need help.bad running condition
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New User
Joined: Oct 2008
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need help.bad running condition
i just got a 91 f-150 six cylinder.it was running real bad.installed new plugs,wires.cap and rotor.it idels great.it has a bad hesition while driving.if i push the gas pedal down and power thru it it does not break up.it only happens when just driving and feathering the pedal....heres whats new on it..new fuel pump.fuel filter,plugs,wires,cap,rotor...when i got the truck the fuel pump would stay running when i turned the key so this truck would not run..messed with the plug relays and harness conections for the fuel pump and then it would start and has been fine...just need to get the bad hesition out of it...talked to alot of people and nobody knows what it is..need help.thanks guys..cj
Post Fiend
Joined: Jan 2005
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Have you tried to pull any error codes that may be stored? If not go to fordfuelinjection.com for instructions on how to. You might also want to check your fuel pressure and you might also check around the engine for any vacuum leaks and possibly take the EGR valve off and clean it. Good luck.
Elder User
Joined: Feb 2008
Posts: 797
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From: ohio
The egr could be opening prematurely,causing the hesitation.U could pull the vac line and plug it and see if better, or pull the egr and make a pop can gasket WITHOUT the two holes the gasses go thru and see if maybe its stuck open
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Are you saying you got no codes at all or you got the 11 or 111 all clear codes? If you got no codes at all you have a processor problem, if you got an all clear you could have a bad TFI module or weak ignition coil.. among other things.
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New User
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I don't know.I had a mechanic use the handheld scanner and he said its not showing any codes not even stored codes. But the check engine light came on when I had trouble with the fuel pump so it should show a stored code right??
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FTE Legend
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New User
Joined: Aug 2008
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From: Yorktown, Va
My 91 $.9 Auto has been doing the same thing. Usualy upto 1500 RPMs, where it likes to run. I have been through all my emisions and EFI censors.
I am leaning toward fuel injectors or torque converter, but don't know how to verify either.
let me know if a new EGR fixes yours.
I have replaced complete EGR
reamed out first cat
replaced all censors
checked fuel pressure
and vaccum
codes are all clear
I read somewhere that the torque converter was a common problem with these trucks and described similar symptoms.
I am leaning toward fuel injectors or torque converter, but don't know how to verify either.
let me know if a new EGR fixes yours.
I have replaced complete EGR
reamed out first cat
replaced all censors
checked fuel pressure
and vaccum
codes are all clear
I read somewhere that the torque converter was a common problem with these trucks and described similar symptoms.
New User
Joined: Aug 2008
Posts: 7
Likes: 0
From: Yorktown, Va
I believe that if the electrical switch is disconected the light will come on, so to run w/no light and no egr you could remove the switch from the egr housing and let it float. My EGR was 3 seperate pieces electrical switch, valve body, and EGR exhaust tube.