and it doesn't run any differently. I also have a high idle. but I think mine might be from the spark plugs being out of specs on the gap.
 

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