Question about 1991 Ford Explorer
Try running Chevron Techron concentrated fuel injector cleaner in a 1/4 tank of gas.
Also, may be the issue in this TSB.
LIGHT TRUCK: 1990-91 RANGER
ISSUE: A hard start or no start condition may occur when the engine is cold. The engine may not start without cycling the key to the OFF position and back to START. Ignition switch bounce (loss of electrical continuity between contacts) may cause the EDIS module to recycle several times or to lock-up and not allow a start at all.
ACTION: Install a new ignition switch containing synthetic lubricant which reduces the amount of bounce. Also, install a new wiring connector containing a new material that is compatible with the new synthetic lubricant. Refer to the following procedure for service details.
PART NUMBER PART NAME F2TZ-11572-A Ignition Switch F2TZ-14489-A Wiring Connector
Posted on Nov 12, 2009
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Posted on Jan 02, 2017
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