The issues that I am having is that the #8 injector keeps failing the 'contribution test' from the Modis Scanner. I had made certain by testing several times that it would be worth pulling the injector. When I did I found that the o-rings were starting to get dry just a little and that one of them had a mark where it looked as though it may have been passing fluid by. ( I can not remember which one that was right now) The injector itself had some carbon build up on the tip and a light general tarich on the outside of it.
I wiped the injector clean with brake cleaner and a rag. I did not soak it it or spray into the injector. Installed new o-rings and reinstalled into the motor.

The first test came back fine. I have since tested over the last few days and it is being intermittent. But more often as not contributing.

The only other thing that is going on with the truck is that I do seem to have a slow oil leak coming from up near the HPOP. Iam finding a small puddle of oil in the valley. Have not had time to remove the pump and inspect. But I can confirm that it is not the plug on the lower right.

I would think that if the injector problem was oil related, such as getting air in somehow that it would not keep showing on only the #8 injector. I would have the same thought if this was a fuel delivery issue also.

The truck has 102,000 miles on it I bought it used with 75,000. I replaced the HPOP it had a leak on the 'unservicable o-ring' about 10,000 ago. Did not check with a computer at that time. The truck runs fine, no noticable miss. good power.

I run usually Exxon fuel in the truck along with some additive about every other tank.

My mechanic bud had mentioned that maybe we might want to bump up on the injector size if I was going to buy injectors. I think he was thinking that way because another friend has a 96 and had gone up in size. But I think that truck came with small injectors in the first place.

I think I will just replace the one injector and change the o-rings and glow plugs on the rest. Unless anyone has any great ideas.

 

Have you buzzed the injector #8? I'm wondering if you have a UVC harness issue or injector harness problem that is causing the #8 to only intermittenly work. At 100K miles, an injector failure is not that common, but a wiring issue is very common.

 

Yes I should have added that we have done the buzz test with the scanner. All passed.

But it is worth doing it again since I have not doing that after the o-rings.

I'll take a good look at the harness too.

 

Was that injector a LL?

 

An LL? I do not know. It was what was in the truck. I assume it is stock.

 

Can you cahnge just the #8 injector to the AD type with out changing all the others to AD?

 

The other injectors are an AD injector. The #8 hole is a LL (long lead) AD. Yes you can swap out that one, but at the same time get a regulated return fuel system from ITP and delete the dead headed fuel rail...

 

Ok. I do not mind having to buy an injector but...What will happen if I do not get a regulated return system?

I looked at it and it is a great looking system but..... not cheap..and it should not be necessary for the engine to operate in stock fashion.

 

Have you tried swapping the solenoid from that injector to the one next to it. i had a similar problem with #3 not contributing. Turned out to be the solenoid. Weird but true.

 

You'll get a lot of injector knock unless you get rid of the air in the fuel.
You don't necessarily have to spend the $500.00 for the regulated return.
A Hutch mod works 90% as good IMO.
I have all eight AD injectors and there is a little knock at idle but the rest of the time it runs great.

 

Thats the way the fuel system should have been from the factory... In fact it is in any international trucks... Ford got cheap and deleted it.

Yes it will run fine without it. I dont have one and have some big injectors... In will knock at idle but should run fine if you do the intank and pre pump mods (very cheap!).

 

hmmm....

do you have a link to the Hutch mod?

So.. if there is air now then I should have a knock.. which I so not seem to detect...

also if there is air in the system why does it only show on #8 why not on #7 or another injector?

 

I'll do you one better.

https://www.ford-trucks.com/forums/2...el-supply.html

https://www.ford-trucks.com/forums/4...-the-tank.html

And pictures of HutchinAugusta's Webshot album whom the "Hutch" mod is named after. Be sure and look at all three pages.

http://rides.webshots.com/album/32614313yLKyrS?start=0

 

That is why Ford added the LL-AD injector to the #8 hole... Is because of complants of idle knock in the superduty pickups when they came out. The #8 is the only one at the end of the fuel rail. That is why some do the regulated return, then the air goes back to the tank and not thru the injector.

Look on this page about half way down for the intank mods and pre pump mods

http://www.dieselinnovations.com/di....products&cat=2

 

Just look at the p/n. on the top of the injector . It will end in LL. I got one on my 99 and it been working good now for 5 years.