Ideling
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Fleet Mechanic
Joined: Aug 2002
Posts: 1,568
Likes: 33
From: Swansea SC
Ideling
When i first crank it up 1992 bronco 351 idles as usual high idle then off to 800rpms then will idle between 800-1000 (SURGES)0nly at first crank up , after running it a while it idles ok any suggestions? TR
Senior User
Joined: Mar 2004
Posts: 182
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From: Canada
I have the same problem with my 91 bronco 302, haven't nailed anything down yet, but I heard talk of it being the transmission. Anyways, my tranny is almost done being rebuilt so I will let you know if that changes things. Although I imagine its probably a sensor or something.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
2 possible things. TPS or the IAC . both are on the throttle body. the tps is located on the bottom an the iac is on the side. take them off and clean them along with the throttle body. you must use specific throttle body cleaner because of the coating inside . regular carb cleaner is not good to use. once these are clean, disconnect battery for 15mins . reconnect and drive for awhile so the ecu can relearn.
later
later
Elder User
Joined: Sep 2003
Posts: 533
Likes: 0
From: Myrtle Point, Or
Originally Posted by Kemicalburns
2 possible things. TPS or the IAC . both are on the throttle body. the tps is located on the bottom an the iac is on the side. take them off and clean them along with the throttle body. you must use specific throttle body cleaner because of the coating inside . regular carb cleaner is not good to use. once these are clean, disconnect battery for 15mins . reconnect and drive for awhile so the ecu can relearn.
later
later
What if U didn't use IAC cleaner?!?
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
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Fleet Mechanic
Joined: Aug 2002
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From: Swansea SC
I appreciate it kemical, I know idle problems seem to plague our rides-- i do remember the days of no computer and, gas was cheap---- who cared about gas mileage it was power 
100% will do as mentioned thanks TR
100% will do as mentioned thanks TR
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Elder User
Joined: Sep 2003
Posts: 533
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From: Myrtle Point, Or
It's in the throttle body, I know for 100% for that I've had it off about 10 times now. It only sticks when the motor is running, the vac puts pressure on the butterfly valves, and that is when is sticks. Anyone have a new one for cheap?-lol
