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Strange occurance of a DTC code 35

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ireburb

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The truck was running great until recently.

I have the dreaded Code 35 injection pulse too short but it only comes on during acceleration.

It started when the wife shut down the truck prematurely and I had to start on a little bit of cold veggie. I don't know if this is coincidence or the cause of the problem.

Funny thing is that it now runs fine once it switches to WVO. The code goes away completely and the truck has no issues on WVO. It also runs fine once I purge and run only diesel but only after I run WVO for a period of time.

I suspect there is some issue with the optical sensor from reading several posts so I have tried the following to diagnose or fix the issue:

Installed clear line and checked for any air bubbles-none present.
Ran Lubro Molly diesel purge through the IP via the lift pump (bypassed the fuel tank and ran from a coffee can).
Ran 1/2 tank of diesel with 2 stroke oil
Ran Powerservice
Filled the tank with fresh new diesel

I checked the pulse width with GMScan basic and when the code is present pulse width locks at either 1.95 or 1.99.

When the code is not present the pulse width changes based on pedal position.

Any help is greatly appreciated.
 
Its supposed to lock at 1.95ms pulse width values when you get the DTC 35. Why youre getting it is sometimes mysterious.

Have you checked your fuel filter lately?

Is your FSD an old one you relocated?
 
FSD is inside the truck on a heat sink. I ruled out FSD since there is no stalling and the code goes away when the truck turns over to WVO.

Since fuel pressure is 7 psi on diesel I also ruled out the fuel filter being dirty. Is there something else I need to check in regards to the fuel filter?
 
How is your LP and OPS? I am not sure how your LP setup with the WVO but that is another thing that is usually suspect. If you have separate LP for WVO.
 
The WVO goes through the same filter or more?

I dont know if mixing of WVO and diesel in the filter makes regular diesel cloudy or something inside your fuel tank is cloudy.

Can you trace the original occurences back to anything changed? What mods were done before it began?
 
I am running a two tank system. Two separate fuel filters and separate fuel pumps.
The only recent mod was to clean out my sock in the tank as well as the tiny screen in the fuel filter housing. While doing this I had to repair the fuel sending unit. I would think if that were the source that I would see some air bubbles in my clear line.
 
Not just bubbles cause this issue, cloudy fuel will, is the fuel clear? Take filter out and see if fuel in bowl is clear or if you have some junk, not saying its clogged, but is it dirty.

Separate fuel filters is supporting this even more now. What fuel station do you use? What type of fuel, #1, #2 ULSD, B20, B10?
 
If it runs well on the wvo and not the diesel and the filter for the diesel is good, it may be bad diesel fuel. Leo
 
Hopefully a near miss

I dropped the tank and ran a new fuel line to the lift pump today. Took it for a test drive and I have the same issue code 35.

I put it in neutral while coasting and the throttle took off to 4k rpm then plug that holds the engine block heater blew out and the coolant light came on about 1/2 mile from the house.

I made it to the driveway but hopefully didn't do too much damage to the engine.

I think the code 35 is from micro bubbles but I am not sure. I jumpered the lift pump and ran a temporary line to a clear water bottle and I can just barely see them if I hold the bottle up to the light. After replacing the entire fuel line from the tank to the lift pump I still have them:mad2:

I am calling it a night. Any more ideas that I can work on tomorrow?
 
Did you have the criuse set when you threw it in neutral or your foot on the pedal? If not should probably figure that one out.

When you dropped the tank did you find anything inside, was the fuel clear? What type of fuel are you using? Seafoam makes an actual fuel stabilizer/conditioner for diesels you might try that.

If there is no simple explanation for the high revving then that would support a bad PMD, which could cause that and the code 35. Is your PMD on a long harness and have a #9 resistor?

One member blew air through his fuel line from the LP to the filter assembly and got a whole bunch of crud out of it.
 
Just to update folks, I dumped some rotella in the tank and the code went away shortly after. After running 1/2 tank this way I filled up again last week and have no issues.

I post with an update later if something changes again. Thanks for the help.
 
ULSD is too "dry", and the IP suffer about that. That why the WVO does fine.

To restore lubricity in ULSD and run it trouble free, I pour 1/2 liter of 2 stroke marine oil (TCW-3 compliant).
Here in NC, we have solved several DTC 35 or 36 just with that tip.
 
And you had actually ran it with 2-stroke oil before and it didnt help, but the Rotella did?

Was the lubro molly originally added to fix this issue, because I think that can cause the issue itself, maybe youve finally washed all that out.
 
buddy said:
And you had actually ran it with 2-stroke oil before and it didnt help, but the Rotella did?

Was the lubro molly originally added to fix this issue, because I think that can cause the issue itself, maybe youve finally washed all that out.
Click to expand...

Lubro Molly was added to fix the issue.
 
I use to run 2 Stroke oil, seemed that the OS didn't like the dark blue/purple dye, Never coded, but she was a little rough and a fishbite once in a while......I was told to switch to SAE30 (no dye) and that made all the difference.

2 Cents
 
Brooklyn Tow said:
I use to run 2 Stroke oil, seemed that the OS didn't like the dark blue/purple dye, Never coded, but she was a little rough and a fishbite once in a while......I was told to switch to SAE30 (no dye) and that made all the difference.

2 Cents
Click to expand...

I never had a symptom of years running the WALMART special 2-stroke, I switched to SAE 30 Non Detergent for the lack of dye reason. Its also very cheap, always the cheapest one of all the oils.
 
I have a code 35 showing up hard (SES stays on) today. How much 2 stroke oil or SAE30per tank asre you guys running?
 
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