Quick and Easy Guide: Smoke Testing an N55 Engine Common Issues to Look Out For:In this video I show you how to set up an N55 for a smoke test of the intake and engine. Performed a smoke test is important after a big repair to make sure there are no unmetered air leaks present which can lead to P0171 and P0174 unmetered air leak codes. Air leaks also reduces fuel economy and can lead to misfires in the engine.
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Smoke Machine
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