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what are the most likely cause for misfire

This is a discussion on what are the most likely cause for misfire within the General Help forums, part of the LSx Technical Help Section category; My car has had the ses light on for some time code 1440 evap emiisions system I changed the gas ...

  1. #1
    Member scotthd's Avatar
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    01 ta red
    95 mustangV6

    what are the most likely cause for misfire

    My car has had the ses light on for some time code 1440 evap emiisions system I changed the gas cap and reset it came back so i ordered a purge solonoid. but the other day my ses started flashing indicating missfire and the code I think was 0300 for misfires... My question is could these be related or should I dig in more..I only have 54,000 on it.

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    Senior Member Orcus79's Avatar
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    black
    2002 WS6

    Miss fire can be caused by many things, anything from a clogged filter some where to a bad sensor. Get a for sure code and that may help diagnose the issue. The 0300 code is multiple missfires I think.

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    Member scotthd's Avatar
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    01 ta red
    95 mustangV6

    that was the description so that must have been the code but do you htink it has anyhing to do with purge solonoid

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    Senior Member Orcus79's Avatar
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    I dunno, it could be. So far I haven't had to diagnose it on my car (02 WS6), and the most likely culpret you don't have, the EGR.

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    Member scotthd's Avatar
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    01 ta red
    95 mustangV6

    thanks for the info.

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    Member danziger's Avatar
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    Le Mans Blue
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    The only time I had a mis-fire code, it turned out to be a faulty spark-plug wire. Sounds obvious, but it happens to a lot of people...

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    Retired NOT tired SteveC's Avatar
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    2001 Z28 (Sara)

    Get it fixed soon, the P0300 will trigger the P1336 code, and then you will need a crank postion relearn.

    SteveC

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    We'll be back... GatorSS's Avatar
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    Most of the time, P0300 code is caused by:
    1) spark plug(s)
    2) spark plug wire(s)

    Before replacing these, check to make sure it's not just a loose plug wire.

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    Member scotthd's Avatar
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    01 ta red
    95 mustangV6

    thats what I figured I changed the evap solonoid today code started flashing again So I ordered new msd wires and ngk 55 plugs... I hope this fixes it Im also putting cat back on this weekend if it arrives soon enough I havent driven since it occured and it first came on down the street from my house... I dont know if this indicates something dif but I can smell alot of fuel in the exhaust right now also

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    Senior Member Orcus79's Avatar
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    you are running rich, so, something isn't metering right, or plugs are not firing, how is performance?

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    Member scotthd's Avatar
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    01 ta red
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    dont know I parked it when the ses flashed...

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Yep usually plugs and plugs wire fix the P0300. Can also be dirty/plugged fuel injectors or bad gasoline.
    P1440 doesn't exist. You either mean P0440 which is EVAP system large leak. That usually sets when you leave the gas cap off or a EVAP hose disconnected.
    Or you have P1441 which is vacuum during a non-purge condition. The purge valve is almost always the cause there.

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    Member scotthd's Avatar
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    01 ta red
    95 mustangV6

    you are right it was a 0440 evap emiss control system malfunction,,I cleared both codes after replacing the solonoid.ran it again this time 305 came up cylinder 5 misfire. runs pretty rough still strong gas smell, I hope plugs and wires do the trick, not looking forward to changing them the passenger side looks pretty tough....

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    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
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    My car threw this code today so was wondering what the solution for yours was. Ive been having a problem of when I tip into the throttle in a low gear my engine detonates and pings. It runs great every other time except "tip in". Plugs are new, wires are a year old..
    GMPP LS6 crate motor,racetronix,Wilwood 6 piston,HID's,200mph speedo,full dynomat, GY F1's,17" Y2K, Alpine audio upgrade,3" ele cutout, LT's, catted-Y, full suspension

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    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    did wires and plugs fix this? i threw the code again today
    but it never flashes

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