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GMTD scan tech

Thanks guys I have the injectors out. Now I need to figure out if they are Chinese. I bought them over a year ago I do remember them being in a blue and red AC box. Is there anyway to tell by looking at them? If there I’ll post pictures.
 
iirc the only way is to pop them apart and see if the nozzles are of what manufacture, but I also wouldn't recommend pulling them apart without a clean room. I would talk to Marty's guy and send them over to him having him fix them up for you. this will eliminate this as the issue.
 
dbrannon79 said:
iirc the only way is to pop them apart and see if the nozzles are of what manufacture, but I also wouldn't recommend pulling them apart without a clean room. I would talk to Marty's guy and send them over to him having him fix them up for you. this will eliminate this as the issue.
Click to expand...
And that I think is the best option unless @Rockabillyrat Would be willing to take on such a project.
I have nit seen him in the forum for a while, unless I am just missing his presence.
 
Ok guys bear with me I am on Medicare. The injectors are Bosch not AC Delco. I don’t know where I got the blue and red AC Delco box thing. Some of the injectors had yellow dots on them. Doesn’t that usually mean that they were tested. MrMarty51 you said you had Bosch injectors from India that were new. How do you know if they were new? If these are new maybe I should have them tested and balanced but I am a little worried because you had trouble w/ yours. If they’re rebuilt maybe I shouldn’t.
I’m like you and don’t want to take any chances w/ this new motor. I went online and looked for real AC Delco injectors and was overwhelmed trying to find which ones were real AC Delco. Gmparts.com say they have GM original parts. And ACDelco is aftermarket backed by GM. Can only get AC Delco from them
$127. Each. What do you guys think?
IMG_0276.jpegIMG_0278.jpeg
 
I can pop them for you if you want to test them. I have everything to test and rebuild injectors.

MrMarty51 said:
And that I think is the best option unless @Rockabillyrat Would be willing to take on such a project.
I have nit seen him in the forum for a while, unless I am just missing his presence.
Click to expand...
Im still here, just been really busy this summer.
 
ak diesel driver said:
@Rockabillyrat what are you using for nozzles now? Seems all the common sources are crap anymore
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Stanadyne makes nozzles for our injectors. Other that Bosch that the best replacement I've found. Delfi also makes nozzles, but I don't feel as confident in theirs. At least with Stanadyne I know they specialize in diesel fuel systems. Last time I looked they were around $50 a nozzle. But I've been too busy to keep up with the current market. I'm going to get back at it this winter, Hopefully my new shop will be ready next year and i can start putting more time into this stuff for you guys.
 
Hi guys, I just got off the phone with Joe w/Pro Tech Diesel. MrMarty51 recommended them to check out my injectors. He said there was nothing wrong w/them and should not cause the problem w/missing and black smoke on start up. I guess I’ll do a compression check to rule out compression problems because I keep getting cylinder balance codes. If compression is OK and still get cylinder balance codes maybe the timing is still off and needs to be revisited. It is a reman IP from Quadstar with no IP codes unless cylinder balance codes are considered IP codes.
Does the turbo charger come into play at start up and idle? It’s a new GM8 with a vacuum controller. Maybe I’ll hook up the boost gauge and see what it’s doing. I might also rig it up so I can drive it around a little and see how it acts. Thanks guys.
 
@Goose57 Specificaly which codes are you seeing come up active and inactive?

Cylinder imbalance codes usually indicate one of the following.
1. air intrusion (clear return line will show this)
2. poor fuel pressure from the LP
3. valve train issues (pull valve covers and check rocker retainers and push rods)
4. faulty injectors.

I need to go back and re-read the thread to see what all has already been done (memory isn't that great) but if you have already checked and verified the first two items, you might need to check the valvetrain.
 
dbrannon79 said:
@Goose57 Specificaly which codes are you seeing come up active and inactive?

