Contribution test?

[dfish1247]

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.

[g2shuck]

subscribed

[JUGERNAUT]

Originally Posted by dfish1247

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!

[sinner6.0L]

ehhh it's not THAT bad

[JUGERNAUT]

Originally Posted by sinner6.0L

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

[dfish1247]

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.

[JUGERNAUT]

Originally Posted by dfish1247

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!

[sinner6.0L]

yeah I've seen a few that were up. actually #7 on mine is higher than I'd like

[crazyfrog1983]

Did you get that done at a Ford dealership, and what was the cost?

[dfish1247]

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.