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Old 12-11-2012, 03:59 PM
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Contribution test?

I am having a contribution and power balance test done thursday, when looking at the graph, I assume a dead cylinder will show below the target line and one that is hanging open will be way above the target line, right?

I have been having the white/grey smoke until the eot hits around 150*, then it's gone. Other than the smoke, the truck runs fine and starts up within 3 seconds every time.
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Old 12-11-2012, 05:19 PM
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Old 12-11-2012, 05:57 PM
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Quote:
Originally Posted by dfish1247 View Post
I am having a contribution and power balance test done thursday, when looking at the graph, I assume a dead cylinder will show below the target line and one that is hanging open will be way above the target line, right?

I have been having the white/grey smoke until the eot hits around 150*, then it's gone. Other than the smoke, the truck runs fine and starts up within 3 seconds every time.
yes look at this! this is a bad injector!

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Old 12-11-2012, 06:03 PM
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ehhh it's not THAT bad
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Old 12-11-2012, 06:06 PM
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Originally Posted by sinner6.0L View Post
ehhh it's not THAT bad
That's just idle when it was under load WOW!! but you are correct it is not in the 30 or 40 range
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Old 12-11-2012, 07:21 PM
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That looks like one that isn't firing at all. Mine acts like a cylinder or two is running too rich, IE white smoke that'll burn your eyes, but isn't enough to cause the truck to run rough.

Would it be safe to say that an injector that is hanging open will show real high on the graph? Or do the graphs look just the same either which way is happening.
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Old 12-11-2012, 08:09 PM
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Originally Posted by dfish1247 View Post
That looks like one that isn't firing at all. Mine acts like a cylinder or two is running too rich, IE white smoke that'll burn your eyes, but isn't enough to cause the truck to run rough.

Would it be safe to say that an injector that is hanging open will show real high on the graph? Or do the graphs look just the same either which way is happening.
then it will be up not down!
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Old 12-12-2012, 02:47 PM
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yeah I've seen a few that were up. actually #7 on mine is higher than I'd like
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Old 12-12-2012, 03:08 PM
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Did you get that done at a Ford dealership, and what was the cost?
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Old 12-12-2012, 03:11 PM
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That's all I can think of it being is one hanging open just enough to smoke but not run rough. The guy asked if it was having trouble starting or anything typical and I told him no, just smoking when it's cold.

And on top of it all today, I think I have a 2-3 or 3-5 flare, didn't surge or buck or grind but did the rev up 100rpms then go in gear. Fluid has less than 10k on it and the filter and screen are new motorcraft. It's always something. Still goes in all gears fine and lockup shows no slip.

Cost was $115+ tax yes at the dealer, gonna do the test in the morning when it's cold outside, temps should be in the low to mid 30's.
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