Running real rough and cant idle unless SES in on then it fine.

[NVW]

just to eliminate a thing or 2
did you check for air in the fuel system?
Do you still have the OS filter in there,did you try running it without.


your timing is way out,and boost seems rather high for fast idle no load.
Timing chain ever replaced? How many mls on it?
How many mls on the IP?

IMO,You could have a broke IP shaft

The boost is barometric (MAP), so it's approx. 0.

Try running 2-stroke oil or non det. 30 wt oil in your fuel, at about 1%.

You said it ran smooth with the OS unplugged so it most likely isn't your IP armature, but try slowly revving it to 2000 rpm and holding it there, then slowly bring it down. If you can do that the armature is OK.

 

[JiFaire]

Hey Dog... give this a read.

http://www.mamut.net/royh/newsdet9.htm

Roy Halvorsen (Norway) did a nice little pictorial how-to for changing the optical sensor.

Before you try that, though, Your OS filter harness may also be bad... you can pull it and hool the harness back together to test - the truck will run without it, but if this solves your problem, you should get another one. OBD-II trucks can do without them because the PCM is equipped to filter stray transients - your OBD-I isn't.

Jim

 

[Dive-N-Dog]

The boost is barometric (MAP), so it's approx. 0.

Try running 2-stroke oil or non det. 30 wt oil in your fuel, at about 1%.

You said it ran smooth with the OS unplugged so it most likely isn't your IP armature, but try slowly revving it to 2000 rpm and holding it there, then slowly bring it down. If you can do that the armature is OK.

I geuss that I am a little dumb here but why should I mix 2 stroke oil with my fuel and will that be somthing that I will need to do all the time?

Thanks
-Dog

 

[Dive-N-Dog]

Hey Dog... give this a read.

http://www.mamut.net/royh/newsdet9.htm

Roy Halvorsen (Norway) did a nice little pictorial how-to for changing the optical sensor.

Before you try that, though, Your OS filter harness may also be bad... you can pull it and hool the harness back together to test - the truck will run without it, but if this solves your problem, you should get another one. OBD-II trucks can do without them because the PCM is equipped to filter stray transients - your OBD-I isn't.

Jim

Thanks Jim as a matter of fact I saw where you posted it in a previous thread. he did a great job:thumbsup:

Thanks
Aaron

 

[JiFaire]

I geuss that I am a little dumb here but why should I mix 2 stroke oil with my fuel and will that be somthing that I will need to do all the time?

Thanks
-Dog

Well, Aaron, I had those codes once and I ran a few tanks through with 8oz Powerservice Silver mixed with 16 oz 2-stroke and 20 gallons diesel... and the codes went away.

After that, I settled down to putting in a qt of ND 30-wt oil in each tank - the cheapest non-detergent stuff I could find. They never came back...

The new ULSD just doesn't have enough lubrication in it for your DS4 IP.

 

[Dive-N-Dog]

OS or the whole IP?

I did a fair amount of searching to day and managed to get an email off to SSDiesel Supply I had asked where in California I could get a OS for a good price. The following was his responce.

Hi,

The optical sensor is NOT something you can replace in the field. It requires the pump to be calibrated on a pump dyno off the vehicle.
Replacing just the optical sensor and re-calibrating is about 85% the cost of one of our complete remans. And if you replace it, you are left with the rest of your pump old and tired. It just makes no sense to ever do. When the optical sensor goes, its time to replace the pump.

*** Due to the large volume of e-mail we receive, PLEASE include previous e-mails when responding. This will allow us to read the complete dialogue in one message and will result in quicker responses. Thanks! ***


Thanks,

Walt
SSDiesel Supply LLC

Now I know that he is in the biz to sell IP's so I guess that I need to take that with a grian of salt. My way of thinking is if Walt says you need to change the OS you should change the IP because it's old and tired. Then what? if I change the IP should I just reeplace the intire 6.5 cause it might be old and tired?

What do alll of you think?

Thanks
-Dog

 

[Dive-N-Dog]

Well, Aaron, I had those codes once and I ran a few tanks through with 8oz Powerservice Silver mixed with 16 oz 2-stroke and 20 gallons diesel... and the codes went away.

