Well heres the scoop, its an '00 F550 7.3 handshaker. Been having nothing but problems with it...

The truck ran 'ok' a few years ago, but sat parked for about a year until i recently dug it out of the snowbank because we needed the truck.

Right off the bat everything started blowing up LOL

Somewhere their is something shorting out and keeps popping the #8 fuse under the hood and killing the running and dash lights. but thats minor detail, i can live without lights for now as the short seems to be hiding somewhere good.

Found out that their was a couple gallons of water in the tank and coincidently the lift pump calved out too. got that all cleared up, dropped the tank, flushed and threw a new lift pump on.

At the same time i pulled some codes on it, a whole pile of them... Most i chalked up to the fact that the thing didnt like running on 2 cylinders while pumping water through the fuel system LOL

Of the other codes, i was getting a 340/470/1316

Changed out the CPS (to the lovely grey one, all we could get at the time) just because it was cheap and easy

Went out for a drive around last night after i had everything buttoned up and did some datalogging.

Truck runs much better, but still has a stutter/miss... Drove alright most of the night, but the first time i walked on the skinny pedal it started throwing codes.

Now im getting 340/470/1316 again...

So looks like i need to do some checking of the wiring...

Any thoughts on things to check?

Im going to be pulling the valve covers to check those damn plugs for sure!

 

P0340 CMP Camshaft position sensor ckt. malfunction Open/grounded circuit, sensor fault, short to power

Bad out of the box CPS or a connector or wiring problem.

P0470 EBP Exhaust back pressure sensor circuit malfunction Biased sensor, open signal return

Bad sensor and/or tube needs to be cleaned. EBPS and Tube Cleaning

P1316 IDM Injector circuit/IDM codes detected Injector circuit failure/IDM codes detected

This is generally caused by a loose UVCH (Under Valve Cover Harness) and causes "stutter".

Try this procedure to check for loose connector or bad injector solenoids.



If you find any problems you'll have to remove VC to check the connector underneath.
Post results and we'll help fix the connector problem, or you can search for the 50 cent mod.

 

Great post Robin, some really good info there. Reps sent

 

Not too sure what the deal is on the EBP, the others seem easily enough resolved.

The EBP appears to be working correctly. While datalogging i was getting no irratic readings (maybe a bit high). I was seeing about 20psi off idle and about 40psi @ WOT @ 2500rpm

im going to just assume that the wiring has fell apart under the valve covers and causing that 1316 code LOL

 

Thanks for the rep Tyler, but it is nothing that hasn't been posted dozens of times by me or others.

 

used the truck all day for work. so far so good, runs decent other than maybe lacking some power (then again im used to driving my own truck) and a bit of a vibration that im assuming is a miss caused by a UVCH falling apart.

Tearing the VC's off tonight, hopefully i get one issue solved (crossing my fingers)

 

Well, didnt really get anywhere the other night.

Just crawled under the hood when buddy came back and needed some room in the shop to finish dressing the moose he just shot LOL

So i got as far as pulling the UVCH connectors and testing them with the DMM. both sides tested out alright, though that doesnt mean much as it could have just been 'lucky' and its making good contact at that time.

Being a bit short on time as i wanted to get out of the way (truck can wait, the moose cant LOL) i pulled apart the main engine connector and cleaned it (and the other connectors) as they were all pretty nasty looking.

Still a no-go. Has a very noticable miss/stutter when accelerating (still there at light load, but barely noticable) and still throwing 470 and 1316 codes.

 

When you dropped the tank did you check the in-tank filter?..........when they get clogged up they will cause a bad missing/lack of power feeling. Gotta do the in-tank mods and get rid of them.

An get a black CPS from Clay. The grey ones are junk! I just did mine and used a grey one and it was bad right out of the box. Got a black one and all is good now.

 

Cleaned out the intank filters, didnt bother to do any of the mods while i was in there. No intentions at all of ever 'hotrodding' this thing, its a service truck, not a race car, the factory setup should be sufficient.

(i realise its not the greatest setup, but it has never been an issue before on this truck or any other stock truck weve had)


Im on the fence about the CPS, i know the grey one are junk, but i doubt that it is causing any of the immediate issues. Im also on the opposite end of the world (may as well be) so buying from clay or probably any vendor on here is out of the question as far as the logistics/costs. I am definitely going to keep an eye out for a better one though, wouldnt hurt to at least have a 'good' replacement kicking aroud.

 

Yeah, but the dozens of times is what deserves the reps in my opinion. You are always there to lend a helping hand with easy to follow links and photos.

Phantom Reps sent at well.
(I have to spread it around first....d'oh!)

 

started pulling the VC's tonight...

Started with the drivers side, harness appeared to be 'good', it was backed slightly out of the connector, but the 'latch was still hooked and their appears to be the not-so-fancy clips shoved under the latch to keep it from falling completely apart.

So, no big deal there. next thing i notice is that injectors 1/3/5 were all identicle and #7 was completely different...

pulled out the DMM and checked them out, and this is what i got:

#1 - 3.7ohm
#3 - 4ohm
#5 - 4ohm
#7 - 15ohm

wiggled around the connector at the injector and the reading jumped around... Cleaned it out and now im getting a steady 4ohm from that injector now and no 1316 code! for now...

 

Did this clear up your engine "stutter"?

 

Make sure those little wire clips are completely in place over the top of the injector. Doesn't take much to knock them loose and lose power to an injector...
ASK ME HOW I KNOW! DOH!

Also make sure that none of the injector harness wires are rubbing aganst a rod or lifter under the VCs either. That is a known issue.
Once all that is done, before you reconnect the harness that goes over the Drivers side VC, check the underside if the wiring and make sure it isn't rubbing against the VC. This is another known issue.

 

the engine runs much better now with a billion times more power. but still feels like its got a slight vibration which could even be driveline related.

After about an hour of driving around, i finally got the 470 and 1316 codes again.

Still running good, but i can only assume that i have the same issue under the passenger side valvecover.

I did inspect the harnesses and everything for damage, all looked good. I had even fired it up in the dark before i put the valve cover on to make sure that the injector wires werent arcing out anywhere.

 

Got my hands on the Genisys now, going to run a buzz test and all that jazz tonight and see whatsgoing on...

Now im confused LOL

I was just playing with it quickly out in the yard and the genisys shows me code p0357 (Ignition Coil G Primary/Secondary Circuit Malfunction)????