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Misfire P0303 - Need some advice
2008 Yukon. 214,000 miles. P0303 code. Mechanic swapped #3 with #5 plug and #3 wire with #7 and #3 coil with #1. They then performed compression and leak down test. Cyclinder #3 = 100psi. Cylinder #1 = 180psi. Further leak down test on #3 and found 82% leakage. Air escaping through intake and...- ChadinSLO
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- Forum: Engine & Drivetrain
