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Discussion Starter #1
I checked a headlight fuse and afterwards my 04 Trailblazer will crank but not start.
All fuses seem to my tight and in the right place. Coincidence or something else?
 

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2004 Chevrolet Trailblazer 4.2L Inline 6 4WD LS
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First thing, check for spark. Test the ignition coils and spark plugs. If spark is good on all 6 cylinders, check for fuel. Make sure the fuel pump is priming and you have fuel pressure. If fuel is good check commpression. Pull spark plugs and attach compression tester. Crank engine for 5 seconds. Compression should be in the 120 range. Any lower than 60 and you may have an internal engine issue. Also dont be afraid to scan the obd2. Hope this helps!
 
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