How To Diagnose Bad Duramax Injectors

Diagnosing bad Duramax injectors on a 6.6L Duramax LB7 engine is a very easy thing to do. For instance, if you see white smoke coming from the tailpipe under load when the engine is revved up, it can indicate coolant bleeding past a blown head gasket. On a Duramax LB7, it usually means excess unburned fuel. A good way to test the fuel injectors is to check balance rates, which most diesel shops can do using a scan tool. Balance numbers of -5.8 and -6.5 means that the ECU is frantically trying to get fuel to lean cylinders to compensate for the bad injectors. A balance rate of -4 is considered the maximum allowable, while "good" is usually ± 2.

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HOW TO DIAGNOSE BAD DURAMAX INJECTORS HOW TO DIAGNOSE BAD DURAMAX INJECTORS • While Duramax injectors are known for their great quality, they are not problem-free. The biggest issue with Duramax LB7 engines is the propensity of their fuel injectors to fail, typically before an engine reaches 100,000 miles. When an injector fails, it can dump an enormous amount of excess fuel into the engine, often at very low speeds. When this happens, the extra fuel is not burned. Instead, it seeps into the oiling system and thus starts filling the engine with diesel fuel. • The bad news is that Duramax injectors are both expensive and difficult to reach in the engine compartment for replacement, which prompted GM to extend its injector warranty to 200,000 miles. The Duramax LB7 enginer is otherwise very reliable. As such, so many people will go through the hassle of replacing some or all of the injectors in their Duramax oil-burners with the idea that they will be keeping their trucks for another 100,000 or 200,000 miles. HOW TO DIAGNOSE BAD DURAMAX INJECTORS • Diagnosing bad Duramax injectors on a 6.6L Duramax LB7 engine is a very easy thing to do. For instance, if you see white smoke coming from the tailpipe under load when the engine is revved up, it can indicate coolant bleeding past a blown head gasket. On a Duramax LB7, it usually means excess unburned fuel. A good way to test the fuel injectors is to check balance rates, which most diesel shops can do using a scan tool. Balance numbers of -5.8 and - 6.5 means that the ECU is frantically trying to get fuel to lean cylinders to compensate for the bad injectors. A balance rate of -4 is considered the maximum allowable, while "good" is usually ± 2. • For more information on how to diagnose bad Duramax injectors, visit our website at https://puredieselpower.com/ HOW TO DIAGNOSE BAD DURAMAX INJECTORS