f-150 stumbles at part throttle
#1
f-150 stumbles at part throttle
95 F-150 4.9 5spd 2wd.
Truck starts and idles fine.
Sometimes during part throttle acceleration the truck stumbles, like it's running out of gas or losing spark. If you back off the throttle it will idle fine, if you give it more gas it will pull out of it.
Seems to happen more when it's cold.
Gas is good fuel filter is new.
Any ideas?
Truck starts and idles fine.
Sometimes during part throttle acceleration the truck stumbles, like it's running out of gas or losing spark. If you back off the throttle it will idle fine, if you give it more gas it will pull out of it.
Seems to happen more when it's cold.
Gas is good fuel filter is new.
Any ideas?
Last edited by mattri; 01-23-2010 at 06:23 PM. Reason: sp
#3
Mine has this problem and it falls on it's face a lot. Today it started to do the same thing but pulled thru the bog and BOLTED. Threw me back in my seat.
I don't know what it is.
Subscribed
#4
I would post this one and see what the electronic whiz's think.It could be something like a bad throttle position sensor.They will tell you to pull the codes and that is probably what you should do,then they can tell you what they are.Good luck with it,electronics are my weak point,guess I'm just too old.I was running HP points in my '68 GTO,you weren't even born yet.lol
#5
#6
ok ok....i was a late eighty's baby. i am so interested in this since i have no codes, tune up is new with new auto lite copper plugs, taylor wires, accell cap and rotor, msd coil, and all my maintenance is up to date.... like mattri was saying, it starts to stumble only at a certain point. if you give it gas, then it smoothes out. if you let off, it smoothes out. i do have my timing curved to 12 deg., but this stumble was present prior to that when it was at the factory 10 deg.
#7
Trending Topics
#10
I personally don't have a 6 cylinder. But I know that the 5.0 in these trucks were bad about crossfire between cylinders 7 and 8. I had this problem on mine. the cure was to make sure that those 2 spark plug wires were not run parallel to each other. I just crossed them at 90 degrees where i had to and zip tied them to keep them apart. It might be worth asking some good 6 cylinder guys about this.
#12
Interesting....
I'll have to look into mine. Starts perfect, runs perfect but when you wanna rev while in parked, it kinda misses, like it runs outta gas, let go the gas then floor it again, and revs right up fine.
I have no idea what rotor, plugs, and wires that's on it, I just bought the truck 1 week ago.
Still getting use to the whole EFI thing, I never had any EFI vehicles before.
I'll have to look into mine. Starts perfect, runs perfect but when you wanna rev while in parked, it kinda misses, like it runs outta gas, let go the gas then floor it again, and revs right up fine.
I have no idea what rotor, plugs, and wires that's on it, I just bought the truck 1 week ago.
Still getting use to the whole EFI thing, I never had any EFI vehicles before.
#14
#15
ok ok....i was a late eighty's baby. i am so interested in this since i have no codes, tune up is new with new auto lite copper plugs, taylor wires, accell cap and rotor, msd coil, and all my maintenance is up to date.... like mattri was saying, it starts to stumble only at a certain point. if you give it gas, then it smoothes out. if you let off, it smoothes out. i do have my timing curved to 12 deg., but this stumble was present prior to that when it was at the factory 10 deg.