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2004 Chevrolet Colorado. Inline 5
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2004 Chevy Colorado 3.5 5cyl. No compression in back 3 cylinders, dry an wet test,, Any suggestions, thinking bad head gasket..???🤷🏾‍♂️🤷🏾‍♂️
 

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Replaced a head on mine, vavle seats were bad stock motor. Had low compression on that cylinder. What did you plugs look like? I would't think you have a bad head gasket not very commonon these. Did the truck sit for a while?
 

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Do a leak down test so you know whether its valves leaking, intake or exhaust. or rings, pistons. Bad valves are a very common issue with '04.'05 motors. Been there done that.
Luck.
Hope I am wrong and it's something simple..
 
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