OK, I need help. My 93 F150 4X4 4.9L 5 speed will jerk while accelerating. Runs fine at idle even when reving. Replaced fuel filter. Only happens in low end of gear and high end, mid range runs OK. I'm at a loss. Don't know exactly what to check. O2 sensor is bad but has been running a while with check engine light on. Help?!
It started off random, now it's starts just about a mile down the road. I also was thinking fuel pump or the fuel pressure regulator.??? Love this truck it's been good to me but don't want to dump a lot of $$$ in it.
yeah I know what you mean I only had to dump around 200$ in mine between Rad and new shocks in the front I am about to get it lifted after BCT..... maybe its that emergency fuel shutoff? that ford has I have no idea where its located you can still download the manuals for these trucks. at Fords Fleet web page.
I was first thinking spark plug wires. Then you said it was after driving a mile. That means the problem is not happening when the truck is cold and not paying any attention to the sensors. Which leaves the sensors. You say that you know you have a bad O2 sensor. Did you do the test of the O2 sensor or did you just pull the codes? If it is just the code then run a functional test of the O2 sensor and if it is bad then replace it and clear the codes by disconnecting the battery for half an hour.
Doubt that it's the shut off or it wouldn't run at all. I'm way over what the truck is worth or as I like to say I've got a $5000, $1500 truck. As for IM I don't really like to give that info out on the net. Having said that I'm not that computer savy.
Update if anyone is interested. It was the distributor. Finally had to take it to a shop, took them a week to figure out, first they thought it was computer replaced it with a used one no difference. He finally guessed that it must be the distributor. Good news they could return the computer.
I hope that everyone can Post their good news or bad news relating to their problem!
Thank you for sharing!
1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
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Had to replace the whole distributor, wish I would of thought of that cause I could've done it myself for just the price of the distributor. But it didn't cost that much, just under $200. Now I have a bad headlight switch and no dash lights but with half the dash removed and it being way too cold out and don't feel like haulin' wood in I think I'll wait a bit to finish.
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