engine or injector knock
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
Read this:
https://www.ford-trucks.com/forums/2...el-supply.html
.
https://www.ford-trucks.com/forums/4...ml#post3235164
.
And this, it's the best solution IMHO, but you have to have the facilities to be able to do it.
https://www.ford-trucks.com/forums/4...-the-tank.html
https://www.ford-trucks.com/forums/2...el-supply.html
.
https://www.ford-trucks.com/forums/4...ml#post3235164
.
And this, it's the best solution IMHO, but you have to have the facilities to be able to do it.
https://www.ford-trucks.com/forums/4...-the-tank.html
New User
Joined: Aug 2006
Posts: 9
Likes: 0
Got the knock pegged. Apparently it's common enough that ford put out a paper on it. It's the injector on #8 clyinder. There is a special replacement injector made that is specific for that problem, and designed to fit in #8 hole only. I haven't got all the technical jargon on it yet, as I haven't been able to get up to the shop and get the truck, but will post some of it in the next few days. It (the knock) doesn't hurt the engine, according to the paper.
farmhand@telus.net
farmhand@telus.net
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
that is the long lead injector they put in #8 in some trucks to reduce the knock cant remember the exact years but check here far a chart on the LL applications (scroll to the bottom
http://www.xtremediesel.com/index.as...ROD&ProdID=206
http://www.xtremediesel.com/index.as...ROD&ProdID=206
New User
Joined: Oct 2005
Posts: 19
Likes: 0
Ford did the cackle fix,replacing AD injector with the LL8.It didn't help except to create a different noise. I replaced the LL8 with the AD injector,did a regulated fuel return mod and all the other fuel line and tank mods.I took the truck to a reputable diesel shop and had an analyzer check done. One of the injector is not performing properly which is creating the knock and a slight miss. They told me not to do anything at this time. It will eventually get worse and then it will have to be replaced.
The performance is good and the mileage is good.It starts good,cold or hot and the idle is good.So at this time,it's not broken,so I will not fix it, just put up with the knock.
The performance is good and the mileage is good.It starts good,cold or hot and the idle is good.So at this time,it's not broken,so I will not fix it, just put up with the knock.
Senior User
Joined: Sep 2005
Posts: 170
Likes: 0
2k
what kinda test did the shop run to tell you this? I need to know so i can see who around me has a computer to run that test.
Also:
Is your knock at idle or driving down the road? Mine will knock once I level out on a speed (what ever the speed limit is)
thanks
HIggins
what kinda test did the shop run to tell you this? I need to know so i can see who around me has a computer to run that test.
Also:
Is your knock at idle or driving down the road? Mine will knock once I level out on a speed (what ever the speed limit is)
thanks
HIggins
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Postmaster
Joined: Aug 2004
Posts: 3,948
Likes: 2
From: SHELTON, WA
hmmm
well it sounds like they did a cylinder contribution test. and one of them is not up to par. IN OTHER WORDS YOUR RUNNING ON 7 CYLINDERS
why they told you that is beyond me.
higgins
where do you live? a lot of us have the software to do it. just all depends if someone lives close to you or not??????
well it sounds like they did a cylinder contribution test. and one of them is not up to par. IN OTHER WORDS YOUR RUNNING ON 7 CYLINDERS
why they told you that is beyond me.
higgins
where do you live? a lot of us have the software to do it. just all depends if someone lives close to you or not??????
Senior User
Joined: Sep 2005
Posts: 170
Likes: 0
99,
So what exactly will a cylinder controbution test tell me. how is it different than a buzz test
I live in Western NC. The auto shop at the school i teach at has some scanner that i know can do a buzz test but i'll have to ask about a controbution test
thanks
Higgins
So what exactly will a cylinder controbution test tell me. how is it different than a buzz test
I live in Western NC. The auto shop at the school i teach at has some scanner that i know can do a buzz test but i'll have to ask about a controbution test
thanks
Higgins
New User
Joined: Oct 2005
Posts: 19
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The test they did just showed that there was one injector that was not up to par,did not show which one.
Do you mean that if I change out the weak injector my mileage will increase? It runs good now,and mileage is good,I am always for better!
I am near Anaconda,MT. Not too much around here.
Do you mean that if I change out the weak injector my mileage will increase? It runs good now,and mileage is good,I am always for better!
I am near Anaconda,MT. Not too much around here.
New User
Joined: Oct 2005
Posts: 19
Likes: 0
Where can I get the CCT or BUZZ(?) test performed and the approx. cost? Do you recommend F--D? IYO,should I replace the problem injector? Will it harm the engine if I don't? It 's noisy mostly at idle.
Thanks for your continued interest.
Best and cheapest place to get a replacement injector?
Thanks for your continued interest.
Best and cheapest place to get a replacement injector?
Last edited by 2kstroker; Aug 27, 2006 at 04:38 PM.
Postmaster
Joined: Aug 2004
Posts: 3,948
Likes: 2
From: SHELTON, WA
Originally Posted by 2kstroker
Where can I get the CCT or BUZZ(?) test performed and the approx. cost? Do you recommend F--D? IYO,should I replace the problem injector? Will it harm the engine if I don't? It 's noisy mostly at idle.
Thanks for your continued interest.
Best and cheapest place to get a replacement injector?
Thanks for your continued interest.
Best and cheapest place to get a replacement injector?
thats almost a 1/3 of the price of a scan tool.
cookie posted a link to some pretty cheap injectors a few days ago. you could always have an injector shop repair what you got.