Need help on this rough running problem
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Given the intermitant nature of the beast (1/2 the time or less?) and the long list of things you've checked or replaced, I would tend to think something is sticking.....like the IPR valve or an injector poppet valve. That's assuming it's not already fixed.
Might also be a low voltage problem. Batteries and alternator ok?
Might also be a low voltage problem. Batteries and alternator ok?
Thread Starter
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Junior User
Joined: Mar 2005
Posts: 97
Likes: 0
From: Florida
Update of findings on Running Rough Issue
Thanks cookie,
I always appreciate your comments...
I changed the IPR o-rings already(maybe I did not put this in the original list so hard to see in the posts).
An injector poppet valve is a possibility for sure..
Batteries are 5 mo. old each and alternator seems very strong but I have not actually tested. I will do that if today's fuel regulator valve action does not correct the problem.
Today, when installing the fuel regulator repair kit, I found 3 interesting things. 1) There were two 3/4" long slivers of rubber I suppose from the fuel line connection rubber seal and these were sticking on the spring and partially into the poppet cylinder. 2) I found a 1" long sliver of what appeared to be aluminum sticking thru the orifice of the poppet. It appeared to be stuck in position. 3) I also found the spring was bent about 1/3 down from the end towards the fuel line connector. I would think that this might interfere with the movement of the poppet assembly but not sure. It is still running good after 3 cold starts so far.
The real test is tomorrow morning when it is cold...
I always appreciate your comments...
I changed the IPR o-rings already(maybe I did not put this in the original list so hard to see in the posts).
An injector poppet valve is a possibility for sure..
Batteries are 5 mo. old each and alternator seems very strong but I have not actually tested. I will do that if today's fuel regulator valve action does not correct the problem.
Today, when installing the fuel regulator repair kit, I found 3 interesting things. 1) There were two 3/4" long slivers of rubber I suppose from the fuel line connection rubber seal and these were sticking on the spring and partially into the poppet cylinder. 2) I found a 1" long sliver of what appeared to be aluminum sticking thru the orifice of the poppet. It appeared to be stuck in position. 3) I also found the spring was bent about 1/3 down from the end towards the fuel line connector. I would think that this might interfere with the movement of the poppet assembly but not sure. It is still running good after 3 cold starts so far.
The real test is tomorrow morning when it is cold...
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Today, when installing the fuel regulator repair kit, I found 3 interesting things. 1) There were two 3/4" long slivers of rubber I suppose from the fuel line connection rubber seal and these were sticking on the spring and partially into the poppet cylinder. 2) I found a 1" long sliver of what appeared to be aluminum sticking thru the orifice of the poppet. It appeared to be stuck in position. 3) I also found the spring was bent about 1/3 down from the end towards the fuel line connector. I would think that this might interfere with the movement of the poppet assembly but not sure. It is still running good after 3 cold starts so far. The real test is tomorrow morning when it is
Thread Starter
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Junior User
Joined: Mar 2005
Posts: 97
Likes: 0
From: Florida
Problem finally resolved for good this time
The cause of my issue turned out to be the defective fuel regulator:
On 7/25 I installed the fuel regulator repair kit. I found 3 interesting things. 1) There were two 3/4" long slivers of rubber I suppose from the fuel line connection rubber seal and these were sticking on the spring and partially into the poppet cylinder. 2) I found a 1" long sliver of what appeared to be aluminum sticking thru the orifice of the poppet. It appeared to be stuck in position. 3) I also found the spring was bent about 1/3 down from the end towards the fuel line connector. I would think that this might interfere with the movement of the poppet assembly but not sure. It is still running good after 8 cold starts so far. and also two morning starts when it was definitely a cold start similar to conditions it had previously failed on.
thanks to several here on FTE for the helpful suggestions and especially to HeatStroked who nailed the cause.....
Now, I will check the fuel pump as cookie suggested to see if I can determine where the metal trash might have come from. I may need to put an additional fuel filter in-line also.
Thanks to all...
On 7/25 I installed the fuel regulator repair kit. I found 3 interesting things. 1) There were two 3/4" long slivers of rubber I suppose from the fuel line connection rubber seal and these were sticking on the spring and partially into the poppet cylinder. 2) I found a 1" long sliver of what appeared to be aluminum sticking thru the orifice of the poppet. It appeared to be stuck in position. 3) I also found the spring was bent about 1/3 down from the end towards the fuel line connector. I would think that this might interfere with the movement of the poppet assembly but not sure. It is still running good after 8 cold starts so far.
and also two morning starts when it was definitely a cold start similar to conditions it had previously failed on.thanks to several here on FTE for the helpful suggestions and especially to HeatStroked who nailed the cause.....
Now, I will check the fuel pump as cookie suggested to see if I can determine where the metal trash might have come from. I may need to put an additional fuel filter in-line also.
Thanks to all...
Last edited by Big Red 00 F350; Jul 27, 2005 at 11:53 AM.
