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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 01-23-2010, 06:22 PM
mattri mattri is offline
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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?

Last edited by mattri; 01-23-2010 at 06:23 PM. Reason: sp
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Old 01-23-2010, 06:26 PM
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interested in this one....my 95 with the 4.9 does the same thing.....
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1995 F150 Flareside w/ six cylinders of fury, SAS'd, Locked, and sittin on 35's for now
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Old 01-23-2010, 07:06 PM
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interested in this one....my 95 with the 4.9 does the same thing.....
Mine too. Dad called it a "miss". I thought when a truck misses it's random.

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.

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Old 01-23-2010, 07:23 PM
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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
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Old 01-23-2010, 07:31 PM
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important

what kind spark plugs's wires, dist cap, rotor and coil?

Are they motorcraft? I try auto zone it was huge mistake.

Have issues it would stumble sudden REV then bang in 3 gears so hard that I was afraid I blew up transmission. That was 95 F250 with 351W
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Old 01-23-2010, 07:31 PM
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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.
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The only way this Bronco could get any better is if Jessica Alba and Lindsey Lohan made love and waxed this Bronco with their combined love juices.
1995 F150 Flareside w/ six cylinders of fury, SAS'd, Locked, and sittin on 35's for now
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Old 01-23-2010, 07:50 PM
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There could be problem that you didn't use motorcraft for that. They are really strict what parts we use. Aftermarket parts for ignition system won't work it would short out and cause tons trouble.
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Old 01-23-2010, 08:14 PM
mattri mattri is offline
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Autolite plugs cap and rotor. Replaced them all about 6 mo ago. Truck just started doing this about a week ago.
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Old 01-23-2010, 09:09 PM
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still no answers, mine is doing the same thing. it doesnt matter what gear i am in but it will do it ussually at 1/4 throttle
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Old 01-24-2010, 02:22 AM
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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.
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Old 01-24-2010, 03:27 AM
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well i pulled off the vacuum hose that goes to the egr and that solved my problem, now i will be making me a plate like what some other guys have talked about.
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Old 01-24-2010, 01:51 PM
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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.
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1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 01-24-2010, 02:01 PM
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That's about what mine does. Runs good otherwise, it's strange.
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Old 01-24-2010, 02:02 PM
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mine kinda does the same thing...when the trucks cold and I rev it I can see the RPM gauge dip down and sometimes stalls. When I changed the O2 sensor and I started it without it in it would rev up fine...cold or hot. and I could never figure it out
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Old 01-24-2010, 09:47 PM
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Quote:
Originally Posted by fishforlife2007 View Post
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.
what are you gettin with 2 degrees of difference in timing?
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Old 01-24-2010, 09:47 PM
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