"Stumble" at light throttle
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New User
Joined: Dec 2014
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From: Yakima, Wa
"Stumble" at light throttle
I just got a 95 F150 Eddie Bauer. 5.8L, Automatic. Nice truck.
I've encountered a few problems with it. Nothing too major so far. This one has me stumped.
At light throttle (i.e. taking off from a stop), there is a hesitation. It's seeming like the truck wants to stall out. I have noticed this happening before and after it warms up.
When I take off and give it a little extra throttle, it doesn't stumble.
I changed the fuel filter today (needed to be done), and it hasn't changed anything.
I have noticed an exhaust leak growing steadily worse by the day. It sounds like its coming from the passenger side manifold.
No CEL, and the truck starts right up every time.
Ideas?
My theories are as follows: Plugs and wires, EGR, transmission, catalytic converter.
I've encountered a few problems with it. Nothing too major so far. This one has me stumped.
At light throttle (i.e. taking off from a stop), there is a hesitation. It's seeming like the truck wants to stall out. I have noticed this happening before and after it warms up.
When I take off and give it a little extra throttle, it doesn't stumble.
I changed the fuel filter today (needed to be done), and it hasn't changed anything.
I have noticed an exhaust leak growing steadily worse by the day. It sounds like its coming from the passenger side manifold.
No CEL, and the truck starts right up every time.
Ideas?
My theories are as follows: Plugs and wires, EGR, transmission, catalytic converter.
Posting Guru
Joined: Sep 2011
Posts: 1,409
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From: Clitherall, MN.
I had to change the pass. man. on mine twice. The original one broke all the way through and the replacement was already cracked{ from JY}. Ended up getting some shorty headers from a friend. They work good.
Elder User
Joined: Feb 2014
Posts: 501
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From: Lincoln, NE
I put on JBA shorty headers. No problems!
I noticed that there is a slight stumble under very light acceleration right after I put in a clean K&N air filter. I didn't notice this with the stock air filter in place.
I noticed that there is a slight stumble under very light acceleration right after I put in a clean K&N air filter. I didn't notice this with the stock air filter in place.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
EVR: EGR Valve Regulator
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Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
If no vacuum with the electrical connector removed then you have the computer modulating the EVR when it is not supposed to..so bad computer or some moron has wired a continuous ground to the EVR (the computer does this when it is programmed to do it).
Be aware you will probably trigger a Check Engine Light and code by pulling the electrical connector. Not a big issue, just a heads up to not panic.
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