Cylinder imbalance codes usually indicate one of the following.
1. air intrusion (clear return line will show this)
2. poor fuel pressure from the LP
3. valve train issues (pull valve covers and check rocker retainers and push rods)
4. faulty injectors.

I need to go back and re-read the thread to see what all has already been done (memory isn't that great) but if you have already checked and verified the first two items, you might need to check the valvetrain.
Click to expand...
Thanks let me get the injectors back in and do a compression test. I’ll get some video of the clear return line. I believe the fuel pressure at the gauge is 6 to 9 psi it’s a liquid filled gauge and it jumps around a lot. The motor does run when I open the fuel t-valve. I believe it’s 5 or 6 cylinder balance codes always in the history and I believe it changes each time I clear and recheck. Some of my videos in some of my posts have been removed I’ll get some new ones. Thanks
 
Hi all, I’m still waiting on injectors that were tested by Pro Tech Diesel so I can do a compression test and continue troubleshooting. I wanted to put these 2 videos on here of the time set and TDCO offset I did on my truck because some of the videos of this process were removed in my early post. My truck is a 95’ and I used a recommended 96’ procedure w/ a Tech 2. I just wanted to make sure the timing is right so I can go troubleshooting and not worry about the timing not be right. I’ll be back on here after doing the compression test w/the results and probably more questions. Thanks guys for all the help.

 
Hi all I just reinstalled my injectors after having them checked out they said they were all ok see post #152. Did a compression test because I keep getting cylinder balance codes on all eight cylinders. All 8 cylinders are at 400+ psi. I do need to verify I have my vacuum lines hooked up right that go to the waste gate solenoid the line that comes from the vacuum pump is going to the right port on the solenoid if you looking from the passenger side. It’s getting 12volts. And it’s getting vacuum at the turbo. I’m still getting cylinder balance codes in the history on all eight cylinders. No current dtc,s No air in the clear return line. Fuel psi 8 to 9 psi. Still runs like crap. After it’s warmed up and I shut it off and start it up right away it starts right up but if I let it sit for a couple of minutes it takes awhile to start w/black and white smoke from tail pipe. I also included in the videos of the engine data off the Tech2 scanner. Should I redo the timing or move the IP a little. I still have the original IP and it ran fine on my truck maybe I’ll have to install it and see if it makes a difference. I just don’t understand why I’m still only getting cylinder balance codes ? maybe timing issues or a bad rebuilt IP? If the IP is bad why no codes? Could a bad IP cause all 8 cylinder balance codes.
I hope someone can pick up a problem from my engine data video. Thanks guys.


 
on your old IP were you getting these same balance codes? with the amount of raw fuel coming from the exhaust and the "missing" it's doing I'm leaning towards something in the IP or injectors dumping too much fuel.
 
Well not sure about what others think, but if your sure it's not the injectors, I would try reinstalling the old IP. if that does the trick, then contact the seller about exchanging it for another.

Not saying the seller is the problem, ALL DS4 IP's now are re-manufactured with "used but good" parts. Mainly the pump head and rotor. Stanadyne stopped producing parts for them back around Covid times so now just like trying to get a reman quadra-junk carb for a gasser, there are no more "NEW" DS4 pumps or parts for them.

if you plan on keeping your rig on the road for years to come, start planning and collecting all the parts you need to convert it to fully mechanical injection using a DB2 ip. that is if your local area will allow you to modify fuel and emissions and still be legal to drive on the roads. we all can help you find all the items needed and get it all up and going when that time comes. your biggest expense is a stand alone controller to run the automatic trans. not unless you invest into a "built" 700R4 mechanical trans, yet still that is a big expense too.

you can thank our Military for keeping the DB2's alive for longer. from what Will and others have said, they renewed a contract with the MFG to keep them in production for the Humvee. I get their reason too, who wants electronics when your out in the field in another country and can't get parts. for the DB2's all you need is fuel, air and a battery, it will run!
 
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