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2008 Cobalt Wont Start

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New User

Dec 19, 2021, 9:40 PM

Post #1 of 2 (335 views)
2008 Cobalt Wont Start Sign In

Hello All,

I'd consider myself a pretty good do it yourself mechanic but I am at loss with this one.

Prior to the issue, there was no problems with the vehicle. It is a 2008 Chevy Cobalt 2.2L with 199K. I've owned it since about 70K and it has always had its routine maintenance. The night before the issue, I filled up the gas, drove it to work the next day, no issues. When leaving work it cranked but will not start.

The battery is good after testing (charge, CCA etc)
Fuel pump works with good PSI
Fuel rail is good
All injectors are clean and have excellent and timed output
New spark plugs and coils
New starter
All fluids good
EVERY fuse was pulled and tested
The only code i got was P0016 and I replaced the camshaft position sensor for that code.

On crank, it sounds clean and normal. No engine sounds/rod/piston/cracks from what I can tell.

Sprayed starter into the intake on crank with no change. There is some normal deposit build up but nothing to bad and no sludge.

I have no idea where to go from here.

The only odd thing i discovered was that cylinder 1 has a very prominent spark while 2, 3, and 4 have a significantly weaker spark. I am not sure if this is normal. All plugs and coils were rotated to 1 and had a strong spark at 1, just not 2, 3, 4.

Thanks for the help! I just feel like I am at a brick wall. I think I covered everything but please ask if you need clarification.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 20, 2021, 2:07 AM

Post #2 of 2 (316 views)
Re: 2008 Cobalt Wont Start Sign In

? Have you pulled a spark plug AFTER this "no start" scene? Is it wet after cranking?
I trust you have a good feel for this car and care for it matters when those things were done.
The issue I see now is getting fuel so recently it just might be all wrong to not flammable enough to fire? Starting fluid usually will work but if plugs are self grounded already by wetness even new or newer. That would normally be the test I would do also.
Said you saw weak spark IDK on what type test is telling. If there's any compression and engine is on time both spark and valve timing it should at least react if not run.
Problem has to be fuel can't fire or that weak spark can't do it.
Not sure but maybe leaving plugs out to dry both them and cylinders while out I'd disable fuel delivery and check compression because you are ready then to do so,


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