Sporadic Problem... Guidance??
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Joined: Nov 2006
Posts: 11,286
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From: North of Greenville
Sporadic Problem... Guidance??
Quickly and briefly...
When running down the road, while getting up to highway speed, the engine starts running really rough and I lose all acceleration power. Sometimes the problem will go away after several miles of running, once it went away immediately after hitting a rough road patch that caused a rough bump to the vehicle. Only been happening since Wednesday night.
Oil is full and not old.
Plans for this afternoon and tomorrow morning (in order), which include running AE while driving around to see what I can discover there...
1- replace ICP sensor (I noticed oil in it a while back and have just been waiting to install the spare)
2- replace both fuel filters (it's about time to do that anyway)
3- check the status/condition of the tin nut on the back of the IPR
4- take the truck out and run it and see if the issue is gone... if not, proceed to step 5, and that is where the question comes in...
5- either pull the VC's and check the harness connections OR replace the IPR with my spare unit OR both.
Thoughts... insights?
Thanks ahead of time.
When running down the road, while getting up to highway speed, the engine starts running really rough and I lose all acceleration power. Sometimes the problem will go away after several miles of running, once it went away immediately after hitting a rough road patch that caused a rough bump to the vehicle. Only been happening since Wednesday night.
Oil is full and not old.
Plans for this afternoon and tomorrow morning (in order), which include running AE while driving around to see what I can discover there...
1- replace ICP sensor (I noticed oil in it a while back and have just been waiting to install the spare)
2- replace both fuel filters (it's about time to do that anyway)
3- check the status/condition of the tin nut on the back of the IPR
4- take the truck out and run it and see if the issue is gone... if not, proceed to step 5, and that is where the question comes in...
5- either pull the VC's and check the harness connections OR replace the IPR with my spare unit OR both.
Thoughts... insights?
Thanks ahead of time.
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Joined: Nov 2006
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From: North of Greenville
I can see potential for the IPR valve to be getting a little sticky, but don't really think that's the issue because I never have problems at startup. That's why I was thinking perhaps the tin nut may be loose and letting the coil move around, or perhaps the beginning of a loose connection in the UVHC. However, I don't really see how the valve cover gasket itself could be an issue.
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Joined: Nov 2006
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From: North of Greenville
I'm personally leaning more towards that end as well, but like I mentioned above, I'm going to perform due diligence on the other issues just to be thorough. I've already checked at the house, and I DO have two quarters and a grinder ready for use!
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Post Fiend
Joined: Mar 2007
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From: Texas
A loose UVCH will usually throw a CEL Pete. I don't see any mention of that in your post. Do any of the dash lights flash when it acts up? If you think hitting a bump did straighten things out, don't forget the wiggle test. Just grab a hold of any wiring harness you see and wiggle at idle and see if you can make the engine stumble.
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Cargo Master
Joined: Jan 2009
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From: OKC, OK
No need for a grinder...tin snips work fine.
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Joined: Jan 2011
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From: Puget Sound
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Joined: Nov 2006
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From: North of Greenville
I'm getting ready to dig into everything right now. The truck almost left me stranded yesterday on the way to the house. Pulling over and restarting several times saw the engine smooth out enough to let me limp home. Funny thing is that the truck seems to run OK at <35 mph, but if I goose it and try to go faster... that's when the struggle begins. I'm going to go ahead and replace the fuel filters first and see how that does, and I'm also going to go ahead and just replace the ICP sensor which is leaking oil much more now than last summer.
The only time I've noticed the engine light is when I ran home yesterday afternoon with the ICP unplugged.
The only time I've noticed the engine light is when I ran home yesterday afternoon with the ICP unplugged.
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Joined: Nov 2006
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From: North of Greenville
FIXED... but we were ALL wrong!!
When I started the truck this morning to move it over to the garage to begin working on it, I noticed the absence of a peculiar sound. As I investigated further, I discovered that the Carter fuel pump (located between the pre-pump filter and my stock fuel pump)... was NOT running at all and the stocker was cavitating like crazy!
DVM showed good voltage to the pump, so I swapped it out with a spare and everything is LOVELY!! I also went ahead and changed the pre-pump fuel filter since it was close to time to do so, and I also went ahead and replaced the leaking ICP sensor.
The Carter pump I removed had about 80-90K miles on it, so it lived a decent life.
I'll just do the 50 cent mod whenever I get around to replacing the GP's and checking all my bolt torques under the covers.
Thanks for the inputs.
DVM showed good voltage to the pump, so I swapped it out with a spare and everything is LOVELY!! I also went ahead and changed the pre-pump fuel filter since it was close to time to do so, and I also went ahead and replaced the leaking ICP sensor.
The Carter pump I removed had about 80-90K miles on it, so it lived a decent life.
I'll just do the 50 cent mod whenever I get around to replacing the GP's and checking all my bolt torques under the covers.
Thanks for the inputs.
still plays with trucks
Joined: Mar 2004
Posts: 1,743
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From: Twin Falls Idaho
sorry I'm late to the party. My first thought was put a fuel guage on it! I fought a similar problem halfway across the US a couple of years ago and it turned out to be low fuel pressure. Glad you got it fixed
Barney
Barney
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From: Puget Sound