The LLY is known to overheat easily while towing heavy loads and high-mileage ones are known to blow head gaskets pretty easily. However, the LLY has traded common problems swapping out injector issues for overheating issues and head gasket problems. The LLY engine is very similar to its predecessor. Given the larger turbo and various other small engine improvements, the LLY has the biggest horsepower gains from a tune only compared to any other variation, with the exception of the L5P Duramax. With the Garrett GT3788VA, the LLY Duramax has the largest turbocharger in it out of any other 6.6L Duramax variation. Overall, a great engine, a comfortable ride, and a decent amount of tune-ability for folks looking for additional performance.ĭuramax LB7 Common Problems LLY: 2004.5-2006 The block and internals are strong and the engine itself is certainly capable of surviving the 300k mile mark. Fortunately, by now, any old LB7 will probably have had the injector problem fixed. Outside of the injector issues, these engines are rock solid. Injectors on the LB7 were prone to cracking or leaking, which in most cases requires an injector replacement which can run $3k-$4k. The one crux of the Duramax LB7 to be aware of is the injectors. Additionally, it had a fixed geometry turbo which saved it from any vane stick or turbo actuator issues. The lack of emissions control devices helped boost reliability of these engines as these emissions parts are frequent fault areas on a lot of diesels. Outside of LB7’s sold in California, these engines did not have any emissions control devices such as an EGR (exhaust gas recirculator) or a DPF (diesel particulate filter).
Fuel economy on the LB7 was stout at around 20mpg and the IFS suspension included on the HD’s of the time made these cars a great ride compared to Ford and Dodge. Following success with the performance and reliability of the LB7, this engine became the building block of the Duramax line all the way up until today. The LB7 is the original production 6.6L Duramax V8. With the horsepower and torque of the Duramax nearly doubling from 2001 to 2020, this is certainly true for this 6.6L V8 engine.
Fortunately, today’s engines are able to offer drastic horsepower improvements while still meeting regulations. Between all of the variations, there are really two key trends: (1) more power and performance, and (2) increased emissions restrictions and fuel efficiency.Įngine technology has drastically improved in the last 20 years at the same time as emissions regulations have gotten stricter.
Chevy cateye duramax code#
Before we get into “which one is the best?” we’re going to walk through each engine variation by RPO code and talk about the differences and key features between them.
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