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The EPA is a part of it, but it is not the main reason you don't see tunes posted online. Speaking from my own experience, I spent MANY a night behind my computer doing tuning for people completely free of charge because somebody did the same for me when I 1st started out when everybody kept...

I'm not saying to pull the covers. If he has the return rate tool set, this should be a very easy test for him to do and should have been the 1st test he did BEFORE pulling the covers. The GM TSB I believe even states to isolate the exterior returns and check bank to bank return amounts 1st.

Pull all the return lines off and isolate them, then measure how much fuel each bank is returning while cranking, how much the cp3 is returning, and then see if the popoff valve is bypassing anything. This is the only way you will find the problem. If it's the popoff you'll see it coming out of...

For the tbi engines the 1st thing you check for shifting problems is the TPS. It controls pretty much everything as far as shifting goes. You can check it with a voltmeter, should be around .4-.5 volts at idle with a nice smooth progression as you open the throttle, and be around 4.5 volts at...

You stated your actual rail pressure while cranking was only 500-600 psi, that is not enough to open the injectors. Common rail injectors cannot open without 1200 psi of pressure and even at that it is hit or miss(1500-1800 is much better). The 1st thing you need to do is fix the low rail...

Common rail injectors need at least 1200 psi to function, PERIOD! Anything less than 1200 psi and they cannot open. 5000 psi is the desired, but actual is the important number. You say your only getting 500-600 cranking, so that is why it will not start on it's own. Low rail pressure during...

Your line pressures sound pretty close off the top of my head. Your line pressure in reverse 9n the pedal sounds a bit high, but not out of spec depending on what mods were done(the transgo valve hd2 says it runs upwards of 370 in reverse).

These values are what is commanded of the EPC, not line pressure. And your obd1 diesel values are quite different from his 01 6.0l.

Only steel shafts got the nylon injection, no aluminum shaft got it, so it doesn't apply to him. The aluminum shafts use external snap rings.

If I understand you correctly, you're radiator cooler is no longer hooked up? If so this is a huge no no unless your air cooler has it's own electric fan on a temp switch. Your radiator is there for slow speed cooling when you're going under 50 and don't have enough airflow to force air through...

Moog lists a 331C u-joint for aluminum driveshaft with the F44(14 bolt rear axle), AC is a 45U0402, & Dana is 5-3615X. Be careful which u-joint you get, the aluminum shaft uses coated caps so you don't get dissimilar metal corrosion between the shaft and u-joint cap.

The 6.0l uses a single stator high stall, the 7.4l used the single stator low stall. You'll want to get a converter for a 98+ for the 07 trans as you will NOT like the 6.0l converter behind a 7.4l. I believe it is a gm88 converter for a 98+ low stall, I like the model that ends in BP with the...

And cooler cylinder temps at low load also leads to wet stacking which can kill your engine. I know many like 180's, I like 190-195's myself for the majority of engines, and for cold weather run as hot of a stat as you can. I know the Duramax used to use a 180 & 185 tstat in them, but the newer...

I helped him time the pump and some other stuff.

Yes, the 3rd brake light MUST work for your cruise control to work and it can cause lockup issues. Unfortunately this is an electrical issue and will require a bidirectional scanner to do anything with. You're going to have to start by using a scan tool to see if the PCM can command the...

The 6.7l fuel system looks pretty similar, if not better than the 6.4's, and they are regarded as very good at stock power levels. It's not until you add power that the lift pump needs upgrading.

Yes, they will interchange.

Ignition switches can also cause intermittent issues in them.

A 0 offset with a 7" rim iirc is stock on 2 wheel drives. The c2500 rear maintains the same track width as the stock 5 lug 2 wheel drive rear axle. All 4x4 wheels have offset as GM did this to reduce loading on the hub bearings. For the obs 2 wheel drive, they ran the 0 offset so there was...

Here's 1 setup that will work, but in this configuration I lose the pressure port that 95's used for the high pressure activated switch that forces the system to inside air when the high side hits 370. I can use a short piece of hose to close couple them, and it will be a REAL close match for...