Engine stumbling
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Junior User
Joined: Jan 2006
Posts: 59
Likes: 1
From: North Royalton, Ohio
Engine stumbling
This is my final attempt before takeing my truck to a mechanic. I am have a engine stumbling or stuttering problem. All starts are normal, then it runs for a minute or less and it starts to stumble then either recovers and engine rpm goes up and down and returns to stumble or dies. I have notice while driving it. It likes to studder on take off and between 1500-2000 rpms. If give it more gas, eventually it does catch up. Any Ideas?
I have a 95' F-150 5.8L 351 EFI type H
I have already replaced the air filter, cleaned throttle body, new cap, rotor, wires and plugs. New fuel Filter, Checked fuel pressure, 40 psi in start, 34 psi when running. Checked and replaced vaccum lines. replaced pcv valve.
Just read the post about How to self check the computer, And I will do that this afternoon, I took to a auto parts store and they didn't read anything from the computer reader. But it sounds to me, that a self test would be better.
I have a 95' F-150 5.8L 351 EFI type H
I have already replaced the air filter, cleaned throttle body, new cap, rotor, wires and plugs. New fuel Filter, Checked fuel pressure, 40 psi in start, 34 psi when running. Checked and replaced vaccum lines. replaced pcv valve.
Just read the post about How to self check the computer, And I will do that this afternoon, I took to a auto parts store and they didn't read anything from the computer reader. But it sounds to me, that a self test would be better.
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Thread Starter
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Junior User
Joined: Jan 2006
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From: North Royalton, Ohio
ok, finally. I refered to the infamous chiltons manual and found out how to test the TPS and IAC. Did the check, and they are good. Some where in this forum, I read about someone disconnect the o2 sensor and I tried that. The truck ran real good.(did not try road test) Reconnected o2, and the it ran normal, started stayed running for about 1 min. then started to stumble and die. repeated these 2 cycles and had the same results. I am gonna get an o2 sensor tonight. Unless someone tells me not to. It would seem to me that this is the cause. Right?
Also, low and behold I found out that, my check engine light must be burnt out, because it didn't come when I ran this test, and I notice NOW. That it doesn't even comeon when starting the truck.
Also, low and behold I found out that, my check engine light must be burnt out, because it didn't come when I ran this test, and I notice NOW. That it doesn't even comeon when starting the truck.
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Joined: Jan 2006
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funny my cel dosent come on at start up either ...has to be the hardest light i ever tried to change the bulb in too any easy way to change ????94 f250
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Originally Posted by RJPstruck
ok, finally. I refered to the infamous chiltons manual and found out how to test the TPS and IAC. Did the check, and they are good. Some where in this forum, I read about someone disconnect the o2 sensor and I tried that. The truck ran real good.(did not try road test) Reconnected o2, and the it ran normal, started stayed running for about 1 min. then started to stumble and die. repeated these 2 cycles and had the same results. I am gonna get an o2 sensor tonight. Unless someone tells me not to. It would seem to me that this is the cause. Right?
Also, low and behold I found out that, my check engine light must be burnt out, because it didn't come when I ran this test, and I notice NOW. That it doesn't even comeon when starting the truck.
Also, low and behold I found out that, my check engine light must be burnt out, because it didn't come when I ran this test, and I notice NOW. That it doesn't even comeon when starting the truck.
Mike
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Thread Starter
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Junior User
Joined: Jan 2006
Posts: 59
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From: North Royalton, Ohio
Yeah, I did replace the O2 sensor. Oh my, It is like night and day. My truck is back from the nursing home. No stumbleing, engine revs. Smooth clean idle and a whole lot over horses not being held back.
Thanks
Thanks
