mhjstl
Junior Member
2010 Cobalt LS 120k manual transmission.
My problems started with momentary engine stalls while driving. Car would jerk and continue, as though all 4 cyl had misfired at once. Sometimes, the tachometer would go to zero and the stalls would stop, only to return w/ the next restart. Symptoms increased in frequency, making restarts more difficult.
P0336 was the first engine code, so I replaced the Crankshaft Position Sensor. Now, engine starts are reliable, though prolonged at 6 sec rather than 3 sec. After erasing codes: P0335, P0336, & P0420 reappeared. Also, tachometer no longer works.
Any similar experiences or ideas how to resolve?
My problems started with momentary engine stalls while driving. Car would jerk and continue, as though all 4 cyl had misfired at once. Sometimes, the tachometer would go to zero and the stalls would stop, only to return w/ the next restart. Symptoms increased in frequency, making restarts more difficult.
P0336 was the first engine code, so I replaced the Crankshaft Position Sensor. Now, engine starts are reliable, though prolonged at 6 sec rather than 3 sec. After erasing codes: P0335, P0336, & P0420 reappeared. Also, tachometer no longer works.
Any similar experiences or ideas how to resolve?
