Fuel, HPOP, Injectors?

[beerknight]

I have a strange problem. When the truck is warming up, I have a miss in one of the cylinders. As the truck continues to warm, the miss seems to infect other cylinders. If I pull out of my parking spot and smash the throttle to the floor the truck blows lots of black and blue smoke. But the misses start to go away. Right off the bat I think its an HPOP problem. So in an effort to find out if my pump is making the correct pressure I purchase and install a HPOP gauge. I am to understand that the high pressure oil is between 450psi(at idle) and can go as high as 4,000psi(maximum engine load w/ max throttle). That being said my gauge tells me that everything is fine. Back to square one. I spent the money on an Auto Enginuity scan tool and the Ford enhanced bundle. Did an injector buzz test. The truck was cold. Wasn't driven the previous night or during the day. Buzz test showed that all injectors were responding correctly. I started the truck let the oil get warm enough to do a contribution test and discovered that the #8 cylinder wasn't firing. As the truck got warmer it started to run more and more like skat. I repeated the contribution test and it said that 2,4 and 8 were not firing. Shortly after completing the test, yet more misses, until the truck killed itself. I let it sit for a minute while doing a second injector buzz test and restarted. It still had a few misses, but the truck started and ran.....

Long story. And now the question: What the heck is going on? Could it be a problem of fuel pressure not getting high enough to support the injectors? Perhaps air in the fuel system? Maybe I have an "o" ring in the HPOP that's leaking off a small amount of pressure? I replaced the injectors(all 8) two years ago, so I hope it isn't that. All of the cylinders that were missing in the contribution test were on the drivers side of the engine. Maybe the problem is located there?! On a related note, one of the cylinders continues to miss when I'm on the highway and below 1800 RPM's. When I smash the pedal, it goes away.

[timmyboy76]

definetly seems to be on the d/s as noted. Check the UVCH connections, inside/outside the vc. Maybe the remedy will be a quarter...(50 cent mod). Check also for burnt pins, if so, then a new gaskets' in order..

[beerknight]

To be honest, I should just change the dang gasket. When I did the injector job, I change the passenger side. But failed to do the driver side(it seemed to be in excellent shape)

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[beerknight]

So the plot thickens. I replaced the driver side gasket/harness. No change. Plus I found an exhaust leak at the turbo(check the pic). I don't know if that's relevant. I did further contribution test and found that the problem isn't restricted to the driver side of the engine. Now what?

[beerknight]

description of codes: P0269 Cylinder #3 Balance Fault, P0266 Cylinder #2 Balance Fault ect.

[timmyboy76]

looks like a turbo rebuilds', in order. Remove the oil cap ,and flip it over onto the oil fill tube, see if theres pressure, while trucks' run's idleing.

it could be the idm / pcm but you'll have to do a test at the 42 pin connector..(location at d/s vc). Google it, you'll find what specs to look for.

the "machine" you used to find the codes, can you do a buzz test / cyl contr. test with it?

[Toms01PSD]

Originally Posted by timmyboy76

looks like a turbo rebuilds', in order. Remove the oil cap ,and flip it over onto the oil fill tube, see if theres pressure, while trucks' run's idleing.

I never understood what the point of that was...

[beerknight]

AE scan tool. And yes I have done a buzz and contribution test. That's how I determined the miss was jumping around. Old Ford mechanic friend of mine told me to change the crank positioning sensor. There's a slim change that its giving some crazy info. i already own an extra one, so I say why not.

[beerknight]

Originally Posted by timmyboy76

looks like a turbo rebuilds', in order. Remove the oil cap ,and flip it over onto the oil fill tube, see if theres pressure, while trucks' run's idleing.

To determine if the engine is producing "blow by". High pressure in the oil system means bad rings and low compression. Among a few other things.

[timmyboy76]

i should've started a new paragragh, between those two sentences. So, whatsthe results of the oil cap test...try'n to get everything "out on the table".