Replace injectors or clean spool valves?
New User
Joined: Oct 2011
Posts: 24
Likes: 0
From: Kansas City, MO
My experience: Fought the stiction issue for 2 years until I fixed it.. Hot Shots helped for a long time along but the the problem continued (also run full synthetic oil.) I was able to determine which injectors were the problem by shutting off each injector via software (Auto Enginuity - I'm neutral on recommending it)
I thought why not try cleaning the spool valves. I took apart the 3 suspects ones, mechanically and ultrasonically cleaned the spool valves. Re-installed, ran better but not a magical fix. Cold EOT running rough problem was still present until 130 on EOT.
Changed the 3 injectors with OEM remanufactured - dramatic improvement. So much I went ahead and changed out the other 5. The truck runs, starts, beautifully now at any temp.
For me, I would go directly to re-mans and skip the cleaning step.
I thought why not try cleaning the spool valves. I took apart the 3 suspects ones, mechanically and ultrasonically cleaned the spool valves. Re-installed, ran better but not a magical fix. Cold EOT running rough problem was still present until 130 on EOT.
Changed the 3 injectors with OEM remanufactured - dramatic improvement. So much I went ahead and changed out the other 5. The truck runs, starts, beautifully now at any temp.
For me, I would go directly to re-mans and skip the cleaning step.
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Logistics Pro
Joined: Nov 2010
Posts: 3,673
Likes: 6
My experience: Fought the stiction issue for 2 years until I fixed it.. Hot Shots helped for a long time along but the the problem continued (also run full synthetic oil.) I was able to determine which injectors were the problem by shutting off each injector via software (Auto Enginuity - I'm neutral on recommending it)
I thought why not try cleaning the spool valves. I took apart the 3 suspects ones, mechanically and ultrasonically cleaned the spool valves. Re-installed, ran better but not a magical fix. Cold EOT running rough problem was still present until 130 on EOT.
Changed the 3 injectors with OEM remanufactured - dramatic improvement. So much I went ahead and changed out the other 5. The truck runs, starts, beautifully now at any temp.
For me, I would go directly to re-mans and skip the cleaning step.
I thought why not try cleaning the spool valves. I took apart the 3 suspects ones, mechanically and ultrasonically cleaned the spool valves. Re-installed, ran better but not a magical fix. Cold EOT running rough problem was still present until 130 on EOT.
Changed the 3 injectors with OEM remanufactured - dramatic improvement. So much I went ahead and changed out the other 5. The truck runs, starts, beautifully now at any temp.
For me, I would go directly to re-mans and skip the cleaning step.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
It's a fine file on the spool.
I am guessing at this point but I have a feeling that the spools
are honed into the housing to reach a given tolerance during
the assembly process.
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Logistics Pro
Joined: Nov 2010
Posts: 3,673
Likes: 6
Just wanted to give an update. I tore into the driver side tonight since it has the most crap to move out of the way looks like that side has 2 reman injectors in it.
The spool valves on the 2 (newer remans) moved easier by finger than the 2 other ones. After I cleaned them it definitely felt like I noticed an improvement, maybe my head is telling me that's what I want to feel? So I got them all re o ringed back up ready to go in. I hope I didn't leave the bolt to loose or to tight on the actual injector itself.
I really like working on this truck VS the 05+ so much easier to remove the HPO rail, that OTC disconnect tool I got worked like a charm.
I attached a couple pics
On the actual spool valve pic you can see the before on the left and after on the right. Nice and shiny and clean
The spool valves on the 2 (newer remans) moved easier by finger than the 2 other ones. After I cleaned them it definitely felt like I noticed an improvement, maybe my head is telling me that's what I want to feel? So I got them all re o ringed back up ready to go in. I hope I didn't leave the bolt to loose or to tight on the actual injector itself.
I really like working on this truck VS the 05+ so much easier to remove the HPO rail, that OTC disconnect tool I got worked like a charm.
I attached a couple pics
On the actual spool valve pic you can see the before on the left and after on the right. Nice and shiny and clean
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Logistics Pro
Joined: Nov 2010
Posts: 3,673
Likes: 6
It must of been a piece of lint of something....I looked this morning and it wasnt there...
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Logistics Pro
Joined: Nov 2010
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Well truck is all back together and everything was going GREAT
Until.....I lost high pressure oil and stalled out.
ICP building about 130PSI IPR is 84.* %
Hopefully the IPR is gummed up from crap falling into the heads while working on it.
Until.....I lost high pressure oil and stalled out.
ICP building about 130PSI IPR is 84.* %
Hopefully the IPR is gummed up from crap falling into the heads while working on it.
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Logistics Pro
Joined: Nov 2010
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Likes: 6
Well I got home pulled the IPR and it was perfect. Pulled the valve covers to check for a HPO leak somewhere nothing.
So I am thinking 2 things
My HPO fried bleeding the oil system.
Or could it be the ICP sensor itself?
So I am thinking 2 things
My HPO fried bleeding the oil system.
Or could it be the ICP sensor itself?
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