Injection Pump

[6.5 on da bayou]

Hello all haters of the stanadyne injection system,

I am about to replace the IP on my 95 Dually. This will be the 6th one installed on my truck but the first time I have to do it myself. GM paid for the first five. I have no idea what i'm getting into so any comments, experiences, advice, install instuctions, etc. will be EXTREMELY appreciated.

I'm getting dtc 35 and I have a 1 year old pmd w/ fsd heat sink, new lift pump, new ops, 5 psi fuel pressure when it stalls, new pmd harness, new accelerator pedal, and even some oil mixed with the diesel to help lube those internal solenoids.

Thanks in advance,
Frustrated Floyd!!!

[3bals]

I replaced my IP last Oct. I didn't think I'd be able to do it at first, but as I finished and looked back, it wasn't that bad. Walt's FAQs talk about tips on changing your IP. I also wrote email questions to him everytime I got stuck. The main thing is that there are some nuts and bolts that are hard to get at. Like Walt told me, be determined and keep working on it. Everything turned out fine, I didn't have any leaks and it runs fine now.

Jody

[John R]

I own a 1995 crew cab dually long box with 370,000 km on it which i just purchased recently.I have put about 2000 miles on since i bought it.The truck has now quit running on me.The truck was running well no problems at all. I talked with walt about my problems and is still a work in progress. His help is greatly appreciated! My recent work done is i replaced my pmd with a ( psd heat sink kit with #9 Resistor ) not from ssdeisel. A ( Injection Pump- 5521 ) from SSDiesel Supply. I have checked Fuel- Lift pump pressure (7psi ). I have a good supply of fuel to the Injector Pump. I opened my water drain off to check for water etc. The truck has a New Fuel Tank and Pump.I currently have my truck at a local (GMC Shop) they installed my Injector Pump and did all tech work with no codes! Except MY TRUCK WONT RUN they the dealer- shop tell me its the pump,they say (THE PUMP HAS NO OUT-PUT) I talked with walt and he assures me the pumps they sell are ( good ) So now im at a loss as what to do next ... is the pump infact good... is my new fsd good...computer? ialso checked the pink wire going to the fsd for power and its fine . IM STUCK! ANY ADVICE? OFF TOPIC HERE this is a kewl site (THANKS SO MUCH WALT FOR YOUR DEDICATION OF YOUR WORK AND BUSSNESS) glad to hear you are feeling better as well ! ( GOD BLESS! )

[smoken]

I also have a 1995 diesel extended cab 2500. I bought a new injector pump and a #9 resistor and a filter harness for the new pump. I got a fds cooler for the pdm when the last pump went up. that was 32000 miles ago. the truck ran for a couple of weeks. now it will not run. Walt told me that its the pdm because its throwing now codes. is your truck throwing codes. u can check for codes yourself. Walt explanes how to do it on ss diesel on the FAQ page. im going to buy another pdm and hope for the best. Also the pump might be off time, but the machanic should have the machine to time it back. Well good luck i let u know what happens.

[John R]

I took it to a local GMC dealer who installed my pump. The PSD unit i installed my self (a straight forward procedure to me). The GMC dealer installed the pump, they did a learn procedure, set base timing and set timing as to what he nomarmaly sets it to which his preferance is aprox. (neg. 1 deg.) with very minor adjustment from there. It differs he said from what GM specs are but he said this setting is were he has found to get the best overall performance! He also said that no codes were being displayed. I have talked to Walt about my problem and so far no luck yet with finding my nagging problem. He has asked me to check over some stuff and most off it I can do myself. But when it comes to setting the timing using a scanner I'm stuck because I don't own one, and the only way I can set it is by getting someone else to set it with a scanner which - now is supposed to have been done! because the (GMC Dealer) installed a NEW pump SS Diesel Supply! They did all the scanning to set up the pump (set base timing, learn procedure, did a scan with no codes generated). Now the shop is trying to tell me the pump is no good, because the pump its self has no output at all! I replaced the old PMD with a (new Heat Sink PSD kit), I have replaced my glow plugs, and they work fine, I have a new fuel tank and lift pump, I've checked the pink wire on the PSD, and it has 12 volts, I've checked fuel pressure - it is 7 lbs, which is fine. I've changed the fuel filter, the truck cranks over very well (new batteries). Walt has also told me to do a compression test - but I dont believe that to be a problem. My problem is I had a new pump installed, but I'm getting NO output at all from the pump! IF I had fuel to my injectors,(which in my case I don't) then I would consider the compression test to be of importance ... but first things first. I NEED fuel at the injectors, before I can think of it firing up or doing a compression test! What gives? - I'm not sure! - Is my computer done? - as in 'toast'?, because from my understanding of how this electronic stuff works is that; the electronic injection pump in itself can't do anything at all. The PSD or PMD(same thing), tells the injection pump what to do. However the computer in conjunction with the PSD/PMD controlls the injection pump as well as the electronic throttle control(gas pedal). Can somebody PLEASE!! help clear the fog?

