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11-01-2012, 10:59 AM
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#1 |
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Registered User
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bronco high idle and truns off when lowered
hi guys i have a 1991 bronco when i bought it it would turn off the second u put in drive or reverse,so i put new plugs,wires,oil,fuel filter ,air filter,ignition coil,idle control valve,and new distributor now the truck drives and has no problem going into gear but the rpm's are at 1500 on idle but when we lower the idle she dies in gear like right away i am at whits end i just bought a scanner and am gonna try when it get to house but i also thought i could have a vac leak but i cant seem to find any
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11-01-2012, 11:04 AM
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#2 |
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Registered User
Join Date: Aug 2003
Location: Albany, Oregon
Posts: 998
iTrader: (0) Bronco Info: 1992 XLT 5.8, 3 inch body lift and 33 inch BFG
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Come back with the codes then will talk
__________________
1992 Bronco XLT, 351w. Mostly stock for now. http://www.superford.org/registry/ve...il.php?id=3717 |
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11-01-2012, 01:03 PM
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#4 |
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Fullsize Member
 
Join Date: Apr 2005
Location: Rolling Hills Estates, CA
Posts: 7,595
iTrader: (1) Bronco Info: 1986 Bronco XLT 4x4 -AOD -Warn Hubs, NEW stock 302EFI, MSD cap, rotor, 48kv coil, 9mm FMSR wires
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Definately pull codes and see what elec/electronic faults are indicated but usually cleaning the IAC = idle air control valve does the trick, check test the TPS = throttle position sensor for voltage range, either may pop up as a fauilt code.
Just press the gas pedal down when the idle is high and kick the rpms down until you figure it out.....with sensors a lot depends on how old they are so if you don't know or haven't replaced in some time them now is a good time to do so.... The rule of thumb with the IAC is, if you unplug it and the engine stalls it's one full turn of the throttle body "idle stop screw" inward/right located on the right side of the throttle body, it's spring loaded and I would count the number of screw threads protuding on either side of the TB block if you need to put it back the way it was.... Good Luck ~
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11-21-2012, 10:06 AM
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#7 | |
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AKA: Butthead
Join Date: Apr 2009
Location: Gadsden Purchase
Posts: 2,856
iTrader: (0) Bronco Info: '91 RoadQueen 351w-2wd-ZF camtiming+4* 265/75-16E's dual Ranchos F&R, SuperCab bench seat EEC=F250
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Quote:
Been thinking about how to go about getting a "TPS report" and just now came up with this idea... Strip the three wires (or just two) like a 1/2" and then twist the wire to form a "teat" then solder the little teats. The trick is to stagger 'em so they won't-never touch each other. I made three little jumpers but it's just another step installing those that just seems unneeded? Test yours using an analog voltmeter and/or an ohmmeter, look for smooth voltage or resistance operation. It's a potentiometer... is there such a thing as a 100% all-the-time -smooth- operating potentiometer? LOL :) Alvin in AZ ps- Just checked out Rockauto.com and a Standard Motor Products TPS is more money than a Motorcraft. ~$50 ...look under "Fuel/Air" |
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11-21-2012, 03:34 PM
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#8 |
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Fullsize Member
Join Date: May 2007
Location: Seattle, WA
Posts: 3,251
iTrader: (4) Bronco Info: 1990 EB FSB, MAF, 6.7L, E4OD, 4" Rancho, 4.56, 33" on 15x10 Alcoa's
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Junkyard made TPS Test Harness...
 My concern is how the OP is lowering his idle which caused the engine to die in gear. I hope he wasn't turning the factory set throttle stop screw... See these links: Throttle Position Sensor Testing, Replacement and Adjustment How to Test and Clean your IAC
__________________
1990 Bronco, MAF, 408 Stroker, Level 10 E4OD, Currie F9+, Electric Boost Brakes, lots more... 
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