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Having trouble with the check engine light coming on at various times while driving. When this happens the truck starts missing, and gives the impression it is running off of 4 cylinders. If you turn the key off for 10 seconds and back on check engine light goes off and it runs really well until the next episode (which could be in 3 minutes or 3 days). Any ideas? 94 F350 Powerstroke 7.3. All input welcome
Pull the uvh plugs one at a time when its running. If it makes a difference in the way it runs then that one might be bad. See if it has burnt pins in the plug. Reading codes is always nice.
Your going to have the truck scanned with a compatible code reader, store code readers don't work with our trucks. Just a guess here but check your valve cover connectors, to check for any burnt pins, also the UVCH (under valve cover harness) become loose making the truck misfire.
I just had codes ran by a diesel shop. They said they could not find any codes. When I left there it was kicking on the check engine light every 3 minutes. So I stopped at Napa on a whim and changed the right side valve cover gasket and harness in their parking lot on a whim. Surprising it was a 75% improvement. Within a couple days I had changed left side when I returned to Kentucky. Huge improvement, but the check engine light still kicks on occasionally with the same symptoms
Yes I replaced pigtail harness underneath valve covers. I have not replaced four big pigtails going to the valve covers that lie on top the intake. What is the ICP? Is that the high pressure oil pump? How do I check that?
The ICP (injector control pressure) is on the drivers side head up towards the front. If where the plug plugs in at has oil in it, its probably bad or going bad. I don't know about that diesel shop, if its flashing the check engine light then there should be a code.
You need to find a shop that can obtain the codes (or get them yourself). It ALWAYS throws a code; when everythng's fine it throws a P1111. If the shop didn't at least get that, their equipment can't communicate with your truck.
I looked at the engine, but I didn't see anything screwing into the head. I took photos which I will try to post. Two look to go into the intake, and the third looks to go into the timing cover. I will try to post photos
It's POSSIBLE a failing HPOP could produce so little injection pressure that it could throw a code. Doing ANY troubleshooting of a truck with the CE light on, without obtaining codes, can get REAL expensive REAL fast. And REAL frustrating.
There IS a code; if that shop couldn't at least see a P1111, and cannot read real-time data like ICP and IPR duty cycle, they don't have the right equipment to work on your truck. The DIY tools to communicate with our trucks have gotten crazy cheap lately. Do you have an Android device and/or a Windows laptop/netbook?
If you remove the ICP, oil will shoot out that port when you crank it, and the engine will probably not start. DISCONNECT it and see if it runs better. Also check the connector for oil. Oil in the connector means the seal inside the sensor has failed, and therefore so has the sensor itself.
It may be that there scanner won't connect to it being that it's a 94 I know a 94 truck won't work with most scanners something about needing flashed I think
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