Question about 2008 Cadillac Cts
Was getting codes P0300, P0303, P0304, P0305. Changed all spark plugs and coil packs on 3,4,5. Still returned P0303 so I tested by switching out coil pack to 1 and spark plug to 5. It returned a P0305 so I changed the sparked plug again. It cleared the problem until driving about 25 miles and then got P0303 again. At a loss, what now?
P0303 code occurs when there is no spark or the spark voltage was too weak to ignite the fuel due to a failed wire or plug.. P0303 (Cyl. 3 misfire) only indicates no spark or a weak spark. There are other codes for other conditions and systems.
Posted on Apr 01, 2015
Error Code: P0303
Cylinder 3 - Misfire Detected
Wiring harness, igniter and fuel injector connectors.
Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression, cylinder No.3. (check valve clearance and throttle plate for excessive wear)
Engine control module (ECM).
Posted on Feb 27, 2014
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Posted on Jan 02, 2017
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