Hello, New to this forum and was hoping I could get some help in tracking down some problems.

Ive got a 1995 F250 with a 7.3 & 5 speed. The trucks been running great the last few weeks after its been sitting for over a year. I just recently changed glow plugs, relay, and uvch.

I was heading back from the post office, accelerating from 45mph to 55mph when all of the sudden the truck lost most power and started running really rough. I pulled over at the gas station, shut her down, read codes and came up with P0603, P0236, P0237. Truck has a very hard time starting back up and will barely idle. No visual leaks. Can hear an odd sound, hard to explain, but almost sounds like a cylinder is dead, hollow empty ignition sound ... I unplugged the map sensor, same issues. Truck has low miles on TS 6, Baby Swamp Injectors, wicked wheel, and a rebuilt turbo. Boost has been reading 14psi max (off map sensor), I believe I have a small leak in up pipe thats causing the low boost.

Any help would be appreciated, this is currently my only vehicle. Ive got a full T4 kit and e fuel set up ready to go in but was waiting until I got a new job and another vehicle to drive while Ive got my truck torn apart.

 

Check the cps then valve cover gaskets. It sounds like a valve cover gasket to me.

 

What kind of uvcg did you get? Your symptoms so like that could be the issue.

 

Alright, so after letting the truck sit for 5-10 minutes I went back out and started her up. It barely started and was still running rough. After a couple seconds the idle smoothed out and sounded normal again and had quick throttle response. Just as I thought the problem fixed itself the idle dropped down and was running really rough again.

I replaced the cps with my spare. Problem is still the same. I examined all 4 outer uvch connections and they all look good. I installed the one piece UVCH/Gasket from Accurate Diesel. I really wish I had a way to buzz test the injectors as that would really help out.

I did notice that the ccv seems have a hell of alot of blowby. I have not seen it with the hose unplugged so im not sure if its been like that or not. Seems a bit excessive though.

 

Im going to try to track down any fuel problems. The filter definately needs changed but i dont think that would cause such a sudden problem. I'll have to try and find a gauge to read fuel psi.

 

Fuel pressure is always good to know. Another thing that you could check real easy that may cause an issue is the tin nut on the back of the hpop. Although I don't know if that would cause your problems

 

ICPpsi and IPR% are both reading good. I dont think hpop is a problem. Hpop is newer. Fuel bowl is newer. The amount of blow by coming out of my ccv has me concerned though.

 

Im thinking I may just park the truck, pull the engine and rip it apart. I was planning on possibly doing a full rebuild before throwing my IDP T4 kit and bigger injectors on. I'd also like to pull the entire engine harness, inspect and ohm test everything, and re-wrap it. I had the godzilla of packrats nesting in my inner fender during the year that the truck parked.

 

Did you check the fuel pressure? If that checks out you may try wiggling the connection at the IDM and see if it makes any difference. Having a live in rodent can cause some unique problems

 

Due to the design of the piston rings in these trucks the seem to push a lot of blow out.

 

Didnt have the time to do anything today. I just went out and tried to start it up and it started up rough, idled really bad for a few seconds and then smoothed out and sounded good. About 10 seconds later it started stumbling again as if its missing. It almost seemed like it will run fine until the computer picks up a bad reading and screws it all up. Possibly a bad sensor... I put a new cam sensor in yesterday but it didnt help. I havnt been able to get a gauge to read fuel psi yet but I cranked it over with the filter cap off and the fuel level in the bowl rises quickly and creates a vortex with the incoming fuel, so it seems good. IPR % and ICP psi all check out. The IDM is about 4 weeks old and is the Swamps HF/HV unit.

Anyway, im picking up a Suzuki Samurai tomorrow to be my new vehicle while my trucks down. Im also going to be trading my new 7.3 performance parts for a fresh rebuilt 12v Cummins, ZF5 adapter, and a spare ZF5. So the 7.3 will be coming out regardless. It would be nice to sell the 7.3 as a runner though.

 

UPDATE

Got back to work on it today. Decided to unplug the outer uvch plugs one by one while it was running to try to pinpoint if its an injector. Found out that I can unplug both passenger side plugs and it doesnt effect the current running state. Seems my entire passenger side bank is down. I removed the loom from the harnesses as far back as I can without having to remove the whole harness and couldnt find any damaged wires or possible shorting.

From what I can find out online it could be either a wiring issue, idm issue, oil issue on that bank, or possibly a single injector solenoid thats shutting down that bank. The IDM is new Swamps and ive been running it fine for the last couple weeks. Injectors are also low mile Baby Swamps. I,ll have to get a decent multimeter and check the injectors, and then the harness if the injectors are fine. Hopefully its not the IDM.

 

I would start by testing the uvch and connections under there.

 

I may end up having to. I just replaced both uvch with the one piece units from accurate diesel that eliminate the plug on the inside. I highly doubt they are damaged. So far the harness is looking good. Im assuming im down to IDM issue or injector issue. I ordered a bluetooth obdii reader and will use car gauge pro so i can buzz test and cylinder contribution test it. I might as well pull the entire harness, test it, clean it up, and re-wrap it anyway since I have a bunch of plugs i need to replace (coolant temp, alternator, ac). I'll check the injectors through the uvch connections with a multimeter. If they dont check out then I'll be pulling the valve cover. If the injectors and harness all check out then I'll see about sending the idm back to swamps for repairs.

 

I was thinking about trading about $4000 worth of new and used aftermarket 7.3 parts that I have for a fully rebuilt 12v Cummins, tranny adapter, and extra zf5. Then pull and sell the 7.3 but im not too sure. It would be easier just rebuilding the 7.3 and installing the turbo kit and parts I have. All that I still need for a 500+hp truck are injectors and t500 hpop.