I've been fighting a little monster..... Last year I took the truck in for the CPS recall. The truck had been running great with no issues but I figured "hey free CPS!" From that point on the truck has been one very odd & lengthy issue.

So about 10 days after the new CPS "grey" was installed the truck hit a rough patch in the road and the truck started up with a bucking from the engine and throwing CEL. Felt like a serious misfire was occurring. RPS would fluctuate wildly. The CEL and misfire would come and go every couple of minutes. The next day the truck ran fine in the morning but on the way home from work the symptoms reappeared. It then progressed to stalling both at idle and at speed. Just as though the key was turned off, but it would restart immediately. The problem worsened as I tried to nurse her home. It progressed down to the point that just throwing it in drive would pull the RPMs down under 750-500 and cause the stall. This happened over about a week to 10 days as I was trying to diagnose. I checked Ford's work and discovered that ford had stripped the threading inside the engine block for the CPS bolt. After adding a longer bolt the issue cleared up for a few days but came then right back. So with some recommendations from the forum, I grabbed a new black CPS From IH and installed it. The truck ran great for a couple of weeks when the same old misfiring started to reoccur. Same chain of events as before with the truck eventually unable to go into gear. Another new CPS resolved the issue, for a week or two. Eventually three from different vendord (IH/Ford/NAPA) all failed. This is where the story dies off.

I had to undergo a series of spinal surgeries and fusions so the truck has sat for the last 5-6 months until I was well enough to get back under the hood. This is where the story picks back up. In my original post https://www.ford-trucks.com/forums/7...oent-work.html the old culprits of CPS & IPR were mentioned.

So I figured I'd dive into the IPR possibility this time and also happen to consider myself bitten with the Powerstroke Mod Syndrome bug and so ordered an Adrenalin HPOP along with a new IPR from Bob to go with it. Installed it back on the 4th of July weekend and it has run beautifully with more response and gitty-up-and-go than I've felt in a long time since the install........until today.

I hit a rough patch of construction on the I75-I70 interchange when the engine started bucking and throwing the CEL. And as always I never get a code out of it. however, as always, my OBD scanner does show a "mis" problem. However, the stall and RPM fluctuations aren't happening, so I think the IPR/HPOP solved at least that part of the equation.

I'm going to replace the IPS just for good measure and as a just-in-case, but I'm thinking I may have wiring issues. I've scanned the forum but nothing I haven't already addressed seems to quite match my trucks symptoms. I'm back seeking ideas from the depths of the forum....


Mods;
DieselHPS 4 pos flip chip from Tymar
Tymar intake
4.5" Exhaust
Powershot 2K
Water Boost Cooler
BTS: Trans with instant on T/C
Adrenaline HPOP
GFC bypass filter
on and on and on..........

 

I'm wondering if the UVCH is loose and when you hit the rough spots in the road that is what is causing your problems. Remove the valve covers and check them out. You can use the 50 cent mod to fix them or get the retainer clips from your Ford dealer.

 

That is what I am thinking Jim.

 

I'll open up the valve covers this weekend and tell you guys what I found. I'll throw the new harness and brackets in for good measure, even if they're not the culprits, while I'm in there. Thanks for the quick turn around response..

 

Good deal We'll be looking forward to hearing what you found.

 

Out of curiosity, what's the best replacement gasket for the covers?

 

The one that is there is reuseable. IIRC you have to get them from Ford and they are in the $70 range. This is due to the pass through connector for the wiring.

 

Took me a bit longer than I had planned to get a day I can devote to the fix. Getting my but kicked with long hours at work. But sure enough soon as I got the valve cover off the culprit was glaring at me. The latch was wide open . Even had a rubbed spot on one of the wires that allowed the wire to ground out to the engine block. With the new harness in place the truck drives like a dream. Took it out for about a 6 hour drive to make sure our gremlin had been exorcised. Thanks guys for the tip, runs like a dream!

Didn't have the time to pull the passenger side. Figure I'll do that as a preventative measure here in the next couple of weeks. What a headache that will be getting all that stuff out of the way. What's the best advise to proceed with that side?

One note; When I opened up the valve I realized that back when I installed the new Adrenalin HPOP, I must of created a leak with the fuel bowl. Under pressure it's a constant drip but nothing when the engine is off. Anyone know the parts # for the rubber/silicone compression bushings for the 4 hard-lines on the bowl? Ford stealer can't seem to look them up.

 

you can get a set of them from guzzle for about half the price........

 

Thanks found what I needed and it's on the way.