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GMTD scan tech

Thanks guys, can you tell if they are self regulating GP,s without pulling them? When they turn on they run about 6to7 seconds then if I turn them on right away they only run for a second. Are they still in danger of swelling because their no marking son them? The motor starts cold w/one GP cycle. I am not opposed to pulling them if they might swell. Thanks.
 
Buy the AC Delco 60G plugs. Attached is a picture as to why you don’t want anything else in there. Quadstar, Leroy Diesel, Twisted Steel Performance (TSP doesn’t sell glows afaik) are all trusted suppliers. If you buy AC Delco anywhere else it NEEDS to be a brick and mortar AUTHORIZED DISTRIBUTOR! Call them to verify what source are legit. The piston out of my optimizer with less than 70,000 miles on it is the one on the tire. Some are pics of similar events. The head with the broken off plug is mine. Nicely destroyed precup. I still never pulled valves but 50-50 chance one is destroyed. I got LUCKY! Zero block damage. The pic with piston in engine is someone elses- I am pointing out where the cylinder wall is scratched and will blow by so now oversized piston is a requirement for his engine.
I’m warning you as strongly as possible: DO NOT EVEN START THE ENGINE AGAIN UNTIL THE 60G PLUGS ARE IN!
 

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About the 9G plugs:
Yes decades ago that was the part number and it was not self regulating. Quite the opposite it was a plug that had issues burning itself away. And when water was mixed in the fuel (less common when we had real diesel) GM was convinced that caused the damage. And by taking that legal stance they pushed blame on the owners and saved millions in replacing engines.

If you buy a 9g glow plug now- that number is reused and is for a dmax.

If you find original 9g plugs for the 6.2- my suggestion is to fill the glow hole with beach sand first- then install. About one measured cup per cylinder should do it.
Oh, and remove your drain plug and drop it in the intake manifold. Then install the 9gs and start the engine.
This will get you to your inevitable end much less painful.
 
Looks like I’ll have a little time before I go to the 60g GP. I e-mailed QS about the reman IP not running good on my truck and e-mailed a video of the truck w/ the original pump on. Also he said the scanner data I sent him previously had good pump timing numbers on it and didn’t indicate to him a bad pump. He did ask for the name tag data on the pump. I sent the tag data and a video w/the truck running after a cold startup w/ the original pump on. The only thing I can think of I did different while installing my original pump is I left the drivers side Inj. lines at the Inj. loose and started it up. It started right up but remember I had the ECT fooler on there. I hope that didn’t make a difference. I did have a clear return line w/the new pump on running badly.

Here's the video I sent them today w/ the truck starting up cold w/ my original pump on.
 
Goose57 said:
Looks like I’ll have a little time before I go to the 60g GP. I e-mailed QS about the reman IP not running good on my truck and e-mailed a video of the truck w/ the original pump on. Also he said the scanner data I sent him previously had good pump timing numbers on it and didn’t indicate to him a bad pump. He did ask for the name tag data on the pump. I sent the tag data and a video w/the truck running after a cold startup w/ the original pump on. The only thing I can think of I did different while installing my original pump is I left the drivers side Inj. lines at the Inj. loose and started it up. It started right up but remember I had the ECT fooler on there. I hope that didn’t make a difference. I did have a clear return line w/the new pump on running badly.

Here's the video I sent them today w/ the truck starting up cold w/ my original pump on.
Click to expand...
I wouldn't delay on the glow plugs.
You've seen the pictures displaying what crap glow plugs can do
 
I was scrolling the the diesel forums to read up on the DS4 pumps and found this TSB. the new pump that I had on my truck when it was running bad was a 5521. I had forgotten that when installing my original pump I had to modify the male plug on the original pump that went to the PDM extension harness I got from Leroy’s when I fist got the truck. Both of my PDM,s have grey colored backings. I had to file the thin square protrusions off sides to make it work. The upgraded harness I got from QS (the same time I got the new pump from them) wouldn’t plug into my original pump. Help me understand the above TSB. Is the new pump the upgraded pump or is my original pump the upgraded pump. I did post a pic of my original pumps I’d tag back in 23’ I’m trying to find it. Its tag info: C1. DS4831-5521. J. It also had a white sticker that had 5521 03/05/01.
QS did ask for the pumps tag info🤔

IMG_1070.jpeg
 
Sounds to Me like You had the grey box Stanadyne drivers. They do use a different plug than like the flight systems.
First Stanadyne I bought I had to also get the adapter hadness that plugged into the extension harness.
Since then I got the Leroy Diesel extension harness that plugged direct into the Stanadyne grey box.
So I have one Dorman on an extension harness and running on the Stanadyne on its own harness without the adapter plug.
I also have another spare driver in the jockey box.
 
dbrannon79 said:
Sounds like the new IP has been upgraded and your old one was not. once you modify the PMD connector it will fit both old and new styles. I had to do mine when I installed my extension harness and new PMD.
Click to expand...
Did you take look at the TSB. It’s very confusing to me. The new pump and engine harness seems to be the original design (as per TSB) and my original pump and engine harness and PDM extension harness are the currant design very confusion. Shouldn’t it be the other way around?
Here’s a pic of my original pump. Notice the white sticker. Was it repaired in 01’ or upgraded?
 
