1994 Ford F-150 Jerking

MS3

MEMBER
1994 FORD F-150
V8
4WD
AUTOMATIC
78,483 MILES

Just purchased a very nice 1994 F150 XLT 4x4 (or so I thought). On the way home driving quite a few miles on the Interstate, driving at about 65-70 mph, as I eased on the accelerator because of traffic, the truck suddenly jerked/lunged - this was a strong jerk/lunging.(As a hesitation). Is the tranny going out? What would it cost to get it repaired? Is it necessary to replace the whole Tranny?
Thanks for your answer.
MS3

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

It sounds like a misfire. Did the check engine light come on? Also, you may want to check the fuel pump or filter. The pump may be weak or the filter may be plugged causing the engine to miss because it doesn't get enough fuel. It doesn't sound like the transmission.

Let me know what you find or if you need directions, let me know.

Joe

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Wednesday, July 7th, 2010 AT 10:15 PM

MS3

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1 POST

Joe,
Thanks for taking the time to reply. I do not believe it was the engine misfiring. It runs very smooth consistently. The engine runs great. The jerking manifested itself for example, when going down the highway (between 65 and 70 mph) under drive, all of a sudden it behaved as if it was in neutral and then bang, (loud noise and shove/jerk) it would be in gear again but it felt as if some vehicle hit you from behind.
Is there a transmission fluid flow regulator? Or switch that could cause this? I don't think it is the discs slipping. By the way, this did happened around 70 mph.

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Wednesday, July 7th, 2010 AT 11:09 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

It does sound transmission related if the engine reved while the trans was in gear. There are pressure regulators in the valve body of the transmission. However, they usually don't cause this type of problem. In all honesty, (and I could be wrong) this sounds like an electrical problem. Has the check engine light ever come on? Also, if you have an OD light, has it ever flashed?

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Thursday, July 8th, 2010 AT 12:19 AM