Stalling at WOT - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 3 (permalink) Old 01-26-2019, 05:37 PM Thread Starter
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Location: Cleburne, Tx
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Stalling at WOT

So, 06 Cobalt, 250k+ miles. Problems began a couple weeks ago. Car suddenly began running really rough one morning. Barely idle, had to really slip the clutch to get it to take off, etc. I had a new icm and coil pack on my shelf from a few years ago, threw that on, (after replacing the fuel filter, to no improvement) and the car ran great agian!

The next day, it died, just shut off on my way home. Had it towed, turned out I hadn't plugged the icm in all the way, and it was loose (felt like an idiot!) plugged it in, again, car ran great!

Ever since, though, the car will randomly die, and take several attempts to restart. If I go to WOT, the car will stutter, and run extremely rough. Almost like it's in limp mode, but I don't get the message.

The cel will flash, indicating severe miss fire, but the only code is P0300, which doesn't help much. I can clear the code, restart, and it's all good again.

(I did pull some throttle actuator control code once, unfortunately I didn't write it down)

Anyone have any ideas?
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post #2 of 3 (permalink) Old 01-27-2019, 08:23 AM
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Code po 300: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer

Read more at: https://www.obd-codes.com/p0300
Copyright OBD-Codes.com
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post #3 of 3 (permalink) Old 01-27-2019, 12:12 PM Thread Starter
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I know what P0300 is, what I'm asking is what could be causing it? It's not all the time, only at heavy throttle openings. Then it runs like it only has two cylinders, but clearing the code and restarting it fixes it.

If it were an actual, mechanical/electrical problem, restarting wouldn't fix it.
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