After that, I settled down to putting in a qt of ND 30-wt oil in each tank - the cheapest non-detergent stuff I could find. They never came back...

The new ULSD just doesn't have enough lubrication in it for your DS4 IP.

Hey thanks it can' urt to try... Beats the cost of a new OS or IP.

Thanks
-Dog

 

[JiFaire]

Hey, it's cheap, and it can't hurt anything. Try pulling the OS filter off, too... it is an in-line filter from the OS back to the PCM harness. Checking that out is free,and a new filter (if that's the problem) is only like $70.

Somebody here changed out their OS for like $160... but i can't remember who it was. They said it wasn't hard to do. I think ol' Walt is trying to sell you a new IP.

 

[NVW]

I did a fair amount of searching to day and managed to get an email off to SSDiesel Supply I had asked where in California I could get a OS for a good price. The following was his responce.

Hi,

The optical sensor is NOT something you can replace in the field. It requires the pump to be calibrated on a pump dyno off the vehicle.
Replacing just the optical sensor and re-calibrating is about 85% the cost of one of our complete remans. And if you replace it, you are left with the rest of your pump old and tired. It just makes no sense to ever do. When the optical sensor goes, its time to replace the pump.

*** Due to the large volume of e-mail we receive, PLEASE include previous e-mails when responding. This will allow us to read the complete dialogue in one message and will result in quicker responses. Thanks! ***


Thanks,

Walt
SSDiesel Supply LLC

Now I know that he is in the biz to sell IP's so I guess that I need to take that with a grian of salt. My way of thinking is if Walt says you need to change the OS you should change the IP because it's old and tired. Then what? if I change the IP should I just reeplace the intire 6.5 cause it might be old and tired?

What do alll of you think?

Thanks
-Dog

Yes and no, to replace it in the field one should have access to a scanner so idle fuel rate can be adjusted. Walt is in the business of sales.

 

[Dive-N-Dog]

Yes and no, to replace it in the field one should have access to a scanner so idle fuel rate can be adjusted. Walt is in the business of sales.

I have GMTDScan basic will this work or will I need to upgrade to GMTDScan tech version?

Thanks Again
-Dog

 

[NVW]

I think I noticed in your screen shots that it displayed your idle fuel rate, so you should be able to fine tune the OS.

 

[Dive-N-Dog]

Well, Aaron, I had those codes once and I ran a few tanks through with 8oz Powerservice Silver mixed with 16 oz 2-stroke and 20 gallons diesel... and the codes went away.

After that, I settled down to putting in a qt of ND 30-wt oil in each tank - the cheapest non-detergent stuff I could find. They never came back...

The new ULSD just doesn't have enough lubrication in it for your DS4 IP.

Jim,
How long did it take when you preformed the above to have any affect?

Thanks
-Dog

 

[JiFaire]

My codes went away after about 1/2 a tank, but my engine wasn't running rough like yours is... it ran worse when the SES light was on.

I think there is more to your issue than just the codes.

When your light comes on, your timing changes (your system defaults to 'limp mode') and things go back to baseline settings... that it runs better with the light on makes me think your timing is off when it ISN'T coding - which begs the question 'WHY?'.

I'm thinking bad OS. Have you tried taking off the OS filter yet?

 

[Dive-N-Dog]

My codes went away after about 1/2 a tank, but my engine wasn't running rough like yours is... it ran worse when the SES light was on.

I think there is more to your issue than just the codes.

When your light comes on, your timing changes (your system defaults to 'limp mode') and things go back to baseline settings... that it runs better with the light on makes me think your timing is off when it ISN'T coding - which begs the question 'WHY?'.

I'm thinking bad OS. Have you tried taking off the OS filter yet?

Thanks for that. So far I have only managed to get through a 1/10 of a tank and oddly enough the fuel gauge is now accurate again that damn thing has not been right for years it was always way past F when full. I mean by about a 1/2 inch too far right. And now…it’s dead nuts on:thumbsup:

I can't say that the rough running at low RPM is gone yet but I have my finger crossed.

Thanks again.

-Dog