ford bronco idle (5.0)

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Old 03-31-03, 08:48 PM
hoopmd
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ford bronco idle (5.0)

AFTER A DEALER PERFORMED A TUNE UP A FEW MONTHS AGO ON MY 88 BRONCO (5.0L), THE IDLE STARTS "BOUNCING" BETWEEN 500-1000 RPM UNTIL IT FINALLY "BOUNCES" LOW ENOUGH TO STALL. I'M NOT GOING BACK TO THE SAME PLACE FOR ANOTHER FEW HUNDRED DOLLARS WORTH OF NOTHING, WHERE DO I START (SINCE WE KNOW IT'S NOT PLUGS,WIRES, ETC..). A LIST OF MOST LIKELY TO LESS LIKELY WOULD BE GREATLY APPRECIATED.
 
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Old 03-31-03, 09:06 PM
WeldGod's Avatar
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Its hard to tell, having your codes read would be a good place to start. Also check to make sure your vacuum lines are all intact and not leaking. Next check all of your sensor wiring (IAC, CMP, B-MAP, CP, MAF etc.) Is it carbureted or injected? If its Injected you have a TFI setup, if not itís a Duraspark.
 
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Old 04-01-03, 03:21 AM
Joe_F
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1988 Broncos are MFI injected 5.0 engines.

Original poster: Kill the caps, no need to shout.

Check your throttle body for dirt, IAC for proper operation, and make sure you don't have a vacuum leak.
 
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