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Another DTC 35 thread

Missy Good Wench

Missy Good Wench

Wild Blonde from Cloud Mt
Messages
1,683
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65
Location
Newberg Oregon
Yesterday I headed off and got about 1/2 mile and Plop the 6.5 Burb dies.

Restarts and runs another mile and dies again this time setting the ses light.

Got it back home (Quickly)

Fooled around, pulled codes (35 showing)
Checked lift pump OK
Replaced the fuel filter, needed it anyway

No real indications other than the every present possibility of a PMD failure.

Took the rig out for a test drive later in the day and Plop, died at almost the exact same spot as before.


Plugged in an Old SOL D (PMD replacement) and the old girl purs like a kitten.

The PMD had failed on this rig shortly after we bought it (USED RIG)
Replaced the PMD with the then new on the Market Sol D

The first winter saw issues with the Sol D as it would not start below about 32 degrees without warming the Sol D with a hair drier. :eek:

Installed a remote cooler and 5 foot extension cable along with a used stanadyne PMD after that debacle.

Tossed the Sol D in the tool box and its been there ever since.

For now the Sol D will do the honors and I will install a fresh DTECH PMD before the weather turns nasty..


So to recap, a failing PMD can cause a DTC 35 to set along with stalling.

Many times the 35 will set and the rig wil run fine.
A 35 along with stalling is very likely a PMD as was mine.


MGW
 
The DTECH is accepted as the best replacement PMD/FSD? I'm a little outdated on this issue, last time I looked much into it there wasn't so many options..
 
The Sol D is no longer made and was I believe the first aftermarket unit that was marketed.

The company is no longer in business but they did make a mark on the industry.
The D TECH is the result of reverse engineering the Standyne units.

As soon as D Tech got with the program then Stanadyne decided to redesign the thing and they came up with their new unit. ??????????

Go figure

best

MGW
 
The PMD can surely cause a 35 since 35 is a pulse width error and the PMD is the unit responsible for providing that pulse to the Fuel Solenoid. I am not sure why so many people label the 35 and the IP going out (probably mechanics), but it has also gotten that reputation, when it could be any number of things affecting timing and fuel delivery.
 
GM even released a TSB regarding DTC and the PMD/FSD. I know at DP whenever somebody posted a 35 they always told people to replace the pump(I know I was told to for mine), I replaced the FSD though and it went 2 more years without much more trouble from the pump. A failing PMD with a 35 will also cause a real low weak idle around 350-400 in gear.
 
Generally the 35 will set if the engine is still rolling with throttle applied.
The ECM is expecting a proper return signal from the IP and it gets a crappy signal (Short pulse width) do to the fouled PMD so it sets the DTC 35.

If the engine is running slow and or at idle then the 35 will liley not set as the time required for things to register are simply not there long enough and the engine is stopped.

My rig started fine and ran good for a mile and then crapped out again but no code.

I replaced the PMD with another "Good Used one" and all is good again.
Gonna leave the Sol D bolted to the air hat though just in case.
Gotta get some more "good used ones"

A local diesel pump shop saves the ones that come off pumps that have things other than stalling issues (Optical sensor bad, stepper motor etc)
They save all the PMD's from those pumps and usually sell them for very inviting prices.

Usually $25 for a couple units.

The last one I got for 0$$ and it ran for over 2 years on the cooler inside the front skid pan under the radiator.

Sooner or later I'm gonna get a get a DTech for the rig.

MGW
 
Missy Good Wench said:
The Sol D is no longer made and was I believe the first aftermarket unit that was marketed.

The company is no longer in business but they did make a mark on the industry.
The D TECH is the result of reverse engineering the Standyne units.

As soon as D Tech got with the program then Stanadyne decided to redesign the thing and they came up with their new unit. ??????????

Go figure

best

MGW
Click to expand...

Thanks for giving me an update. Luckily my pmd hasn't been giving me issues so far (knock on wood)..
 
Aces

I would really love to do that swap out but, the $$$$ right now and I dont have everything that I need to do it sitting here on the shelf.

I hate the DS setup with a passion. Had far more than my share of roadside stops with PMD issues.


For now its a PMD down under on the cooler and the Sol D as a spare "Getcha home" up top.

With the cost involved all considered I will run what I have until push comes to shove.

When the IP takes the big Poop I will then have to decide what I am going to do.

But for now I will bitch and complain about the DS4

The DS is sweet WHEN its working right. The driveability is superb and outshines the mechanical system as far as being smooth with excelent tranny function.

The one and only failure is the Relaibility.

I would not take a DS fueled rig deep into the back country on a dieing bet.
I get nervous taking the rigs on a long road trip out of town.

Get very far away from home and its gonna be a real PITA if the rig quits and you can't fix it yourself along side the road.

Been 800 miles from home and had a rig go down. Had to use the chevy store shop.

OMG paid up the butt and the thing ran me just out of town and then quit again. Chevy shop closed by that time (Friday night)

Had to get the rig towed to a small shop in the next little burg and the fellow came in on Sat Morning and WE fixed it.

I told him what was wrong and his girl Friday drove out and got the parts and within an hour we were back on the road.

Chevy techs would not listen to me when I told them what was wrong "AAAARRRRRGG"

Tech at the small shop asked me what was wrong, he checked it out and agreed 100% and boom plop done.

I can only imagine the grief had that beed a DS pump issue.

Reliability is at the top of the list with me. I will trade off a lot of other things to get good reliability.

If it needs more than 2 wires to run it I dont want one.

