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1997 Ford F-150 4.2L Poor Idle Quality, Hesitation, Misfire
Posted to Ford Driveability on 10/6/2009 9 Replies

hesitating and backfiring off idle acceleration, came in with fuel trims LT +17% bank 1 and -15% bank 2 so I swaped injectors bank to bank with no change, I smoke tested intake and found intake runner shafts leaking vaccum at back end, then i installed another...

FIX posted 10/15/2009

9 Replies Received (View Replies)

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car Vehicle Data

1997 Ford F-150

Engine4.2 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Hesitation, Misfire
OccursUnder Load, on Accel
Misc.4.2 Pushrod V6