Hole in fuel tank = watered system! - Ford Powerstroke Diesel Forum
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Old 02-12-2014, 06:43 AM
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Hole in fuel tank = watered system!

My 05 6.0 has been in the shop for about amonth. truck would act like it wqs gelling up every other day or so til it happened 3 times, last time it wouldn't start. Fuel tank had ruptured on top, and was letting dirt and water in slowly... killed my fuel pressure regulator. also replaced fuel pump/water sep, new fuel tank, FPR, water pump. got it back and immediately I noticed it has a slight miss to it at idle and highway speeds. I have a local shop put scanner on it came up with: (cant remember actual code numbers)

Cylinder#8 misfire

EGR codes (which it is deleted so I expect that)

Low exhaust backpressure (I have straight pipe so not sure if this matters?)


I had a chip on it for about 3 weeks and sold it other than that it has straight pipe, intake cai, coolant filter and egr delete.

I do not have a good scan tool nor do I really know anyone who has.

To add to this, I can only make 19-20lbs of boost and any giving situation. turbo fluctuates sounds a lot like vanes are opening and closing while the truck sits ideling. any help would be appreciated!!! Im figuring on replacing 1 injector and installing 03 turbo.

Thanks
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Old 02-12-2014, 07:03 AM
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The misfire could be from a valvetrain problem, or air in the back of the head.

The backpressure problem is not because of the straight pipe, it's because a bad EBP, or a broken flange on the exhaust pipes, the ''y'' pipe.

Did you got and injector serviced? Does anyone took off your HPO Rail?
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Old 02-12-2014, 07:08 AM
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No valve covers have not been off since ive owned the truck..

I will check for the y-pipe broken today...

So you think that for sure I have a bad EBP sensor, or need to clean the exhaust backpressure tube??

Thank you very much for your reply
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Old 02-12-2014, 08:18 AM
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Get a monitor before you run down the road blindfolded!

If you had water in your fuel, it is possible you have damaged an injector, probably a nozzle. If it smokes or even hints of a slow-crank (hydrolock), get it fixed right away, because if it is cracked you may soon damage the piston.

If you have a miss, expect the boost to not get above 20 psi on a stock truck.
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Old 02-12-2014, 08:35 AM
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no smoke at all... no slow crank, cranks fast but it does have to crank a few times before it fires up...
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Old 02-12-2014, 08:50 AM
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The #8 misfire could be unrelated, but it is a place to start. A buzz test and a power-balance contribution test is well worth the cost since it is the labour cost (and time) that will be the kicker. It would be better to know you have other weak (or good) injectors before you start opening it up. They don't throw codes unless it is really bad.
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Old 02-12-2014, 08:59 AM
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are all these tests done with a scanner??
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Old 02-12-2014, 09:28 AM
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Exactly, they are. Also you could take the harness off each injector at one time to test them, if you can hear the miss, then the injector is good, if you can't hear it fail, probably you have a bad injector.
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Old 02-12-2014, 10:14 AM
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I will try this as soon as I get home... do you have to pull the valve cover to unplug each injector individually?
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Old 02-12-2014, 10:27 AM
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Nope, it has the harnessess near the intake manifold, in the inside of the ''v'' that the engine forms. You can try looking for the FICM, and following the cables into the injectors, there are 8 of them. Round and they have 4 pins.
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