Question about 1989 Ford F 150

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1988 ford bronco 302 idles irratically and stalls when it is put into park. Changed the throttle by-pass valve and it has not improved. Any other ideas?

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  • Mark Barclay May 23, 2014

    remove the i.a.c motor, idle air controll that is, take a cam of air intake cleaner and remove all black gunk from the punger and spring of the i.a.c, then do the same with were it came from being the t.b.i uint. then remove the battery cable to reset for at least 5 mins, reconect battery turn ign key on but not to start motor do that 3 times then start the truck and idle for 5 mins till up on opp temp. then you will need to drive the truck at 60km per hour steady at that speed for a block or 2 the longer the better, then shut truck off and the start and idle should be running perfect. please note the ford is bad for i.a.c motors it my need a new one if that did not dot the trick 80 pect of the time it will fix the prob ... good luck buddy

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Decarbin the trotle body, and i.a.c motor then clear all codes, and relearn the the idle..

Posted on Nov 04, 2010

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