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Multiple cylinders misfiring on 2000 hyundai elantra gls

OBD'' codes showed P0300, multiple cylinders misfiring. How do I repair the cylinders?

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How can you be sure its the cylinders? maybe your spark plugs are worn and need to be changed?

Posted on May 08, 2017

  • Anonymous May 08, 2017

    We plugged a code reader into the car & it showed 5 diagnostic codes, 1 of them showing P0300 Multiple Cylinder Misfire.

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How do I repair misfiring cylinders?


Hi, maybe you take a look at your spark plugs, it could be that they are worn and need replacement.

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Repair the code issue, because your Villager has OBD-II which is a very helpful Diagnostic system. Upvote (4) ... My 1999 Villager was running poorly; rough idle, lack of power at highway speeds and the engine problem light indicated random miss-fire, etc. I had new spark ... Have code po306 cylinder 6 misfire detected.

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Not much.
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1 Answer

Multiple cylinder misfire detected. P0300


No Vehicle
No Motor
No Problems described

Google your codes

Type: OBD PO300

Have a repair shop diagnose the cylinder misfires,
if you can't put a sentence together for a proper question
with details & why you ask,if your off to a repair shop anyway

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1 Answer

Engine light comes on - Code shows P0300 and then


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When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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1 Answer

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