Injector quiestions

[83ford]

Ok so my fsuperduty is bein wierd as hell.runs great had great power and everthing.wierd thing is it's only runnin on like 6 or 7 injectors and 2 of the ones that are fireing arnt oiling.we can't figure that one out.and one of the known good injectors I swapped to a hole that wasn't firing and the one from that hole into the good hole.now the one that wasn't firing is and the one that was isn't.thought oh hey probley the wiring harness.changed it didn't make a difference.so then we changed the entire harness on the Motor still no change.were stumped


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[IDIoit]

first and foremost, these injectors need oil to fire.
thats how they fire.
could be a injector cup, could be blocked oil passages.
i would try to fire it up with that injector out.
if it makes a mess, you know you have oil..lol
wear safety glasses

 

[83ford]

It has oil goin to it just not coming out lol


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[IDIoit]

have you done a contribution test on it?

 

[83ford]

No one around here can do one and I can't use the torque pro app cause it's a 94.5.but we have unplugged them one by one and they all fired great other then the back drivers side one


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[79jasper]

Oh, I misread that at first because you said "f-super duty." Lol
Its just super duty for those.

Was the harness new? Used? What brand? Well the uvch, not the engine harness.

How do you know for sure they're getting oil?

I would try swapping the idm also.

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[IDIoit]

X2 on IDM,
if you did a contribution test, it would tell you if the IDM has a fault.

you could also let the computer tell you which cylinders arnt firing

Snap-on Solus FTW

 

[83ford]

Well I mean Id say if there firing there getting oil wouldn't you lol.but the harness was new oem ford and the engine harness was and old oem harness we pulled off another motor but it ran the same with the old harness


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[83ford]

I know which ones ain't firing well atleast on the drivers side.its the very far back hole.we haven't messed with the passenger side yet.now how would we do a contribution test


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[79jasper]

A scantool. Ie: AE, IDS, SOLUS, even some apps will do it.

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[83ford]

It's not got an obd2 port for the apps to work lol


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[79jasper]

I bet it does somewhere. Even the F550 still had it.

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[83ford]

This is a 94.5 fsuperduty

You must be registered for see images

obd2 wasn't till 96 i thought


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[79jasper]

Except Powerstrokes. Lol
Its under the dash behind the shifter. Aims straight down.

Depends if it's had the pcm flashed to OBDII. If it hasn't been, the apps won't work. Mine pretty much never saw the dealer, so it hasn't been flashed, yet.


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[83ford]

Oh alright I gotcha lol well I'll have to see what I can do then.ive got the torque pro app I just haven't bought the adapter yet cause I keep forgetting lol.the truck I needed it on we came to the conclusion it was the icp sensor and right now that don't matter because the rear end is messed up cause the yoke piles out about an inch and locks up.but I'll try and get that and see if it's obd2 or not.


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