The P0300 is one of those codes that gives you a clue what is wrong, but doesn*t really tell you.
It could be:
-Worn out Spark Plugs, Ignition Wires, Ignition Coil(s), Distributor Cap and Rotor (where applicable)
-Incorrect Ignition Timing
-Low or Weak Fuel Pressure
-Improperly functioning EGR System
-Defective Mass Air Flow Sensor (MAF)
-Defective Crankshaft and/or Camshaft Sensor
-Defective Throttle Position Sensor
-Mechanical Engine Problems i.e Low Compression,
-Leaking Head Gasket(s) or Valve Problems
You need to take your Cadillac to a shop that has the equipment and training to do further testing to figure out what the problem is and then repair your car.
〉 Answered on Mar 9th, 2010 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
PO300 code typically points to the need of replacing your spark plugs, are that your coils may be fouling. If you have an air suspension system it directly does not keep a car "level" at an incline. It typically is to give you a more comfortable ride in rough road or faster speed context.
〉 Answered on Mar 8th, 2010 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions
That's a great question. P0300 means that there was a misfire detected in one or more of the cylinders in your engine. A misfire is when, for any number of reasons, the normal combustion process did not go quite as it is designed to.
This can be from a bad spark plug, bad wire or ignition coil, or incorrect fuel/air ratio.
You will need to bring the car to a qualified technician who can look into the problem and isolate the cause.
As for the air suspension - you may or may not have that option on your vehicle. It is definitely not related to the fault misfire fault code though.
Hope that helps - Good Luck!
180 Degrees Automotive, Inc.
〉 Answered on Mar 9th, 2010 by Bogi Lateiner, Owner and Technician at 180 Degrees Automotive
Hello Connie- you either have a bad spark plug, bad ignition coil, bad fuel injector or rarely an injector driver which is not allowing the fuel injector to operate- to answer your second question it is common is some cars but it is not designed to keep the vehicle body level on a steep incline- hope this helps- thanks Super Girls Auto
〉 Answered on Mar 9th, 2010 by Laurie Sarno, Co-Owner at Super Girls Auto