Put in the turbo master. The original part stopped working and kept the waste gate open. On the way home tonight it threw the codes 12 78 81 and 91. I think my head gasket is gone need some suggestions. Thank you so much 94 c 3500hd turbo auto 2wd

Sounds like your Turbo Master is set a little too hot and your overboosting.


12- Means your engine is off, no prob there, shows up everytime.


78- Wastegate solenoid fault sounds like you unplugged your switch, needs to stay plugged in, whether its actually got vacuum supplied to it or not, to keep the computer happy.


81- 2-3 Shift Solenoid Circuit Fault, clear it see if it comes back, then check your tranny wires, is there a problem shifting from 2nd to 3rd?


91- Cylinder #1 Balance Fault. That's not good, hopefully you just cracked an injector line, since #1 is the easiest to reach, and didn't retighten it. Truck should have a definite dead miss, no smoke but a leak if its a line loose, and white smoke if its a hung open injector or washed out cylinder or head/head gasket/valve problem. Normally, holes 7,8 give fits on these trucks, so I expect you to say you left the line loose or cross threaded it.

Nope didn't touch the injectors. I does blow a hell of alot of smoke when i fire it up. and goes through about a gal of antifreeze every couple of days when she works hard.http://www.dieselplace.com/forum/smileys/Angry.gif None of it is going on the ground so i am also afraid of a head gasket. Any more suggestions. I did clear the code and nothing came back. thanks diesel guy for your info.

A CO2 test can confirm if your headgasket is blown.


Alot of smoke at start-up can indicate weaK injectors.

Ok the injectors would make sense but what is a CO2 test. Thanks agian

A CO2 test can confirm if your headgasket is blown.


Alot of smoke at start-up can indicate weaK injectors. Yeap it can point to the injectors, but that wouldn't explain the gallon of anti-freeze a week would it. My money is on the head gasket or head

bowtie is right, whether the injectors are performing well or not, a half gallon a day out the tail pipe has to be addressed before you can judge them. It would be a really good idea, while you got the heads off to remove the cat if you havent' done so already. Platinum, anti-freeze and carbon make a horrible combination, it probably weighs 40lbs right now.

I just want to thank everyone for there info. I found this stuff called blue devil. The stuff works awsome. It sealed the head gasket lead and stoped the antifreeze from disappering. got some power back now i need to look into the injectors. thanks again

Where did you get the blue devil? I did a google search and only got hits unrelated to our topic. My VW diesel is losing water, albeit at a much slower rate than you described so I think it might help me avoid a headgasket change for a while.

http://www.gouniversalproducts.com/ that is the home page...Well my truck head let go i think. No power whatso ever. So i am gonna have it towed. What should i do. head gaskets 1600 if it is just the gaskets, or remand motor for 5800 with a 1 year warranty. I don't have the time to do it myself

You have to make the call. I'd do it myself for $1600 on the head gasket. When it comes off you'll see if the head's cracked. salvage heads are running $200-350. rebuilt would be more.

How many miles on the motor?

$1600???? like american dollars? for head gaskets? If I remember correctly, I paid only about 6 or 700 for a set of rebuilt heads for my truck, new valves/springs guides, sleeves in the water jackets to prevent cracks from leaking coolant, 50 bucks for gaskets and put them in my self as a weekend project. I'm pretty sure I got them from Lander's Discount Automotive, but I'll double check on that, I do remember they were way under everyone elses price and they've worked well for me for the past 2 years.

only 80000 miles on the beast. I plan on doing the head gaskets myself. I am gonna tear apart the heads on sunday to see if i need new ones or just gaskets any suggestions on what to look for would be great

Look for cracks on the combustion side of the head.

Well, took the heads off and they were junk had them pressure tested and they didn't pass. Got remand for $432 a piece. So the gaskets were also junk. Another question...my turbo bushings seem to be a little loose not blowing by oil yet. THanks again

It will get real loose when the bushings are warn. When you have an inch of play in it or so.