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  #1  
Old 10-23-2010, 07:16 PM
Hemilvr Hemilvr is offline
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Default Need help with p300 code

Was driving the truck lastnight slow taking off from a red light and all of a sudden my check engine light flashed twice and stayed on. Immediately I lost what feels like half of the cylinders! It's sputtering and smells like a strong sulfur smell coming from the exhaust. The truck is ideling real rough and is miss fireing! P300 is the code for misfireing in multiple cylinders. Anybody have any clue what I need to check and how? Thanks
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Old 10-23-2010, 08:41 PM
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Could be anything from an ignition system problem, wiring, crank sensor, broken valve spring, PCM...
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Old 10-23-2010, 08:47 PM
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Well i was having a problem not too long ago where id be sitting at a light or just idleing and all of a sudden the engine would just die but start right back up and run perfectly for a while then do it again. if it did it when under load you could feel the quick studder but it wouldnt cut out because it was under load. i thought maybe the 87 octane i was running was causing it so i started running nothing but 93 octane and it seemed to run perfect for a couple of months until this happened last night. im wondering if this is associated with that past issue.
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Old 10-23-2010, 11:11 PM
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According to the service manual, P300 = MULTIPLE CYLINDER MISFIRE


Possible Causes:
LOW FUEL
OTHER DTC’S
DAMAGED FUEL LINES
VALVE TRAIN
OBSTRUCTED FUEL INJECTOR SUPPLY LINES
DAMAGED OR OBSTRUCTED HIGH PRESSURE CONNECTORS
EXTERNAL DAMAGED FUEL INJECTORS
INTERNAL DAMAGED FUEL INJECTOR
NO COMPRESSION
EXCESSIVE ENGINE LEAK DOWN


On the web:

Possible Causes:
A code P0300 may mean that one or more of the following has happened:
  • 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 EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
Possible Solutions:

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.


If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. 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 (a.k.a. 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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Last edited by DaveDees; 10-23-2010 at 11:17 PM.
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Old 10-24-2010, 12:41 PM
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Wow! Very informative info! Thanks a lot davedees!!
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Old 10-24-2010, 12:50 PM
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Keep us in the loop with what you find .
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Old 10-25-2010, 12:09 PM
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I sure will!!!
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Old 10-26-2010, 04:25 PM
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Well I got the issue resolved but not before buying a crank and cam position sensor unnecessarily spending about $60.00. Turns out one of the valve springs on the front drivers side was broken which then cause the multiple cylinder misfires! This from what I know is a common event with the hemi motors for some reason. Part cost $3.00 but $185.00 to install. I hope this is of some help with anyone who has or may come across this code or the same symptoms I had.
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Old 10-26-2010, 04:27 PM
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This problem plagues the first gen Hemi engines. Later models use an updated part.
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Old 10-26-2010, 04:31 PM
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Mines an 03 though which is gen 3 and was told that it was an issue as well with them! If it doesn't happen any more though I'll be happy!
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