Help with rough running
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New User
Joined: Nov 2008
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Hey all:
99 250 with a v-10 auto 190K. The truck is great but always had a tendency to eat coils and exhaust studs. Now, primarily just on the highway in Od (and just cruising, light on the throttle) the truck stumbles, like a bad coil. If I floor it, it goes away, so it's just at cruising speeds. I checked codes for a bad coil but it does not show any. changed the fuel filter and no luck.
My thoughts are that maybe there is a tranny sensor that may be going bad??
I don't think it's a bad coil as it is just happening at very light throttle and primarily in OD at highway speeds
Any thoughts?
Thanks
Andy
99 250 with a v-10 auto 190K. The truck is great but always had a tendency to eat coils and exhaust studs. Now, primarily just on the highway in Od (and just cruising, light on the throttle) the truck stumbles, like a bad coil. If I floor it, it goes away, so it's just at cruising speeds. I checked codes for a bad coil but it does not show any. changed the fuel filter and no luck.
My thoughts are that maybe there is a tranny sensor that may be going bad??
I don't think it's a bad coil as it is just happening at very light throttle and primarily in OD at highway speeds
Any thoughts?
Thanks
Andy
Senior User
Joined: Jan 2006
Posts: 283
Likes: 1
Does this engine have an EGR valve? Does the stumble occur as you depress the throttle or while cruising under light load?
A stumble or miss can "go away" when the rpms are kicked up a bit, yet still be present. You're just turning more rpms, so it could be easier to be less detectable.
Hard to say what your problem is, I'm no expert on the new V10s, let alone the older ones. Could easily be a bad plug wire, bad plug, MAP sensor or MAF. Not sure if the older V10s used COPs. And I wouldn't know if this engine came with what emissions equipment from that time frame. Could also be a vacuum leak.
Someone should be along who can better assist you.
Enjoy,
RustyFuryIII
A stumble or miss can "go away" when the rpms are kicked up a bit, yet still be present. You're just turning more rpms, so it could be easier to be less detectable.
Hard to say what your problem is, I'm no expert on the new V10s, let alone the older ones. Could easily be a bad plug wire, bad plug, MAP sensor or MAF. Not sure if the older V10s used COPs. And I wouldn't know if this engine came with what emissions equipment from that time frame. Could also be a vacuum leak.
Someone should be along who can better assist you.
Enjoy,
RustyFuryIII
Elder User
Joined: Jan 2007
Posts: 605
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Ok. Inspect the 90 degree rubber hose that comes out of the throttle body. It could be a hole in the rubber hose.
Thread Starter
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New User
Joined: Nov 2008
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Hey Mike:
yea, it was a bad coil, but as always I get one fixed and another one goes bad..... sucks
On my 99, the counter does not show any bad ones, so it's kinda hit or miss. I was lucky that the bad one actually was ripped at the hole where it bolts to the manifold and that was the first one replaced.
i've got another one bad now and will get to it tomorrow as snow is coming
What year is yours?
Andy
yea, it was a bad coil, but as always I get one fixed and another one goes bad..... sucks
On my 99, the counter does not show any bad ones, so it's kinda hit or miss. I was lucky that the bad one actually was ripped at the hole where it bolts to the manifold and that was the first one replaced.
i've got another one bad now and will get to it tomorrow as snow is coming
What year is yours?
Andy
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Joined: Feb 2008
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I have a 99 and a 02. it was the 99 that is running rough and the 02 I have to replace broken studs on drivers side.
both almost the same exact truck. but one has AC.....
both almost the same exact truck. but one has AC.....
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