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Old 11-13-2005, 10:38 PM   #13 (permalink)
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From the problems you describe, timing can be affected by a bad Overflow Valve.

The low pressure release of the overflow valve due to normal wear will slowly degrade and in essence retard the timing of the injection sequence due to a lower inlet pressure to the injector pump. This late timing will cause studdering, and misfire when cold. Also mileage may be an indicator.

replaceing the overflow valve would clear up alot of the problems. Before you pay for a timing adjustment I would definitely go and spend the $75 on an overflow valve and see if it changes anything.. I would bet it would make a significant difference.


Cheers, Kevin
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Old 11-13-2005, 10:40 PM   #14 (permalink)
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you also need to check your afc housing out

and you need to make sure the fuel plate is not missing .... look for the tamper proof screw to be missing that will prove tampering in the pump ...

heres some learning material

http://www.dodgedieseldatabase.com/p...ction_pump.htm

http://www.dodgedieseldatabase.com/p-pump_cut_away.htm

http://www.dodgedieseldatabase.com/12_v.h4.gif

http://www.dodgedieseldatabase.com/t...up_a_p7100.htm

keep us posted

DM
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Old 11-13-2005, 10:43 PM   #15 (permalink)
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here's where the brake off (tamper proof Screw is ..



Is it intact

DM
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Old 11-13-2005, 11:00 PM   #16 (permalink)
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The overflow valve would be key suspect to me, I have read of folks with symptoms like you describe and one thing fer sure it doesnt hurt to renew it once in a while, get that truck goin again and its off to the races [IMG][/IMG]
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Old 11-13-2005, 11:01 PM   #17 (permalink)
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Quote:
Originally Posted by Whitmore
From the problems you describe, timing can be affected by a bad Overflow Valve.

The low pressure release of the overflow valve due to normal wear will slowly degrade and in essence retard the timing of the injection sequence due to a lower inlet pressure to the injector pump. This late timing will cause studdering, and misfire when cold. Also mileage may be an indicator.

replaceing the overflow valve would clear up alot of the problems. Before you pay for a timing adjustment I would definitely go and spend the $75 on an overflow valve and see if it changes anything.. I would bet it would make a significant difference.


Cheers, Kevin
Where is the overflow valve at?
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1989 C3500 reg cab flatbed, 6.2, GM4 turbo, Was TH400, process of installing NV4500.
I LOVE the CTD...I just dont like the shipping container it comes in.
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Old 11-13-2005, 11:04 PM   #18 (permalink)
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I would say you have a slight Fuel Delivery Issue

First thing to do is start cracking injectores just 2 people

have the driver hold it where its missing real bad

then pop the hood and remove the first injector line at the pump it will squart diesel all over ,,,when the line is cracked on the fist one ,,,,does it sound better ?????? if not keep going if you find oine that straited it up then that injector is bad ...if none of them straiten up how its running then the prople is in the pump we will move on .................

After ruling the easy stuff out ....we go deeper like timing adjustment if we have to

good luck I hope its an easy fix for you

Your looking to see if its been messed with if the tamper proof screw is present then dont mess with it ....till later :>

If its gone then we'll go from there

DM
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Old 11-13-2005, 11:06 PM   #19 (permalink)
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DM
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Old 11-13-2005, 11:07 PM   #20 (permalink)
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Quote:
Originally Posted by AZBLACKSMOKE
Where is the overflow valve at?
Right on the pump where the return line comes back in , here is a link to more info on it overflow valve


I do agree that it is common for the timing to slip but the symptoms they listed there can overlap with other things as well.

The OF valve is probably the single item the wears out most often on a 12 valve.
Precision Diesel Injection and Turbo Inc.
Marty Tompkins
888-734-7349
$35 + $5 shipping and handling.
Replacement takes one wrench and five minutes.

If you don't have a gauge symptoms are:
low RPM miss/instability
white smoke
hard starting
engine dies at idle
low power
fuel filter cracking
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Old 11-13-2005, 11:09 PM   #21 (permalink)
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Boy I tell ya that DM has a quick puter and fingers that know how to run it
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Old 11-13-2005, 11:10 PM   #22 (permalink)
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Quote:
Originally Posted by
WATCH THIS VIDEO .....

http://www.dodgedieseldatabase.com/12vv.zip

IS IT DOING THAT ??? Or something similar ?

DM
Sorry for the slow replys..my computer is acting up.

My situation is very similiar to the video. It sounds the same except mine is doing it at 2000rpm, and the the truck in the vid. looks like it was doing it at 1100rpm.
Slightly different rpm's, but they sound the same. Excellent video.

What do I look for when I have the afc housing off? Cracks, crap? besides making sure it hasnt been tampered with. i will look closely at the links/info you gave me and keep ya'll posted. thanks.
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2001 GMC 2500HD, crewcab,LB, 4x4, duramax, ZF6, Southbend SD, organic, hypertech.
1989 C3500 reg cab flatbed, 6.2, GM4 turbo, Was TH400, process of installing NV4500.
I LOVE the CTD...I just dont like the shipping container it comes in.
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Old 11-13-2005, 11:15 PM   #23 (permalink)
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Quote:
Originally Posted by
I would say you have a slight Fuel Delivery Issue

First thing to do is start cracking injectores just 2 people

have the driver hold it where its missing real bad

then pop the hood and remove the first injector line at the pump it will squart diesel all over ,,,when the line is cracked on the fist one ,,,,does it sound better ?????? if not keep going if you find oine that straited it up then that injector is bad ...if none of them straiten up how its running then the prople is in the pump we will move on .................

After ruling the easy stuff out ....we go deeper like timing adjustment if we have to

good luck I hope its an easy fix for you

Your looking to see if its been messed with if the tamper proof screw is present then dont mess with it ....till later :>

If its gone then we'll go from there

DM
I'll try that tomarrow. Thanks.
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2001 GMC 2500HD, crewcab,LB, 4x4, duramax, ZF6, Southbend SD, organic, hypertech.
1989 C3500 reg cab flatbed, 6.2, GM4 turbo, Was TH400, process of installing NV4500.
I LOVE the CTD...I just dont like the shipping container it comes in.
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Old 11-13-2005, 11:18 PM   #24 (permalink)
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Didnt you post this once already

Look on page 2 for the reply >..LOL

Thanks Whity by god we'll get his truck back on the road or our mother boards will fry

The truck in the video was attemped to be fixed by ...

Over flow valve

Delivery Valves

Pre filter cleaning

and a few more things ...what fixed it was

Smaller injectors and 3kgsk and afc work

this is a 160 pump truck that had 370's in it we thought the 370's were bad so we bought a new set of 370's ..it didnt fix it ..

we went to stock injectors and it fixed it 75%

the 3kgsk took care of the rest ...

you truck is a diffrent animal tho ,,,the reason the truck in the video was struggling was that the pump was to small to run the injectors without other other mods being done ..

you pump is big enough so there has to be something else wrong but with simalar symtoms.

So Check the injectors

check for the tamper proof screw

and swap in your CTD neigbors Over flow valve

then go from there


DM
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