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P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
That is for a multiple misfire.
See related questions below.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThat is for a multiple misfire.
See related questions below.
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What is does it mean when the check engine light flashes and p0300 on a 1996 caprice?
P0300 is a random cylinder misfire. Ensure engine is properly tuned.
How do you know if a Nissan altima needs a tune up?
One way would be for the check engine light to illuminate and spit out a code P0300 for a random misfire.
Where to start with a P0300 engine light code that is intermittent on a 2001 Nissan frontier?
P0300=random misfire. If this is the only code displayed I would start with the basics, check the spark plugs, the fuel filter, then progress to a fuel pressure test. Also check for fuel contamination (water).
What are fault code's P0300 and P1320 for 2000 maxima?
Trouble code P0300 means:Multiple cylinder misfire detected Trouble code P1320 means:Ignition signal primary circuit fault
What effects can bad spark plugs have on your vehicle?
Bad spark plugs can have a variety of effects on the performance of your car's engine. Signs of bad spark plugs include a rough idle, engine hesitation, hard starting, check engine light illuminated with a DTC P0300 and reduced engine power.
What happens when Check engine light comes on after driving through water?
If you have driven through water and the check engine light in your vehicle comes on, you should take your car to your mechanic. You will want to have your vehicle checked for any damage caused by the water. Probably will find that the ignition (plugs, wires, etc) got wet and triggered a misfire code (P0300). Allow the system to dry thoroughly and when the system detects there is no misfire after a few drive cycles the check engine light will go out.
What is engine code p0300?
Trouble code P0300 means: Random/multiple cylinder misfire detected.
2000 sienna 81thousand hestating after changing plugs with check engine light on?
Must have damaged a spark plug or mixed up the firing order during replacement. Check the code(s) and you may find a P0300 thru P0308 which will help determine what cylinder is misfiring.
98 dodge durango fault codes p0300 p0301 p0302 p0308 p0135 p0171 transmission was just rebuilt engine ran great before mechanic touched it?
last one to touch it is at fault!! take it back & make them fix it.
What to do if car hood was left open in the rain?
Cry. Leave it open for when the sun comes out it will dry faster. Wait for it to dry before you try to start it otherwise it may trip the "check engine" light (P0300 = random misfire) to come on.
What is engine code P300 for 2002 dodge ram 1500?
P0300 multiple cylinder misfire. You need to check plugs, wires, coils, injectors........
Could a tune up and fuel injector clean up have caused a P0300 code and the catalytic converters to go wrong?
i think no, because dtc p0300 comes when the engine misfired detected, engine tune up and injector cleaning are need to perform when this dtc p0300 was set
