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PO300 and brutal fuel mileage
I've got a 2002 Yukon Denali, 6.0 Vortec. It recently started throwing a PO300 code and my fuel mileage has gone from about 14 mpg to about 9 mpg. Idles fine when cold but rough once it has warmed up. I've replaced spark plugs and spark plug wires, but that hasn't fixed anything. Wondering if...- CurtBrass
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- Replies: 18
- Forum: Engine & Drivetrain
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Problem with front climate control
I am having a problem with the climate control in my 2002 Yukon Denali. Regardless of where I set the temperature dial on the main climate control, it only blows hot air. good thing this is happening in February and not July! When I press the A/C button the orange light flashes three times...