The DB pump has one hot wire to turn the fuel on and one to control the cold advance.
(Not an absolute necessity)


MGW
 
In all fairness to the DS pumps.

The Mechanical portion of the unit is darned good.
Vey little trouble with the Pump itself. This issue is that the weak link is still the electronics.

Had GM and Stanadyne (Mostly GM) not been in such a hurry to get the thing to market the electronics would not have been such an achilles heel.

GM always does the hurry up and get it in the field thing and they always get the A$$ kicked hard with warranty issues and their reputation goes down the tube every time.

The truth is that GM had the 6.5 certified through the 94 model year with the DB2 pumps onboard.

Stanadyne cautioned GM that the DS was not yet ready to go and that it needed more work to get the reliability up where it needed to be.

BUT OHHHHHHHHH NOOOOOOOOOOOO gotta get the new "Drive by wire" on the market.

We all know the history of that debacle and it continues today as the needed R&D was never fully finished.

As soon as GM decided to scrap the 6.5 and move on then all refinements to the design stopped.

Now one new development is that Standadyne has picked up the torch and is now offering a new "Gray" PMD to compete with the DTech units.

I guess that the only motivation had to have been that as long as they could sell the same old junk all was well. Now let a new kid come along and make a better mousetrap and Holy $**T martha, we gotta do something.
So now we have a new PMD from Stanadyne.

I wont buy one simply because no help was forthcoming back when it should have been.

Even if GM did not want to do the job, Stanadyne should have thought enough of having their name on the POS to have come up with a fairly good solution to the problem.

They never once offered a remote cooler package or any other solutions.

Stanadyne could have made a tidy little profit with a cooler package and an extension cable.

Along with the cooler, the " now offered" new PMD would have been nice too.

The slap in the face to the consumer is the lack of or seeming lack of interest to fix the issue.

From 94 to present there have been campaigns and some updates to the DS series of pumps but overall the basic failure prone PMD has endured to this day.

Yes there have been some updates to the PMD but they still fail.

Hmmm they need a little gauge on them that shows when they are used up maybe. ???

Just one of the many things that we have had to endure along the road to getting good mileage in a big rig.

Best

MGW
 
I always thought since the remote FSD that the DS was just about as reliable as the DB pump.
Besides the actual internals of the pump going bad (which could happen to either) the only other problem would have to be accelerator pedal postion sensor, and those are not a known weak spot....not many fail, from what I read on the boards, many have replaced them to find they have wasted coin, their's were fine.

Am I correct?
 
I like the DS, because I like playing with electronics and reprogramming it. I have no reliability issues with it, I just drove 5000 miles in 2 weeks, 4 days of it was 1100 miles a day. I also drove it way into Yosemite, where there is no kind of service around and it takes a running vehicle 3 hours to get from the park entrance to the hiking spots. It is only been installed for a little over a year, because the one when I bought it crapped out after a couple months, and there were signs of it when I bought, that I now know. If you know a few simple rules to keep the DS happy they seem great, and maybe this is only after years of pain by others and upgraded internals, but today I think they are good.
 
OK we beat this in another thread, was just being a sh^t stirrer. All in good fun. Just wanted to wind Robyn up, mission accomplished...:D
 
As I have said
The DS is great when its working, Key Word is WHEN.

Some folks run the DS equipped rigs for a long time and never have an issue others, myself included have had many many failures.

With a DS pump, its not if its gonna give trouble, its WHEN.
It will happen, maybe not today or tomorrow, but it will happen.

Now that said, the new DTech PMD seems to be doing very well even when mounted in a poorly cooled place (stock location)

The IP itself if fed clean fuel generally will run a long time.

Some run 100K miles or more. Most DS pump issues are electronic and not part of the mechanical workings of the pump.

The life span on a DB2 can range from 100K to 250K depending on how clean the fuel has been.

I have seen a DB2 so tired that the truck would barely run, but it would make the rig go down the road.


My opinion of the DS is not likely to change much as I can remember the first Burb I got ran about half way home from the dealership (Day I picked the rig up after an 8 month wait for it) and the sucker died. had to have it towed back and wait another 3 weeks to get it back.

Ran 20K miles and quit, had it fixed, ran to 40K and quit, had it fixed, ran to 65K and quit. Got it fixed and then traded it off.

This was before we understood things and had the aftermarket goodies and remote mounts and Dtech pmds etc ect ect.



DB2 does not need a programer to make it work. Just screw the fuel screw down til the thing blows lots a smoke and turn the tubo master up till the pistons all melt and your set ):h ):h ):h

The fact that I still own these things says something though. Either I love them or I am a real glutton for punishment.


MGW :D
 
My ds4 has 100k and no fsd problems. Pump needs to be changed but fsd is still ticking and its still in the engine compartment not on the manifold but behind the drivers battery.
 
IMO ,outside of the PMD issue(a spare on board is as neccesary as a spare tire) the DS pumps fail mostly when running with a fuel supply problem for a while(low or no fuel pressure or crappy fuel or dirty filter)a Fuel pressure gauge will give a heads up in most of that situation.
 
bison said:
IMO ,outside of the PMD issue(a spare on board is as neccesary as a spare tire) the DS pumps fail mostly when running with a fuel supply problem for a while(low or no fuel pressure or crappy fuel or dirty filter)a Fuel pressure gauge will give a heads up in most of that situation.
Click to expand...

Probably the downside to the LP being flow on fail. Sometimes an easy driver can go for awhile without realizing the pump is not being supplied.
 
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