Misfire issue

onedoughboy said:

So you have a 2006 Cobalt 2.2l with 57k, with a miss on 1 & 3, you changed plugs, you swapped injectors, you replaced the coil pack, and verified compression.

How long have you owned it? When did it start missing?

Was the coil pack new or used. Could be two bad ones, seems not likely. There is a ground wire on the transmission about level with the starter, on a bell housing bolt, that is known to become corroded, but the miss fire would be random.

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onedoughboy said:

I reread the entire thread, in your first post you stated that the car shuts off after 30 minutes. Is it always 30 minutes? Do you have any codes that are U1000? Do you live in a wet area, by salt water? Has the car been in an accident? Flood? There is a piece to this puzzle that is missing. Who would scrap a car that has 49k because a recall... These cars are simple in design. I'm still thinking ground wire on transmission, or timing. But a broken wire, corrosion in a connector, loose connection, intake gasket leak or vacuum leak, could also be causing this. I once had a cobalt that would quit once in while, while driving down the road, turned out to be corrosion inside the main fuse box. I figured maybe someone liked to power wash the engine compartment to much.

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