Misfire cylinder 1

Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    JK Newbie BulldogMJP's Avatar
    Join Date
    May 2012
    Location
    Toronto
    Posts
    90

    Default Misfire cylinder 1

    So It's gone real cold up here in Toronto and I've noticed the Jeep (2007) feeling sluggish and shaky. At idle you can feel the Jeep shaking. Now today the problem got worse, engine light flashing and no power. Managed to limp home the 2 clicks. The rattling coming from the drivetrain once under power is horrible. I ran the diagnostic on the superchips and it came back with a code 305 misfire cylinder 1. Now I'm at a loss as what to check on this thing. Do I just limp it round the corner to Chrysler or are there things I should check first? :(

  2. #2
    JK Enthusiast kgonzalez's Avatar
    Join Date
    Oct 2012
    Location
    Pensacola
    Posts
    262

    Default

    Have you checked spark plugs and/or wires? Could be time for a quick easy fix.

  3. #3
    JK Jedi Master ronjenx's Avatar
    Join Date
    Feb 2008
    Location
    Maine
    Posts
    10,554

    Default

    Any chance you have the lifetime powertrain warranty?

    Below is a list of possible causes for P0305, #5 misfire.
    Some of the items have a long list of things to check.

    Possible Causes
    ASD RELAY OUTPUT CIRCUIT
    INJECTOR 5 CONTROL CIRCUIT
    COIL CONTROL 2 CIRCUIT
    IGNITION WIRE
    SPARK PLUG
    IGNITION COIL
    FUEL PUMP INLET STRAINER PLUGGED
    RESTRICTED FUEL SUPPLY LINE
    FUEL PUMP MODULE
    FUEL PRESSURE LEAK DOWN
    FUEL INJECTOR
    ENGINE MECHANICAL
    POWERTRAIN CONTROL MODULE (PCM)
    08 Rubicon Unlimited
    Auto Transmission

  4. #4
    JK Newbie BulldogMJP's Avatar
    Join Date
    May 2012
    Location
    Toronto
    Posts
    90

    Default

    Wires look good. Nothing loose. Will check plugs tomorrow. Just wondering why the cold weather would bring this problem to light. Jeep was running great til this cold snap. May be a coincidence. Flashpaq def said cylinder 1 was the culprit. I'll double check the code.

  5. #5
    JK Newbie
    Join Date
    Mar 2009
    Location
    Baltimore, Maryland
    Posts
    31

    Default

    Had same problem. I went to take offending wire off, and it pulled right off leaving the connector on spark plug wires. Replaced wires and plugs and it fixed the problem

  6. #6
    JK Super Freak JKingAround's Avatar
    Join Date
    May 2012
    Location
    Grant Florida
    Posts
    1,347

    Default

    I had a similar problem and it ended up being my computer. I would check plugs, wires, coil and computer in that order.

  7. #7
    JK Newbie PLOTTHOUND's Avatar
    Join Date
    Aug 2012
    Location
    Madison, NC
    Posts
    42

    Default

    Depending on how old the plugs and wires are id go ahead and spend the money to replace 'em and see if that fixes the problem. In fact you could just swap the wire for another wire on the engine and see if that cylinder misfires instead. I don't know what type of wire you have or how many miles are on them but the carbon core wires tend to wear out on the inside where you can't see. Hope this helps...
    2007 JK X
    295/65R18 on ProComps
    Currently fenderless and loving it!

  8. #8
    JK Enthusiast MoveRight's Avatar
    Join Date
    Oct 2010
    Location
    Greenville, SC
    Posts
    155

    Default

    Same issue with mine (2010 with 27k miles). