![]() We treat all 2006 as a LBZ as far as modifications. The 2006 LLY and LBZ engines are essentially the same when it comes to modifications. This creates some confusion as the 06 LLY is distinctively different from the 04.5-05 LLY. The early 2006 engines were still called LLY and the later 20 'Classic' models became the LBZ. This EGR Override Circuit 'Finger Stick' is For the GM 2500/3500 LLY & LBZ 6.6L Duramax Diesel Engines (Years: 2006-2007).This circuit modifies the MAF signal to the computer on the LLY and LBZ engines (Not LB7, Not LMM) to expected levels when the EGR is blocked off, modified or a big free flowing exhaust system (removing the cat) causes the ECM to set an EGR code and display the check engine light / service engine soon.
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