What are the most common LLY Duramax engine problems?
The 6 Most Common LLY Duramax Problems. 1 1. LLY Bent Rods. While the LLY made competitive performance numbers back in 2004, the engine is certainly not competitive to the modern day diesels. 2 2. Head Gasket Failure – LLY Duramax. 3 3. EGR Valve Failure. 4 4. Glow Plug Failue – 2006 LLY Duramax. 5 5. Overheating in Pre-2006 Models.
What causes head gasket failure on LLY Duramax?
Head Gasket Failure – LLY Duramax The LLY has the largest turbo in it out of any other 6.6L Duramax variants. Outside of it being the largest turbo, it had the largest compressor wheel and the tallest exhaust vanes. The end result is having an extremely efficient and high-flowing turbocharger.
What kind of turbocharger does LLY Duramax use?
In addition to EGR, the LLY switched over to variable-vane turbocharger (VVT) which helped improve engine performance over its predecessor.
Why are my LLY glow plugs not working?
I have a l5p had a lml and lbz but at work mostly work on 6.0 powerjokes and when the hpop goes bad they will usually start with a little spray of starting fluid cause during cranking it is not spinning fast enough to build pressure.
What’s the best glow plug for a Duramax LLY?
The GM 97326305 Glow Plug is a direct replacement for your 2004.5-2005 GM 6.6L Duramax LLY. Replacing failed glow plugs can eliminate check engine lights and hard starting. This OE replacement is built to the same high quality standards as the original components that were installed on your truck from the factory. Sold individually.
What kind of coolant does a Duramax LLY use?
The Dorman 904-168 Exhaust Gas Recirculation (EGR) Cooler Kit for your 2004.5-2005 GM 6.6L Duramax LLY is quality-engineered to cool exhaust gas and recirculate it back to the engine. Replacement prevents coolant from leaking into the exhaust manifold and may protect the engine from extensive damage.
In addition to EGR, the LLY switched over to variable-vane turbocharger (VVT) which helped improve engine performance over its predecessor.
Where is the pressure relief valve on a Duramax engine?
Included on the fuel rail is a pressure relief valve which is a spring-loaded valve on the back side of the fuel rail. The valve’s job is to release pressure in the event that it becomes too high. When pressures surpass the allotted threshold, the spring compresses, releasing rail pressure.
Is the LLY Duramax the same as the LB7?
Similar to the LB7, the LLY Duramax is reliable, powerful, and lacks most of the emissions found on modern day diesel trucks like the L5P. LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had. Instead, many LLY Duramax problems stem from overheating.
When was the last LLY Duramax Diesel made?
The LLY Duramax was produced from 2004 to 2006, before it was eventually replaced by the LBZ Duramax. It was a stepping stone for GM as they begun to encounter stricter emissions requirements thanks to the federal government and California.
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.
How many versions of the Duramax diesel engine are there?
All told, there are six different iterations of the Duramax diesel engine: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Each version of the engine has its own issues and quirks, and some are less problematic than others.
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.