[John R]

good news! and bad news! I think i may have figured out my problem! oh oh i forgot to remove my tester for taking codes , and i tried starting my truck ( how embarrissing ) i got to involved and flustered with my truck that in the middle of trouble shooting i forgot to remove my code tester before trying to start it. I haven't found out for sure but i'm afraid i may have fried my computer along with the possibility of the chip and possibly even my new psd ! Ouch that hurts ! I hope this may help someone else from making the same mistake!Maybe there are others that have done the same as well and there may be some that would never admit to it. I did however; do this before my new injection pump was installed by a local (Gmc) dealer. Which may explain also why i have no output from the injector pump! can anyone tell me if the tech 2 scanner can test to see if i fried my computer and or the chip? I have been told that the psd-pmd cannot be tested is this correct? if so why not? it doesn't make sense to me why not! please explain if it cant. My thoughts on testing the psd or pmd are that it has been made; and (made to work) therefore there must be a way to test it! the reliability of it cant be tested(it may not be reliable, but still work somewhat) Its just that so far I have not been able to find someone that knows how to test it.I know that there is more to it than that; because the unit may act up due to heat which causes it to fail at times or can even be speractic at times.In my case I would like know weather or not i can test the pmd- psd because of im not sure if i shorted it out when i forgot to remove my tester and tried starting my truck. Thanks for your input!

[farmboy56]

damn i love my db2

[christja]

damn i love my db2

What are you talking about? db2??

[Chevylover]

What are you talking about? db2??

DB2 = mechanical Injection Pump till 1993

Cu,
Sven

[6.5 on da bayou]

HEY SMOKEN,
What codes are you getting now?

HEY JOHN R
I'm not fully convinced that you "fried" your computer.Two years ago, one of my friends at the G.M. dealer was showing me how to retrieve the error codes on my dually and he forgot to pull the "DTC key" out and started my truck twice before he realized it and it didnt fry anything.

[smoken]

Hey John R
I have one old PDM u can use to test your truck to see if it runs. but heres the thing it will only let your truck run for a couple of minutes. this is how i found out my PDM was bad. your welcome to use it if you want. ill have another one that does the same thing in a couple of days. soon as the new one gets here. at least you will know if your computer is bad. let me know.

Hey 6.5 on da bayou
Im getting no codes when my truck shuts off. it just studers then shuts off. i checked for codes today.

[John R]

I verified that it is not fried after all. Had a scanner hooked and and it was able communicate with the computer! whew what a relief: Thanks anyways for your offer very kind of you smokin !

[John R]

The codes i read was a code 12 only; and thats normal

[John R]

all i get is a code 12 nothing else.

[smoken]

i dont know what a code 12 is. i want to say its the ops (oil pressure sender). well that good news your computer isnt fried. if you need anything else tell me. im looking at a wrecked chevy 6.5 van. the guy wants a couple hundred dollors for it. ill have a spare motor.

[smoken]

never mined thats right code 12 means their are no codes.:o brain fart. im at work, time to go home.

[John R]

i dont know what a code 12 is. i want to say its the ops (oil pressure sender). well that good news your computer isnt fried. if you need anything else tell me. im looking at a wrecked chevy 6.5 van. the guy wants a couple hundred dollors for it. ill have a spare motor. means no codes present.

[John R]

I also have a 1995 diesel extended cab 2500. I bought a new injector pump and a #9 resistor and a filter harness for the new pump. I got a fds cooler for the pdm when the last pump went up. that was 32000 miles ago. the truck ran for a couple of weeks. now it will not run. Walt told me that its the pdm because its throwing now codes. is your truck throwing codes. u can check for codes yourself. Walt explanes how to do it on ss diesel on the FAQ page. im going to buy another pdm and hope for the best. Also the pump might be off time, but the machanic should have the machine to time it back. Well good luck i let u know what happens. At last I have found my cure! My Crank position sensor was shot so i replaced it runs fine now! though it seems odd that i never received any codes saying that it wasnt working or that it was faultly. One of the wires on the crank sensor was broken right off .No wonder it the Injection Pump wasnt giving off any fuel at all. It all makes sense now. the crank sensor wasnt working,so that in turn wasnt telling the computer that the engine was turning over therefore the Injection Pump wasnt getting a signal to turn on from the computer After replacing the crank sensor the computer now recognized that the motor was being started so the computer in turn gave the signal to turn the Injection Pump on.

