1992 Ford Bronco Base Idle Set Screw Procedures

CFBRONCO19

MEMBER
1992 FORD BRONCO
V8
4WD
AUTOMATIC
203,000 MILES

I have a problem on my Ford Bronco that when i have it in drive and i step on the throttle and release quickly the RPMs dip down to abt 500 to 450RPMs then comes back up to about 750RPMs. my problem is the truck wants to stall for example, when im in traffic and i step on the throttle and let go quickly it would want to stall for a moment then come back up on the RPMs. i checked everything on the motor, IAC Motor, vacuum pressure, fuel pressure, i scanned the computer and no codes came up, i physically inspected the motor and everything is fine. now there is an idle set screw on the throttle body and i wanted to know if theres a bulletin on where to set that screw so the venturis (Throttle body Flaps) can be properly adjusted. all i know is when one is going to set the idle, they have to disconnect the IAC motor (Idle Air Control) to set a true idle and then connect the IAC back. the problem somewhat got remedied after i did that but its not up to standards, it still does the stalling but not as bad. if theres any information on the procedures to adjust the idle set screw on the throttle body I'd greatly appreciate it.
Thank you,

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Try checking the throttle position sensor could be out of range/weak spot

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Thursday, February 21st, 2008 AT 3:38 PM

CFBRONCO19

MEMBER
15 POSTS

The TPS Is Fine. I have 0.95 volts when flaps closed and 4.20 volts when wide open throttle, also I slowly increase the throttle and the value on the tps smoothly increases. There isn't any gaps or anything the tps is new. The truck is running alot better now that I adjusted that screw but its not perfect. I might send the truck to get re-mapped because its running a little rich due to the extraction of the catalytic converter. That might be causing that off set idle condition the computer is probably dumping more fuel than necessary. Ill keep you posted on this and/or anything new. I appreciate your help and support thanks.