What causes a Duramax LML engine to go limp?
What causes a Duramax LML engine to go limp?
When DEF fluid gets to a certain temperature, the temperature sensor alerts the glow plug control module (GPCM) to kick the heaters on. The DEF heaters fail frequently, sending the engine into limp model with reduced power. There are three heaters located through the DEF system and all are prone to failure.
Why is my Silverado LLY going into limp mode?
The Air intake system on the LLY is fairly restrictive. This creates a lot of heat to be stored in the turbo, intake ect. So essentially you get a heat soaked motor. Added to this is a strain on the fuel system. At 2600 RPM you are sitting close to red line puting a large demand on the fuel system.
What kind of problems does a Duramax engine have?
The 5 Most Common LB7 Duramax Engine Problems 1 Fuel Injector Failure 2 Water Pump Failure 3 Fuel Filter Housing O-ring Leaks 4 Blown Head Gasket 5 Overheating (fan clutch problems, radiator gunk)
What kind of pump does a Duramax LML use?
Duramax “upgraded” the injection pump for the LML models, going from the Bosch CP3 to the CP4.2. To handle the additional power capabilities of the engine the fuel rail pressure was increased to 30,000psi.
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.
The Air intake system on the LLY is fairly restrictive. This creates a lot of heat to be stored in the turbo, intake ect. So essentially you get a heat soaked motor. Added to this is a strain on the fuel system. At 2600 RPM you are sitting close to red line puting a large demand on the fuel system.
What causes a Duramax injection pump to fail?
As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.
What makes a Duramax LB7 diesel so special?
The introduction of common rail injection powered by the Bosch CP3 injection pump made the LB7 Duramax stand apart from other diesels of the day with excellent power and efficiency.
