Question about 1997 Chevrolet Cavalier
HI. You have covered most of the usual areas of concern. This will lead me to believe that your issue is, either, a leaking fuel injector, or a failing fuel pressure regulator. If you are running a distributor cap, the cap my be failing. If this engine dose not have a cap, please disregard the advice about the cap.
Additionally, Check for any vacuum leaks, as well. Leaky vacuum hoses will rob the vehicles power output. A failing fuel pressure regulator will allow more than enough fuel into the cylinder, thus, causing the miss fire, This will disrupt the spark, also.
Posted on Dec 09, 2009
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Posted on Jan 02, 2017
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Feb 24, 2017 | Cars & Trucks
May 14, 2015 | 2005 Cadillac STS
May 26, 2011 | 2005 Chevrolet Impala
P0300....Random/Multiple Cylinder Misfire Detected
so its got a misfire and quickest way out here to avoid a expensive garage visit is to change plugs and Ht leads and see what happens ,HT leads is proper english for fire wires by the way ,see iam learning american ---slowly---
Mar 12, 2011 | Chevrolet Chevy Cars & Trucks
Feb 17, 2011 | 2005 Chevrolet Astro
A code P0300 may mean that one or more of the following has happened:
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders ( spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open
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