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03 Zo6 p0300 Miss on cyl 7 & 8 replaced coils plugs still have misfire on 7 & 8

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Code 300 is a random miss rather than a specific cylinder.
If you have a loss of power on one or more cylinders, it could be a fuel injector or mechanical problem in addition to spark.

Posted on Apr 28, 2015

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PROBLEM CODES;P0301,P0302,P0304,P0300,P1399,07-02,09-02,07-03


po301 to po304 are miss fire codes, 301 cylinder 1, 302 cylinder 2 Etc, p1399 means that this must be a Honda manufactured vehicle. All are misfire codes, Could be plugs, wires, coils. ETC, Check and you will find the problem. God-Bless!

May 23, 2015 | Cars & Trucks

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Why won't my car start?


P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Apr 25, 2015 | Cars & Trucks

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Random misfire with code PO300 07 Nissan titan. Put new spark plugs in and a fuel pump still hase vary bad miss


P0300 is random misfire code P0301 would be cyl # 1 etc.
With the odb2 scanner at erase codes turn the engine off. With the key in the run position erase the codes. Run the diagnostics again. If you still have P0300 code Check the plug wires. Loss of compression will cause misfire but it would not be random.

Feb 16, 2015 | 2007 Nissan Titan Crew

2 Answers

What does code P0300 mean for a 2000 volvo engine


P0300 random misfire P0302 misfire cyl 2 P0304 misfire cyl 4.
Check spark plug and wires and coils

Feb 03, 2013 | 2000 Volvo S40

1 Answer

2002 elantra cyl 2 random misfire


Hi there:A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

For example, a P0302 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #2; same condition in P0301 - cyl #1, P0303 - cyl #3 and P0304 - cyl #4.

A code P0300 (or 301, 302, 303 or 304) 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

About your 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.


Hope this helps.

Mar 09, 2012 | Hyundai Motor 2002 Elantra

2 Answers

Miss fire code p0300


Unfortunately, the error code P0300 is a generic misfire code. When the number is more specific, ie P0302, it would indicate a misfire at cylinder #2. In this case, the ECM is merely indicating a misfire in general. If you are experiencing the engine running rough, replacing ignition parts starting with spark plugs and wires is a good place to start.

Jun 24, 2011 | Cadillac DeVille Cars & Trucks

1 Answer

03 SL500 REPLACED SPARK PLUGS, COILS STILL MISFIRES ON 1 WHAT ELSE?


Switch spark plugs, ignition coils and fuel injectors from cyl 1 to 3.
See if misfire goes to cyl. 3. If that happens replace the damaged part.
If is still on cyl. 1 check the compression of the cyl. 1.
If that's ok see if the air mass sensor is working fine.
Also check if there is oil in the plug of the lambda sensor.

May 14, 2011 | 2007 Mercedes-Benz C230 Sedan

1 Answer

Need some more info on some diagnostic codes that came up on my truck & how to fix them. P0137 o2 sensor, P0300 random multi miss, P0303 cylinder 3, P0306 cylinder 6, P0307 cylinder 7


Replace your O2 Sensor and Spark Plug Wires. If you still have the Random Misfire, replace your Spark Plugs, then Replace your Distributor Cap and Rotor. If you still have the Random Misfire you may have a Timing Problem, or Ignition Coil problem.

Feb 17, 2011 | 2000 Dodge Ram 1500 Truck

2 Answers

04' Ram 1500, bad mis-fire. cust repl s/plugs. no help. Codes for coils #7 & 8 w/mis-fire. replaced coils & wire set. Better, but still P0300. Compression good


You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.

Sep 18, 2010 | 2004 Dodge Ram 1500

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