[smoken]

that is great. i havent got my truck running yet. im still waiting on the pmd. but now im starting to think if that is the problem. did your truck start at all then stut off. thats what my truck is doing. hope the pmd is it.

[John R]

that is great. i havent got my truck running yet. im still waiting on the pmd. but now im starting to think if that is the problem. did your truck start at all then stut off. thats what my truck is doing. hope the pmd is it. yes thats how it was in my case. first it ran fine! then it started to sputter a bit and then it stalled.i started it up again it sputtered and smoked somethin fierce! as i stepped on it . then it ran fine again. you can read my other posts o hear to find out more. but the end result was it was my crank sensor that was shot! I found this to be the problem after i stuck a pile of money into my truck! oh well at least those parts should be good for a while now. I hope!
:D hey if you got any ? please feel free to ask! anything for a fellow 6.5 er

[smoken]

well i got my PDM and my intake. the truck is alive, and the intake makes the turbo sound great. the real test is yet to come. wednesday i have to tow a 25' gready white to north carilona.
John R thanks for the info, same with u, also i bought another 6.5 out of a wrecked van. the van was a 2000 so i got parts. im going to buy the tranny too if it the same as mine.

[RAYMONDK]

I've not done it yet but the only sure fire way to check the electronic part of the pump is with an oscilloscope on the fuel control solenoid. There should be a characteristic pulse pattern to the solenoid from the PMD which should be almost identical for all normal engines. You may even be able to use a dwell tester or an analog volt meter. I can't believe this hasn't been done yet with all the problems they've had with the fuel system. I just installed my third PMD this time on an SS heat sink. The others were on GM warranty which just ran out. When I get time to fix my scope I'll check it, but whens are sometimes a long time.

[John R]

Hey Smokin no problem! Im glad to hear you got your problem resolved and you finally got to hear your truck running . Kewl !

[smoken]

John R
I think my #9 resistor just kicked in how long does it take again. When i towed that boat the truck was a little slugish and could not keep a constint speed when going over overpasses. I got to tow again in a couple of days, hopefully the resistor kicked in by now. The next tow should pay for the marine injectors. Maybe the truck will not be slugish then. Can't remember do you have marine injectors.

Also who has marine injectors did it improve your towing yes/no.

[TAZZ9963]

Hi John,

The #9 resistor kicks in after 50 starts, computer does a re-learn every 50 starts so you could have put the resistor in between that. An easy to make sure it kicks in right away is to disconnect the batteries for a couple of hours and it will re-learn on the first start. Thats how I did mine and it worked great.

Dan

[Steve4]

I have the marine injectors in both of my trucks. I don't know how much difference it will make without the "Air Intake" and "4" Exhaust", but it sure made a difference for me. I tow a 30' boat on a tri-axle trailer and I saw a difference with the injectors. From what I understand, they allow more fuel in and in a different spray pattern. You know the theory, more air in - more fuel in - more air out. If the truck can breathe adding fuel won't hurt and could even increase you fuel mileage!

[Rapper63]

At last I have found my cure! My Crank position sensor was shot so i replaced it runs fine now! though it seems odd that i never received any codes saying that it wasnt working or that it was faultly. One of the wires on the crank sensor was broken right off .No wonder it the Injection Pump wasnt giving off any fuel at all. It all makes sense now. the crank sensor wasnt working,so that in turn wasnt telling the computer that the engine was turning over therefore the Injection Pump wasnt getting a signal to turn on from the computer After replacing the crank sensor the computer now recognized that the motor was being started so the computer in turn gave the signal to turn the Injection Pump on.
Too bad the GM mechanics couldn't come up with that solution, makes you wonder huh?

[montana bob]

Hi guys

I just replaced my IP and was also not getting any output from the IP.
Walt has been helping me alot with the trouble shooting THANKS Walt.

What Walt had me do was to was to remove the plug for the optical sensor and try to put it into limp mode and it fired right up!! then I plugged it back in and it started again, but when I drive it now there is a loud whine when it hits about 2000 RPM! When it is parked and the wife brings up the RPM I can tell it is NOT comming from the turbo. Does any one have any ideas?

[grancito]

Use a piece of hose, one end to your ear to locate the noise, perhaps alternator, stearing pump or belt tensioner.

[montana bob]

Well I did use a long screw driver checked all the above even the new IP just cant find it.

If I had to discribe it I would say it sounds like a super charger on a dragster

[grancito]

Tube is better, you don't need to make contact with where the noise is coming from.