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YouTube - March 10, 2011 3:00 PM Under the fuse block is a circuit board with many diodes or resistors for each circuit on the truck? Is my understanding correct? Do I need to investigate the fuse block on the drivers side fender? With these severe MI winters and much salt in use on our...

Bad grounds is what everyone has said. I'm not sure I found them all. Problem persists. Anyone know a good way to run another ground to the ECM?

APPS has been changed. Have not run the truck without APPS being hooked up. Pedal is very sluggish, it's either accelerating weakly or decelerating, will not hold any rpm. Batteries are 3 years old. I have a new alternator and use the truck for plowing. Everything works as normal when plowing...

I've got numerous codes and drivability issues on my 2001. I believe swapping the ECM is the best test. I cannot find an ECM to use as most of our trucks are still on the road. If you have one, I'd appreciate an email or PM and determine what to do from there. The truck is a 2001 auto trans. I...

My thoughts exactly. ECM or harness is my guess. I turned ignition on and gauges read normal. Start the engine and check engine bell rings, temp gauge pegs, oil gauge reads high. Check gauges light is on. No power, very slow to accelerate, cannot get more than 60-65 mph. I've crawled all over...

No help from anyone? Because it's electrical. If I wanted to swap gear ratio's, you'd be all over it.

Installed new APPS from Blue Chip Diesel. Still have problems. Pedal is very slow to respond, sluggish. Engine is either accelerating or decelerating. It will not hold any RPM, it's just either up or down. Very low on power. Codes are 118, 121, 236, 238, 343, 523, 563, 622, 753, 1693, 1765...

Charging system is fine. Been out plowing snow. I stopped by the dealer, tech says APPS is bad. Now I need to find one before the next snow.

I'm out of ideas. I'm checking electrical connections and grounds now. I'll check back soon. Need this truck running right by 4am!

My 2001, truck starts and runs. Then it takes off, running on it's own, RPM's up and down all by it's self. Seems to be a computer short! It starts, it runs, I can move it out in the yard, can't touch the pedal, it may idle or take off on a rampage and try to ram a building. I thought it may...

Now it's running rough, loping @ idol, wondering whats wrong now! Might have done some damage to the VP44 last night, surging on and off the power in rapid succession.

Toyota... LOL Gonna wait till after the race to work on it. Hope its not something I can't fix in the garage tonight.

My 2001 acted up last night. I needed to tow a friend back to my garage for repairs in a warmer atmosphere. We were at a light, foot on the brake... engine surged real hard repeatedly, scary hard, like gonna take off and run the red light. Took it out for a test drive. It revs up in neutral but...

Being from Flint, MI where we build the Silverado and medium duty trucks, I see a lot of Duramax trucks around. Most are retiree grocery getters and few are used for heavy towing. As you would expect I have not heard anyone complain about their Duramax but I can ask a mechanic buddy of mine...

If the fiberglass replacement from the factory is too much. I'd order a couple sheets of aluminum diamond plate and screw them on. Then polish them to a brilliant shine so as to reflect headlights in tailgaters eyes, LOL

I tow a Haulmark 24ft 10,000 lb. enclosed car hauler every day. I've even loaded it to the max many times. Never needed an equalizing hitch. The only time I used an equalizing hitch on my 2001 2500 quad cab was when I had a 28 ft. 12,000 lb. toy hauler. I can't believe that trailer is squatting...

I too am wondering about gauges for my 6. 7L. I installed gauges on my 2001 and everything had to have a hard wired sending unit. The newer trucks have all the usual parameters available via the ECM? I see Edge has a system but its more than I'd like to spend. Any alternatives to manually...

It was purely a bad injector. If it drizzles fuel instead of spraying it, you get a hot spot on an aluminum piston. As the soft aluminum deforms it can and did scratch / score the cylinder wall. I was concerned that the truck had over-reved and had caused the problem, this was not the case. The...

I had same issue, volt meter on dash went to 8 and the check gauges light came on. When engine was not running, gauge reads battery voltage, when engine is running it appears to be reading alternator output. Mine has 125k miles on it and upon further inspection I could see that my top alternator...

in response to MMeier: Yes 3 weeks. I've never been out to your area, but down NC way it seems everyone is driving a pickup and a fair amount of them are diesel. They only have one technician at that dealer who is certified on diesels from what I understood. Every diesel with a problem had to...