What are the problems with the Duramax LB7?
One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.
What happens if the crankshaft on a Duramax goes bad?
Perhaps the most devastating of all Duramax failures is a broken factory crankshaft. Not only does this mean game-over for the engine, but it results in a truck that’s down for weeks (if not months) and a huge chunk of change missing from your wallet.
Are there any issues with the Duramax check engine lights?
Glow Plug System Issues – Nearly half of the check engine lights that come in for the Duramax pickups are for glow plugs. The glow plugs burn out over time and can be a real nuisance to remove from the aluminum heads sometimes.
Are there any problems with the Duramax water pump?
This seems to be inherent of the factory water pump design. Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.
When to replace battery in GMC Duramax Diesel?
GP cascading (replace one, then next week another, etc.) failure is commonly experienced around the time you also have a battery failure. And when 1 in the pair fails, it’s usually the pass side. Heat, not frigid, kills batteries.
What causes a Duramax battery to wear out?
Any difference between the batteries’ open-circuit voltage will induce current from the one with the higher voltage to the other one, which will prematurely wear out the higher-voltage (newer) battery. Just happened to me. Passenger side was fried but the other was carrying it.
Are there any problems with the LLY Duramax?
In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring.
Why is my Duramax diesel engine not working?
The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.
One thing the ’01-’04 LB7 Duramax is notorious for is injector failure. The two primary failure points of the factory injectors are internal cracking of the injector body itself and corrosion-induced failure of the internal ball seat.
Why are the Pistons on my Duramax not working?
Low-quality castings from its suppliers and a reduced amount of meat present in the wrist pin area (thanks to the use of wrist pin bushings) are to blame for factory piston failure. In most cases, the cast-aluminum piston cracks along the center line of the wrist pin, as shown above.
Do you need a main bearing girdle for a Duramax engine?
Note that a main bearing girdle isn’t a requirement (and aren’t even employed) for most Duramax engines built to handle big horsepower and torque, but it is a great peace of mind item. As the old adage goes, you can’t overbuild an engine.
When do I need custom studs for my Duramax engine?
A set of Custom Age studs are always on order when 100 psi (or more) of boost will be sent through a Duramax engine. The process of feeding boosted air into the heads as effectively and restriction free as possible is another area of the Duramax that the aftermarket has improved upon.