Hey guys, would just love some input, my programmer was telling me injector 1 and 2 throwing code P0266(contribution/balance power cylinder, valve train or injector), so I changed injector 1 and 2 put it back together, changed oil and filter and it ran smooth for a minute and then started throwing the code again for injector 2 and smoking like crazy. I then took it to ford and got them to check it out, telling them what work I had done to it. They performed some tests saying this "confirmed contribution fault for cylinder 2, performed power balance test, found #2 miss, performed relative compression test, passed. Performed electrical injector test, all injectors passed. Checked ipr and icp values, within spec". Then suggested to replace injector 2 out. I then swapped injector 2 with 4 put it back together and cylinder 2 is still throwing the P0266 code, so to me it's not the injector, right? What is my next step? Chip monitors FICM voltage(stays above 48), injector pressure looks good(starts at 500ish), I was thinking the injector harness but with what their report said now I don't know. Maybe fuel filter/fuel pressure?

 

Injector harness maybe.... Could have a short.

 

Thanks for the reply uncle mark, unhooked the chip to rule that out also, truck ran rough last night then this morning it was purring like a kitten, so yeah seems to be intermittent, there were some bare wires so I examined them, they did look ok, would they have a common ground that if it were the ground I would have a problem with more than one? Which wires on the plug should I check and I guess just when it's running rough hey?

 

Those are question best answered by the electrical guru's here other than myself. I dont know the technical ins and outs other than that. Sorry bud.

 

you did not say what engine, miles, and operating hours...so our guess could range from ravens flying over head sprinlking voodoo dust on your truk to anything and everything folks can think of.

one of the many replies you will get , assuming you have a deisel, and its a 6.4, and your miles hours ratio looks something like 80k miles and 3000hrs. contribution/balance , quite often is a valve system geometry problem.

a. you could have a bent push rod.
b. you could have the ball drop out of the rocker arm
c. you could have worn rocker tips
d. you could have a bad lifter, or a lifter that is not hydraulically functioning correctly (gummed up, oil to thin to seal the lifter, mechanical problem with the lifter such as mushrooming, etc)
e. you could have a damaged cam lobe

seriously, I could probably list a dozen more guess'es.

a test you can do is , after the engine is warmed up, clear all the codes, then let the engine idle with no pedal action...clock how long it takes to get the contribution/balance error. note the time it took to get the error, then clear the code...run the engine while keeping the idle between 900 and 1100 rpms.....do not let it drop below 900 rpms. if you do not get the contribution/balance error on the second run, but got it on the first, you have a valve train geometry problem as described above.


let us know what the solution is.

 

yes, that because the AFR mix is different on a cold/cool initial startup morning than when the engine is warm.

 

It's a 2007 6.0 with 250k+ on it, per his profile. He clearly gave values for the FICM, and mentioned ICP and IPR.