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Not uncommon. My guess is because the scanner sees the cam sensor bleed into the signal in the ecm- cam sensor being in the ds4 of course. Not like GM did some tom foolery there…haha

There is a Hummer mechanic- same engine- he MIGHT work on it for you. Tor is his name, has a good reputation for quality but some Hummer mechanics only do Hummer, just like some pickup mechanics wont work on Hummers or RVs. He is in South Jersey http://www.h1-onestopshop.com/

@Boblaw66 if you like, we might be able to walk you through the repairs. This sounds like one of two issues. Air intrusion into the fuel system or a lift pump failing. Stop at any hardware store and get 1/4” diameter clear tubing, replace the 6” long piece coming out the front of the ds4 in...

Ben, normally GM says begin with replacing the 1/4” diameter fuel line that comes out of the front of the ds4 with clear tubing. It is about 6” long in an upside down U shape. You want clear tubing in this location. If you get pvc tubing, it will last about 3-4 years and need replacing...

Haha- you ought to try 5.13 and 12.5” wide tires with a vertical windshield! Now that kills the mileage towing!

Doing the unplug one or the other as our Alaskan friend is suggesting is far faster than trying to gather and interpret data, especially if it is any intermittent issue. I think he is right, jump to that and maybe a go-pro or old phone recording the clear ip line for when it occurs just to...

Yeah, unfortunately the glowshift rankings are high for people they last on and very low for people they fail on. They just seem home run or strike out. I can’t remember how you ran your hose system from your LP. Do you have the return hose to constant circulation or dead heading into the ip?

Where is the fuel pressure gauge tapped at? My push is always using a metal T fitting at the ip inlet like gm says. I’ve seen so many rubber hose failures just before the ip that a gauge tapped anywhere else is not trustable. Thats why the gm kit had the adapter there, but it was for a...

Yeah-thats where a permanent mounted fuel pressure gauge thats tapped at the ip inlet and the clear return line being monitored comes into play. I’ve had guys chase an intermittent rough start for years end up tracking it down because the pressure gauge showed a temporary drop in pressure.

Yes. I can’t remember any years where it doesn’t. Maybe others can speak up if some don’t.

Ok. Fuel pressure going to the ds4 should be 8-14 psi. But so long as it has any pressure at all it should start & run. The clear line - 1/4” diameter about 5” long that is in place for the ip return line- Please post a pic of it so we see you have the correct location. Having a tiny bubble...

Bolt in cat is far better. Remove it for play time, have it to install when needed. If he added cost of a couple flanges added in is minimal compared to issues that can occur.

No

No I do not have the part number. @Rockabillyrat might have it or might even have a couple on hand he might sell? I wanna say 1983-94 6.9 diesel was the years they ran the db2. I never bought the part myself, I always had a “pump guy” that I could just call in the past. And same thing this...

Yup. And in some states, smog certified shops are required to turn in someone without the gear. Hence my reasoning of store the old parts, you can easily explain the parts were removed for that one particular off road or racing application.

The difference is nominal vs absolute. Absolute is NOTHING 14 and larger gets through. nominal is the average that gets through is 14 but could allow a certain percentage up to say 50. So make sure to find the spec difference of absolute & nominal. The Fass water filter is an absolute stop...

Imo going to the Fass water separator is worth it. You can get just a spin on mount for that. Not knowing the other one you are looking at- just hope it works for you. The factory ffm has filter, a poor water separator, and a good fuel heater. Depending on your location if you need a fuel...

I don’t have one but have a few friends that do. The dpf delete itself doesn’t alter power. You will see a slight improvement in mpg because when a regen is occurring it burns fuel to do it. But not like you will save huge money. Because the delete costs money, you will be out money for some...

Jamez, welcome. We need to make sure exactly what your situation is. Please fill out your signature line with truck details- especially any modifications. Pictures and videos are always helpful. Do you have clear fuel line going into and out of the ip (injection pump)? Any bubbles? Can you...

I really can’t remember enough of the gmt400 clutch if this will help or not. I never used one of these and have done half a dozen or so hydraulic clutches in these. Fleets just don’t use manual transmissions unless they have to. The only thing I remember doing them is I hate them and it is...