1991 Ford F-150 Custom 5.0L Poor Idle Quality, Misfire - iATN

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1991 Ford F-150 Custom 5.0L Poor Idle Quality, Misfire

Posted to Ford Driveability on 9/23/2002 9 Replies

Hey techs,

This truck has been a problem child for us now for a good while. It came to us with a soft miss when engine warms up. We have checked or replaced everything but the radiator cap. Cylinders #1 and 5 both miss when engine is warm, its like someone th...

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Related Documents & Media 1991 Ford F-150 Custom

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Vehicle Data

1991 Ford F-150 Custom

VIN	1FTEX15N1M
Engine	5.0 L / 8 cyl / GAS
Trans	4-speed Automatic
Delivery	FI / MFI
Symptoms	Poor Idle Quality, Misfire
Occurs	Only in Closed Loop

Message Closed w/FIX

Vehicle Data

1991 Ford F-150 Custom

VIN	1FTEX15N1M
Engine	5.0 L / 8 cyl / GAS
Trans	4-speed Automatic
Delivery	FI / MFI
Symptoms	Poor Idle Quality, Misfire
Occurs	Only in Closed Loop