1995 F150 V8 shakes and loses speed at certain speeds
11-13-2009, 09:40 AM
#11
Senior Member
if its not the fuel filter id replace the plugs, wires, cap, and rotor button if its been a while. a bad wire will get worse under load, so if you're high rpms at 55 and low rpm in a higher gear at 65 that would make sense.
11-15-2009, 04:58 PM
#12
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sounds like a fuel filter and does it make make more smoke or no cause one of your injectors could be bad that is if its efi im a suming the 302 or 351 correct i had a weird day with my truck once still cant explain it at night i was driving home turned it off restarted and it was putting like crazy my shifter was shaking so violently it was poping out of gear and then i noticed it was smokeing so bad out the exahust i leave it at my freinds house next morn was ready to do some checks but for laughs i said lets start it up so i did and it ran perfect now my guess is the fuel injector stuck oppen or the intake plentum had a leak and inhaled a gulf of oil cause repairing my truck today when rebuilding the engine there was huge mounts of oil in the plentum so it had a vacuume leak there but your guess is as good as mine now when you say these certian speeds does it do it all the time and by chance are all these speeds the same rpms . .. on the engine . . real quick what does the engine idle at if you have a tac
11-16-2009, 02:39 AM
#13
so no rough idle hmmm try checking the fuel rail pressure see if its within specs with the engine running and it prob wont make a difrence but lift the rear up and throw it in gear and see when it hits 55 if it does the same thing prob wont cause no load but eh all i could think of is lack of fuel or air
12-09-2009, 02:17 AM
#16
yes i have lol but i worked in a dealer ship and we test like that except we have a sizor lift not jacks but if you lift it and jack it corectly it should be fine chuck the front wheel of corse and dont put it in 4x4 lol
12-09-2009, 09:14 AM
#17
Senior Member
I wish I had a lift, life would be soo much easier. But regardless of how new the fuel filter looks, replace it. They cost less than 10 bucks and just because its new doesnt mean you didnt suck a bunch of garbage from the bottom of the tank into it. Check it for engine codes, it could be a speed sensor or something electronically controlled like that. Thats definitely where I would start.