wandering idle

[jesilvas]

This SHOULD be normal if I'm understanding you right.
See, the injectors are oil fired off of oil rails from the front of the block to the back that come off the HPOP. All four injectors on one bank are supplied with oil from ONE HPO rail. I don't know the firing order, but I do know that the #8 injector fires immediately after the #6 injector. Because of the rail setup and the firing sequence, the #8 injector doesn't necessarily have all the oil it needs to stay happy. So there's a bit of a bump in idle and a very slight (10-15 RPM or so difference. I had it hooked up to a dyno before, showed RPMs)
I have a high pressure hose connecting the two HPO rails. My idle is SUPER smooth and I don't feel the very rhythmic bump in the seat. That's what I think it is. But I'm no Ford Tech haha. I'd have to hear it to tell if it's normal or not.

[daveyburt]

maybe not a ford tech but, sounds like you understand how this 7.3 works
THANKS!!!

hmmm, i have a crossover line hanging in the basement

[jesilvas]

haha yea I know how some things work on it.
I AM thinking about being a diesel tech instead of a petroleum engineer.

I'd slap that thing on there. I loved it. My truck is a wimp at cold starting. It sat in 10 degree weather for a night and it loped SOOO bad cause the oil for the injectors took forever to get to that #8. Now it hadn't been that cold since I put on my HPO Xover but I can tell it's helped. My truck was even bad at about 40 and below starts lol. It's an amazing thing that hose.

Where'd you get that line at?

[daveyburt]

i got it a while ago, at itpdiesel:
KCM S.S. HPX Line (99-03)

[jesilvas]

Yep that's it. Not hard to install at all.

[n20]

daveyburt-

did you sove your problem?

[daveyburt]

nah, not yet.
other projects have been taking precedence.
AND, i've had a couple odd starts in the past few months and it did it again today: 7.3 odd start?

i'm hoping these two things are related and are bettered by a single fix.


BUT, i've been meaning to order a scan tool, maybe something will show up there...

i'm still on the case though and will post what i find.

[n20]

As for your 7.3 Odd Start post, if its like the video those are the romps, which are normal when its really cold, and can also happen if your glow plugs or Glow plug relay aren't working right. White smoke is a pretty sure sign of that. I had two dead plugs and a few were weak, and my GPR was intermidently working and it puffed white smoke and was rough up until around 50-60 degrees.

[daveyburt]

it didn't romp at all last winter and i get no real smoke currently when it is romping. -just a quick gray puff on a cold start.

i'll soon be getting the scan tool so, i'll run the glow plug tests to see but, i'm not convinced it's glow plug related. these GPs have less than 40k on them and i've read plenty of posts stating that glow plugs usually last a VERY long time, over 250k in some instances.

the other thing is it's totally intermittent and not dependent on outside temperature. It romped once when it was in the 60s outside (no glow needed). i've had plenty of cold starts in the past month with no romp. -and a couple with.

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Last edited by daveyburt : 11-04-2009 at 10:42 AM.

[n20]

so i pulled my ICP sensor today while it was idling and the tach seemed to steady out and stay put, no more up and down "hunting" i guess you could call it. So does this mean the ICP sensor is bad. There was no oil in the sensor which i heard that if that is the case they are definetly bad.