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Message: [QUOTE="TARM, post: 670824, member: 578"] I have had something plaguing my engine for some time. Engine seems to be running a bit rough. It has a rough somewhat lope idle. When dropping down to a stop the idle is even rougher but smooths up one stopped. Its those little things you notice when you know your truck. Something is just not right. I am getting a hard CEL every time it starts and it does NOT go out. IDM codes: P1316 (Generic IDM code) The P1271-P1278 type codes. (Specific cyl below) Cyl 1,2,5,8 High to low side open (as these codes indicate the issue is showing in both banks. This starts to lower indications its a wiring harness.) Any IDM failures I had seen were always total failures. A entire bank or the whole unit. The least I saw as a complete loss of one cyl injector. But never any thing partial so I discounted it being the actual IDM. Here is the diagnostics done: * Ohm'd out the complete harness from IDM connector to injector so it covers the full travel. - All circuits registered 3.0 ohm (In spec and normal according to IH and Ford being 2.8-3.6.) * Buzz Test All sounded very loud and consistent. [I](These are new injectors that Nate had to replace a defective nozzle on. He went thru them in great detail and checked all specs. 200% hybrids)[/I] * Just to be completely safe the UVC harnesses were replaced and the full harness was rechecked @ 3.0 ohms. Nate had just gone thru these injectors as he had to fix a defective nozzle. Awesome guy BTW with great customer service. I had told him about the codes prior to him getting them in the mail so he meticulously went thru them to ensure it was nothing with the injector that was wrong or out of spec. Well anyways I went thru a ton to testing and replacing parts to fix the rough idle and the codes. Finally I dug up a IDM my good friend Addison had sent me for free so I could save some money by turning it in as an extra core to Swamps as I wanted one of those cool HV HF IDMs. If I had done that the issue would have been resolved as well. Figures it was the only upgrade I did not make and one of two I really needed LOL I plugged in the IDM and ran the Buzz Test for what must be the 100th time The read out came back: TEST COMPLETED SUCCESSFULLY!!!! Moral of the story. Do not be a Dumbass as I was and ignore the obvious and what the testing is telling you whats wrong. If you get these types of IDM codes: Check the connections at the outside of the VC. Check the wiring harness where it touches the VCs for burnt or exposed wire. Then pull the IDM connector as this will allow you to check the entire harness as well as the solenoid. If they all ohm the same or within 0.1 of each other and are all within the 2.8-3.6 spec then............ Swap out the IDM as the next step. This is way faster and easier than pulling VC and swapping injectors or solenoids etc in an attempt to trace the issue unless its the ohm out procedure indicates this to be the issue. As I see it all you do is risk causing new issues by not getting everything connected back fully etc... I was able to do all of this and swap out the IDM after testing in a total of 1 hr not rushing at all. Basically I used these issues as an excuse to replace just about everything related to the injectors and hpop system LOL Not to mention a few other things since well everything was torn apart anways. That was the excuse I gave the Mrs anyways LOL * Borg Warner CPS CSS1603 ( this is a duplicate of the old Black original CPS. Its grey but its full sized and has the same hall sensor specs, centered and right at the surface tip (you can see it thru the plastic) Test your intermittent wipers. If it causes engine surge or cuts out the Wiper motor is going bad and throwing interference thru the ground wire. It shared a common ground with the CPS and PCM (Can you say stupid) Cut the wiper ground where it joins and ground it by itself somewhere else. This will solve the issue. Advanced Auto with online coupon TRT30 and choose in store pickup $18. Huge dif in idle compared to Ford Grey) * Ford IPR * Ford ICP * Ford Glow Plug Set * Ford Glow Plug Module * Ford Under Valve cover Wiring Harness Set * Stealth SPR 1.1 HPOP * Melling LPOP * HyperMax Intercooler * 6.0 Trans Cooler * Inline Trans filter * IH Coolant Pump (has intergated bypass filter) Hoping someone may learn something from my mistakes. [/QUOTE]