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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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Old 01-30-2013, 07:07 PM
Diesel Fan
Status: Diesel Fan


Default new 94 Burb 6.5l turbo

I am going to be getting a 94 GMC Burb with a 6.5l turbo. Currently not running was told that it was a bad IP but it was worked on at an auto shop not that auto guys can't work on diesels they just don't at this shop. After doing some homework I think it's more a PMD problem. Also it was sitting the last two years so if anyone out the can give me some knowledge on what maybe some other issues i should pay attention to that may occur. I am a diesel mechanic by trade but am not familiar with the 6.5's. Any help would be greatly apprecieated. Thanks
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Old 02-04-2013, 07:22 PM
Diesel Enthusiast



The way to tell if its the PMD is if it cranks and that it, no firing is typically a sign of no fuel, granted that the glow plugs are working fine. Any automatic transmission that's been sitting for two years is also something to watch for, but if its the 4L80E its a pretty tough tranny. The only major problems that I've heard come from the 6.5 is block cracking, which usually happens after long running times and not allow the engine to idle for a while, or not letting the engine warm up properly. I usually wait till the temp gauge is off the 160 mark, it takes a little while sometimes, but is worth it if it keeps the block from cracking. And on a lot of these engines, the oil filter housing has a tendency to start leaking. I've heard of some heating problems that happen, but that's a problem you only get when you try to tow to much. If you bought this burb to do some towing, just keep it light, they don't have any "real" diesel power but will cruise down the highway and give you 23 mpgs. They seem pretty reliable and run strong, mine has a little more than 195k on it and still get 20-23 on the highway running 55-65. As long as you push the engine too much it should be good.

MontanaTechPetroleum's Sig:1996 Chevy C2500, 5 spd, 3:73 gears, manual glow plug override, Bosch 80034 glow plugs, S&B Cold Air Intake
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Old 02-07-2013, 05:50 PM
Diesel Fan
Status: Diesel Fan



Thanks for all the helpful information I should be taking possesion of the burb in about a month and a half and your tips are deffinetily going to be looked at. Another question I had was can u get alot more HP's and Tourque numbers out of it and if so where would i look cause i read a article in Diesel Power Magazine of a land speed racer who used the 6.5 as his building block to be that would say that its a good motor
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Old 02-07-2013, 08:39 PM
Diesel Enthusiast



Well, by a lot more, relative to the actual engine power kinda. The biggest thing is exhaust, you'll want to put a 4 in pipe, straight will get it less resistance, but I've heard in the suburbans, it can be quite loud in the cabin. If you want it relatively quite, you can get muffler kits, don't know how they work. Air intake I've heard that you can butcher the stock box and get a lot better flow, I personally get the S&B cold air for $270, but probably shouldn't have done that. Just open up the intake and put a K&N cone on it, lots of people get 97+ intakes and put them on, those will provide sufficient air. DO NOT buy "marine 40HP" injectors, I've seen where people don't gain power from them and they are just a scam. Heath Diesel is a good place to look for the performance mods, he's the guy with the land racer, or at least he has the fastest 6.5 diesel recorded. Heath Diesel also sell performance chips, the two options are 40 hp and (80-95) ft/lbs, and 80 hp and 160 ft/lbs. Rear wheel gains are roughly 30 hp and 60 hp, so good gains. Lots of people get a TurboMaster from Heath diesel, for a 94 you should be able to make your own, a link is at the end. This allows you to control the amount of boost, but there is a 2 mpg loss with it, if you do this keep boost under 15 psi, that's about all the engine can safely handle. That's about all you really can do without completely changing everything. I've seen some of these cranking 300 hp but there was also a lot of money put into them, almost enough to just go buy a D-Max.
On another note, you might want to make a manual override for the glow plugs if you live in a colder environment. My dad and I did it in an hour, and we didn't know what we were doing. Mine is a 96 so its setup different than yours. But this is what we did for mine (there is a youtube video with a 95 I think is the same as a 94), go behind the engine cover and there should be the glow plug relay and there are 3 wires running to the little clip on the back of the relay, real tiny wires. They are hot, ground and one's just a signal wire. Anyways, cut the hot and signal wires and just run a switch to it. If you do this, get self regulating glow plugs, AC 60g and Bosch Duraterms 80034 are both, I got the duraterms and cold weather isn't an issue anymore (I live in Butte, MT). This does set off a trouble code, my dad fixed that, he's good with electronics, took a course with them though the Army. I think he ran a diode on the yellow wire (signal) to a 12 volt hot. This will make the factory glow time come on and the switch will let you keep them on a little longer.
If you really want power, buy lower compression pistons (17.5:1) I've seen, currently 21:1 compression and get a holset Hx-35 turbo from a cummins, the lower compression lets you safely run higher boost levels and the Hx-35 is capable of 50 psi, as opposed to the 7 psi max from the stock turbo. You'll get higher boost with the engine at higher rpms, but you'll have a little lag at the lower one's, I've seen somewhere that someone got 353 HP and 650 ft/lbs of torque doing this.
Heres the links:
TurboMaster - DIY Turbo Master
95 Manual glow control -
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Old 02-10-2013, 05:17 PM
Diesel Fan
Status: Diesel Fan


Default new burb

thanks for all the help and info.
will have to try those and let u know how everything works out
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Old 02-10-2013, 09:54 PM
Diesel Enthusiast



Yep, no problem
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