Hey guys
Well I did my first big trip over the past week towing a trailer/ toy hauler. Did well on the way up to where we went (about 3.5 hrs away). Drove down the beach fishing etc. All fine.

10 mins into trip on the way home lost a heap of power. Felt like a few cylinders shut down. Managed to read codes and P1316 came up. Got a bit of powet back after shutting it down a few times and now it seems missing on 1 cylinder. Managed to get off the side of the road and limped into another town. Did a buzz test and it failed on cylinder 4 but i can't remember the code. Took valve cover off to check plugs etc. It was popped out on one side a tiny bit but once pushed home didnt make any change to the way it run. The connector from main harness was ****. Wiring was showing through on some. Taped it up to reinsulate the wires. Again no change. I will be replacing that once I manage to get the pigtails
Did a contribution test today Came up with a P0272 again relating to number 4. And obviously engine light wont go out.
What am i missing or What else should i check?

Cheers In advance

 

To add to this I just ohm tested through the 42 pin connector and all 8 are showing under 4 ohm.
did the test with disconnected batteries and no key in.

 

In my opinion, check the small and obvious things like ICP for oil and tin nut on IPR UNTIL you get the faulty wiring straight and fixed. You could also look at the chef spot on the driver side of the 42 pin connector for issues.

Until you get the electrical wiring sorted, you might be chasing gremlins...

 

Cheers Sous. Yeah checked all that whilst I was leaning over all of it and taking note on what needs to be done and what looks good.
Been trying to get pigtails and harnesses today. No such luck so far. Nobody here keeps them on the shelf as the trucks are not common here. The one place I can probably get them from is shut for Xmas and new year. But.... I know they will want about $300 for the one side.
Gonna have to build my spare parts up a bit more I think.
42 pin connector is ok. Pulled the harness out the IDM and PCM and checked that last night. All seems ok. No rust. No leaking water out connectors or anything like that. Ohm test come back ok apart from cylinder 4. Come in at 2.2 ohm which i already kinda diagnosed since my last post. Most others were aroud 3.5 to 4

Error code come up as a high to to low side short cylinder 4.
I'm pretty sure this is a wiring issue with the plugs in and around valve cover. Just can't do much else until I get parts.
Only other thing i can think of is the injector solenoid. Is it common for them to go?

 

Inspect the harness that goes to the 42 pin connector where it passes over the valve cover. The underside can chafe on the VC and cause shorts.

When reporting codes please report the actual code.

On your trip did you encounter any serious water like a rain or cross a stream? Water intrusion to the IDM is a common problem. That will pop a P1316 as often as a loose UVCH connector.

Injector solenoids are a rare failure.

 

secondary code after buzz test is a P1264 P1264 - Cylinder #4 High To Low Side Fault

Diagnostic Trouble Code details

Cylinder No. 4 High To Low Side Short
Have checked both sides of the 42 pin connector and I can't see any bare wires or ones that have broken out if the connector. No rain whist we were away (summer here and half the country is on fire it's been that hot) and no water crossings at all. Closest we got to any water was fishing on the beach and we didnt drive through salt water either. Just drove onto sand and parked up.

 

Did you ever figure this out?

 

Update to this:

Taking a while due to shipping times etc. Unfortunately being over here means waiting on parts. Unless I want non genuine and to hand over my first born as well as bent over and pineapple firmly inserted, oh and money on top of that as well.

Anyway so I have replaced the UVCH , gaskets and pigtails . The original connectors were bare wired in spots so I'm sure this caused a short. Done both banks now so that's all good. Ran a buzz test. failed cylinder 4 again. Same code.
Now I knew for certain the harnesses were good and i had good connection back to the 42 pin harness. Process of elimination. Had to be electrical as its a short. So it leaves the Injector solenoid and IDM.

So I swapped the injector solenoid from #4 to #6. The code followed the solenoid changing from P1264 to P1266.
but the 1264 remained. I disconnected batteries for a bit. Cleared codes again and run another buzz test. The 1264 went and the 1266 remained. Started it up and no oil was flowing out of the injector with the suspect solenoid.
So now I have ordered solenoids from Riff raff and should have them by Friday, if not next week. Along with other bits I ordered for while I'm in there i may as well do it.
RR 4/4 wheel and 360 bearing , OCR, FRX, HPOP lines, 6637 are all being done too. Mishimoto overflow/degas has gone in cos thats the same price as a plastic one here and I would still have to wait for it. just waiting on the trans cooler to get here. Mishimoto too. Bout the same price as a new 6.0 cooler with shipping.

So...... if after doing all that and the code is still there it would probably be the IDM. But I'm pretty confident it is that solenoid.

 

Appreciate the update.
I had the P1316 code and using ForScan ran the KOEO Injector Self Test. The first time it listed cylinders 2,3,4,6 has high to low circuit failures so I cleared those and ran the test two more times but got no error codes. Thus I am confused and wondering if it is due to an intermittent electrical problem.

 

It could be an intermittent electrical issue you are having. Mine wouldn't complete a CCT either and threw up another code relating to cylinder 4 so maybe try one of them too.
inspect the harnesses both sides. Mine were shocking.

I had no issues with my car up til it did this. No warning whatsoever. But obviously the harness was already bad. Must have hit a bump on the right angle then it caused all this drama.

This is what you guys call drivers side. Dont take no notice of the sealant. Was a quick fix to get me home and stop them from touching.

passenger side. not as bad but still not good.