Po303 misfiring, power loss, and rough low rpm - Mitsubishi Forum - Mitsubishi Enthusiast Forums


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Old 04-19-2008, 04:06 AM
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Default Po303 misfiring, power loss, and rough low rpm

Greetings,

I am hoping that someone can help me with the diagnosis of my 1999 Mitsubishi Eclipse GSX.

OBDII reports diagnostic code Po303 - misfire in cylinder 3
Fairly smooth at idle and high revving when out of gear
Revving is always rough at low portion of rpm curve
Misfiring at low rpms when in or out of gear
Rough with power loss when in gear, especially under load or with heavy throttle (from start, uphill, or when floored)
Will drive almost normally if I'm _very_ gentle with the gas pedal
Flooring it when in gear results in deep low tone, rough vibration, and flabby power

Can anyone make a suggestion based on my symptoms?

Thanks!
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  #2  
Old 04-19-2008, 08:34 AM
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Default RE: Po303 misfiring, power loss, and rough low rpm

change your spark plugs and wires and that will probably fix the issue
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Old 04-20-2008, 12:03 AM
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Default RE: Po303 misfiring, power loss, and rough low rpm

Any idea whether it could be a fuel injector?
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Old 04-20-2008, 05:41 AM
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Default RE: Po303 misfiring, power loss, and rough low rpm

not really... its either that or the coil pack... trust the engineer

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Old 04-20-2008, 08:43 AM
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Default RE: Po303 misfiring, power loss, and rough low rpm

Injectors and coilsusually aren't a parts that fail often, listen to TE and change your plugs and wires.
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Old 04-20-2008, 09:01 AM
 
Join Date: Aug 2005
Location: Baraboo, WI
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Default RE: Po303 misfiring, power loss, and rough low rpm

I had the same thing.. Except it was misfire on cylinder 1.. Ended up being the spark plug wires.
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Old 04-20-2008, 01:46 PM
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Default RE: Po303 misfiring, power loss, and rough low rpm

Great! I already ordered plugs and wires, but just wanted to make sure in case other parts might be necessary.
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Old 04-20-2008, 06:39 PM
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Default RE: Po303 misfiring, power loss, and rough low rpm

And the winner is... Spark plug wire #3

Changing plugs and wires solved the problem. Thanks!
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Old 04-20-2008, 07:43 PM
 
Join Date: May 2006
Location: Marshall, TX
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Default RE: Po303 misfiring, power loss, and rough low rpm

yeah i had the problem of oil getting into my number 2 cylinder due to a torn sparkplug boot, andwas causing a bad misfire, so finally i replaced the wires, cleaned the oil, ran like a champ.
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Old 04-20-2008, 08:04 PM
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Default RE: Po303 misfiring, power loss, and rough low rpm

glad to hear it.
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2001, 420a, 6, cyl6, eclipse, galant, loses, misfire, mitsubishi, montero, po303, power, rough, runs, sport, uphill

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