Reading a power balance test

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Mar 29, 2018 | 07:58 AM

NCMODELA

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Reading a power balance test

Hi all. I have a rattle or predetonation ping at high rpm under load. Ford did the test on this and this is what it looks like. They said van is not worth the money to fix with this issue. 2011 Ford e350 v10. Noise seems to go away with higher octane. They said cylinders 10 2 abd 9 are misfiring. And 6 5 7 are close. The compression test came back with 0% for all cylinders.

Mar 30, 2018 | 09:30 AM

krewat

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First things first - did you clean the MAF and change the fuel filter yet? Under high load would indicate a possible loss of fuel flow making it lean out.

When were the plugs last done? Did you remove the COP on Cylinder #10 and see if the boot is dirty?

Mar 30, 2018 | 09:37 AM

NCMODELA

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Yes. New MAF and new in tank fuel pump. There is no external fuel filter. Plugs were done 5k miles ago. The dealership did them. I have not checked the boots.

Mar 30, 2018 | 10:44 AM

krewat

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is there a vacuum-actuated fuel pressure regulator?

Mar 30, 2018 | 10:57 AM

NCMODELA

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I am not sure. I will look at the one on the motor.

Mar 30, 2018 | 02:22 PM

NCMODELA

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Also I spoke to 5 star who had me run some diagnostics on the motor didn’t see it leaning out at the time it was pinging.

Apr 4, 2018 | 07:27 PM

NCMODELA

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These are the O2 sensors. 2nd pic was replaced 5k ago.

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Apr 5, 2018 | 11:29 AM

NCMODELA

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To me they look carbon fouled. Like it’s running to lean. But the AF mixture is not lean. Is there anything else that will cause carbon fouling?

Apr 5, 2018 | 12:35 PM

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rock2610d

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To me that looks like coolant, deposits.

isn't carbon fouling black?

Apr 5, 2018 | 12:42 PM

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NCMODELA

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I was going off of this. I had a relative compression of 0% between all cylinders. If it was a head gasket would that not be off for at least a few cylinders?

https://www.google.com/search?safe=a...i98jlhWTCcr0M: