Hi All,

I recently did a lot of upgrades/maintenance to my '99 F350 in my signature. I drove approx. 1k miles without any issues but now I'm getting an ICP code and the Service Engine Soon light is coming on. Here is what I did:

Rosewood 160/30 Injectors
CNC Stage 1 HPOP
Jelibuilt Tunes
New ICP sensor - OEM from Riffraff
New IPR - OEMM from Riffraff
New engine harness - OEM Riffraff
Regulated return Irate (did my own filters)
New pedestal blank
Turbo wheel 4x4 from Riffraff and new bearings
New HPOP lines - new OEM Riffraff

I'm probably forgetting a few things. Here is my question: Where would you start to trouble shoot? From what I understand it could have been several things I touched. The truck is running and and starting perfectly. The trouble code is intermittent and usually doesn't stay on long. It will do it both at operating temp and sometimes when I first start her up or even while waiting on the glow plugs to turn off with key on before starting.

Like I said, she runs and starts great! When the light comes on she seems to not run as good but still has power and will drive ok. I'm thinking something electrical since it's intermittent. She did not do this prior to digging in. Truck has around 243k miles and has always run pretty good. I've owned her since she had just under 60k miles, 2nd owner.

Thanks for any help or ideas to pursue.

The specific codes are:
P1280
P1316

 

Probably just icp dropping some getting on it in a hotter tune. It's pretty common code with a tuned truck.

 

Run a buzz test, Josh, and see what IDM codes you have, since you have a P1316.

How does the ICP pigtail look? Might be worth wiggling the wires there while checking continuity between PCM and ICP. That P1280 says the PCM can't trust the ICP values it's getting. With a new OEM sensor in place, I'm thinking the wires are next to check.

 

-TPayne, It does it just idling or even not running. Plus I upgraded the HPOP.

 

I'll look into running the buzz test, thanks. The harness and pigtail are new, OEM from Riffraff. I looked at them yesterday too, and I don't see any rubbing or obvious damage.

Even though the new ICP sensor is new and OEM, would it make sense to try to just swap in the old one to see if that does anything?

 

I swapped in the old ICP sensor yesterday and inspected the new pigtail area and other visible areas of the engine harness (which is new from Riffraff). No joy. New development too. The engine shut down a few times the other day while sitting at idle. I was talking to a neighbor and it shut down 3-4 times and I limped it home (100 yards away).

Today I'm digging into the ICP pigtail testing, IDM testing and inspecting where the 42 pin connect can rub against the valve cover. I read this was one person's issue. When the engine harness is replaced, this section of wire (from 42 pin to fender area) is not part of that new harness.

I will continue to update progress and hopefully my solution. Thanks for the help so far.

Also, I hauled trash recently and on the way home I gunned it pretty hard, hitting around 3k rpms. This is with the hydra on Jelibilt's daily tune, which is where I usually leave it. I got an incredible amount of black smoke out of the tailpipe each time. I don't know if this can be related to my issue or is just how their tune and my upgrades are. Normal driving and it doesn't do it.

 

Hello Folks!

I just got done testing the IDM after pulling off the driver's side fender liner. She passed all tests including the grounds. Range in ohms for the injectors was 2.9 to 3.1 ohms. Does this mean I need a new IDM? Where do I source one if so?

Could it be something else? I put all the work and new parts I did in the first post.

Thank You!

 

For idm and pcm use diesel technology of Chattanooga. They are the go to for that. They can test yours as well.

 

What are the results of the buzz test?

 

I had to order the cable for FORScan to connect to my pc. My phone wouldn’t let me do it. It should arrive Tuesday. I will follow up here once I can do that.

I peeled back the wire loom leading to the 42 pin connector. All looks good there.

The nut on the ipr is tight.

all connections seem tight.

i have not removed the valve covers yet to see if a wire got pinched. I read that was someone’s issue with similar codes.

 

Hello All,

I ran the buzz test. The injectors all buzzed and individually all sounded good. I got Code: P1274 - Cylinder No. 4 High To Low Side Open.

So I pulled the driver's side valve cover and inspected the UVCH wires going to cylinder 4. It all looks good. No abrasion or bare wires.

What should I check next? I did test the IDM plug when everything was together and got 2.9 to 3.1 ohms on all injectors.

Should I switch the injector plug to a different injector to see if it follows the wiring? Any suggestions?

FWIW: The driver's side UVCH and gasket are 4-5 years old, replaced with OEM and only have around 15k miles. The passenger side is brand new, OEM with only 1000 or so miles (no issues on pass side).

Thank you as always.

 

To switch the injector plug to a different one and run the buzz test again for a quick solenoid check - will the plugs reach, or do you need to cut the zip tie to do it? I've not tried that before, but it sounds like an easier yet effective way to test, instead of swapping solenoids. Just don't try to start it that way!

 

Hi Jeff,

I couldn't see how the plug would reach the other solenoid so I switched injectors 2 and 4. No change. Still getting cylinder 4 code P1274.

I've swapped UVCHs and no change.

Is it time to get the IDM sent off for testing? When I tested the IDM plug to injectors everything tested ok.

 

Yeah, once the wiring and solenoids are eliminated, IDM is likely next.

 

Did you clear the codes before doing the buzz test and reading again? Recommend doing this a couple of times with the injectors swapped and make sure.

Also, were you wiggling wire bundles while checking for opens? The wires to cyl4 may look good (have continuity) when not disturbed.

Another thread where these high to low side open issues ended up being an injector.

Please help!! 7.3 high to low side open - Ford Truck Enthusiasts Forums

It's probably good that you are swapping injectors and not just coils to narrow down the cause.

Tugly was noting in another thread: "I know of one other member that had a code, and it turned out to be the injector itself - after he swapped the coil with no change. If the plate fails to pull up fully, it increases the current through the coil - and the IDM can detect this."

P1271 - #1 Injector High-> Low Side Open - Ford Truck Enthusiasts Forums