Goose57 said:
Did you take look at the TSB. It’s very confusing to me. The new pump and engine harness seems to be the original design (as per TSB) and my original pump and engine harness and PDM extension harness are the currant design very confusion. Shouldn’t it be the other way around?
Here’s a pic of my original pump. Notice the white sticker. Was it repaired in 01’ or upgraded?
Click to expand...
That is odd. I would only assume the new pump has an aftermarket harness on it of a chinese mfg. or the new pump is a reman that when it came in to them as a core had not been updated. This makes me wonder if updated parts were used in it's rebuild, as older parts before the update are still in circulation and if deemed still usable by the rebuilder, would be installed into the pumps going back out to be sold.
 
dbrannon79 said:
That is odd. I would only assume the new pump has an aftermarket harness on it of a chinese mfg. or the new pump is a reman that when it came in to them as a core had not been updated. This makes me wonder if updated parts were used in it's rebuild, as older parts before the update are still in circulation and if deemed still usable by the rebuilder, would be installed into the pumps going back out to be sold.
Click to expand...
I thought I mentioned in my post that the new pump was a reman. I read some where the reman pumps come w/ red ID plates. Still curious if my original pump was opened up at some point because of the white sticker. I still haven’t heard anything back about the reman pump. I called Huckstorf Diesel about checking the reman pump out just in case QS doesn’t warranty it. And Huckstorf said he could not check the reman pump because it was already on a truck and running. He said the fuel left over in the pump would ruin $500 worth of testing fluid on the tester. But he can check out a reman pump that has never been ran. Boy that was a gut punch. Looks like I might be buying another pump and sending it off to be tested. Or hope I get another reman pump under warranty and still have to have it checked out. Boy this could get expensive. I also may call around to see if anybody will test this reman pump that has already been run. I’m going to call him back and ask how much to rebuild my original pump.
 
One would think they have ways of draining or flushing a pump so it doesn't contaminate their test fluid. I feel like that was an exaggerated answer for "no we don't test without rebuilding"

Yes the red tag is an indication of a reman. the blue tag on your old one is or was put on when new. GM had many recalls or campaigns where folks would have the dealers replace them with the updated pumps when in for service. your old pump has never been into since it was new and the date was it's build date.
 
Hi all, just got a reply from QS. He said the pump is technically out of warranty. I could send it in for inspection and they could see what they find. Said it would have to be torn down and resealed before even hitting the test bench $500. He did say he could work with me as much as he can. Maybe he might find a defect when he tears it down for inspection. He never mentioned anything on why I kept getting cylinder balance codes. Back in 23’ after I purchased the pump from them I asked if the pump was
a newly rebuilt one or has been sitting on the shelf. They assured me that their pumps were rebuilt w/ new heads and rotors and tested. I thought I read on here that Standadyne quit making parts mainly heads and rotors. I believe QS is a Stanadyne distributor but I couldn’t find them on their distributor map. Maybe they couldn’t get new heads and rotors. Maybe I’ll get lucky and they will find something on tear down. I did find a pump shop Seidel Diesel that would put the pump on the test bench with a tear down and supply data. I’ve been talking w/ several pump shops explaining how the truck ran bad w/ the reman pump and cylinder balance codes and how it ran fine w/ my original pump on and no codes. And also why I kept getting balance codes w/ the reman pump. They did mention that the obd1 system was very crude and maybe that’s why the lack of IP codes. I got myself in a trick bag by not having the new reman IP bench tested. I really don’t want to buy another pump because I would have to have it tested also. Maybe I answered my on question. I’m a curious if the pump is bad or not. I guess the silver lining in all of this is I sure am learning a lot. Any opinions appreciated. Thanks.
 
There might be other issues within the pump besides the head and rotor. if it was rebuild a couple of years ago and I'm sure QS like others when they got the news of Standadyne shutting down manufacturing the parts, they all bought up all they could to keep them afloat for a while.

as far as letting QS look and test out the pump, that's up to you. being he will work with you on it, that is a plus. another thought might be if someone here in the forums has a running engine they would chuck it up to and try running it for you just to see if they get the same results, then sent it on to QS for inspection and testing. Not sure if @Twisted Steel Performance would help in this manor of course with a nominal fee.
 
dbrannon79 said:
There might be other issues within the pump besides the head and rotor. if it was rebuild a couple of years ago and I'm sure QS like others when they got the news of Standadyne shutting down manufacturing the parts, they all bought up all they could to keep them afloat for a while.

as far as letting QS look and test out the pump, that's up to you. being he will work with you on it, that is a plus. another thought might be if someone here in the forums has a running engine they would chuck it up to and try running it for you just to see if they get the same results, then sent it on to QS for inspection and testing. Not sure if @Twisted Steel Performance would help in this manor of course with a nominal fee.
Click to expand...
I just got done putting the reman pump back on and will finish putting the intake back on tomorrow. The reason I’m trying the reman pump again is that I might have had air still in the system the first time I put the pump on. I say that because I had forgot I left the drivers side injector lines loose when installing my original pump and started it up w/loose injector lines. What a mess. That is the only thing I did different when installing the new and old pumps. But maybe that’s what it took to get all the air out of the system even though I had no bubbles in the clear return line. I don’t know maybe it’s just wishful thinking.
 
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