Having problems with your 1994 Ford F150 Styleside Supercab ?

94 F150Engine Revs up and down at start up and when put into gear

\015 Engine will crank fine then start to rev up and down until put into drive or reverse. Almost dies when put into drive or reverse...have to wait before pressing the gas, also seems to have even more trouble if the ac or heater is running whn shifting. Doesn't seem to have any problems after you drive it awhile. Seems when you first turn the key into the acc. position it has a popping sound that comes threw the speakers.\015\012\015\012Its is a 1994 F150 with a 5.0 Auto\015 Posted / edited by AnonymousUser on : 14-05-2018

Answers :

Sounds like a deep seated electical fault, i would recomend you take it for a computer diagnostic

kind regards
Hi and welcome to FixYa,

Your post is descriptive:
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  • Engine will crank fine then start to rev up and down until put into drive or reverse - idle hunting;
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  • Almost dies when put into drive or reverse - idle too low;
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  • have to wait before pressing the gas - idle hunting;
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  • also seems to have even more trouble if the ac or heater is running whn shifting - additional load to an already troubled engine;
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  • Doesn't seem to have any problems after you drive it awhile - engine has sufficiently warmed up;
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  • Seems when you first turn the key into the acc. position it has a popping sound that comes threw the speakers - most likely relays engaging causing spikes.
Based on the above, recommended course of action would be:
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  • have the computer scanned for error codes/logs;
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  • temporary workaround may involve cleaning the intake side with special attention to the throttle position sensor and the MAF sensor;
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  • of course all other checks would be to your advantage including electrical contacts, other sensors;
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  • ultimately a tune-up with sensor check/cleaning/replacement might be your best bet.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
Repair Help & Product Troubleshooting for 1994 Ford F150 Styleside Supercab

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