2009 SS. Purchased a week ago drove it home about 200 miles without an issue. Made a couple stops on the way, again no issues. Got home sat over night gave it wash the next day, got in it to move it and it wouldn’t start. It does turn over but won’t start. It does give an indication that it wants to start with a little stumble like it wants to but nothing. I put a set of known working coils and a set of new plugs. Charged to battery to full. Still not starting. Any help or suggestions? TIA

 

41-108 AC Delco Iridium plugs?
Can you hear the in tank fuel pump prime?
Any codes?
a duh question, but is there fuel in the tank?

 

yes
yes
no
yes

is there a chance of a weak starter. It sounds a little different than my 2.2, just stumped on my next move

 

A weak starter is possible, my next suggestion is to firmly push all the fuses and relays into position in the under hood fuse box and tighten those 4 7 mm bolts past any clicks .

 

Charge battery and measure the volts as you crank it. Do the volts stay above 10? If not you need a new battery.

 

Timing chain? Forgetting to mention a CheckEngineLight?

 

I thought of chain but this literally happened from parking the car, with no issues previously to parking, to trying to start the car the next day. No codes or lights whatsoever.

 

Back to battery voltage, it should be more than 12.4 volts to power up the computer and starter and intank fuel pump.

 

Well then don't even look at it. Just start replacing computers like a dealership would. <sarcasm"
Have loosened then tightened the fuse box bolts verry tight, past fearing stripping them?
Check fuel pressure.

 

Thanks everyone for your insight. I had the car towed to a mechanic for diagnosis. Come to find out all cylinders are very low compression. I was surprised to hear that was the case. They couldn’t give me a reason from their standpoint as to why this would occur after driving it with no issues whatsoever. They wanted to tear down the timing assembly for more investigation. I am having it towed back home to check it for myself. My opinion is something gave out in the timing to create this issue. There was not sounds of any sort, no over heating, nothing to explain the issue. Has anyone heard or experienced anything like this?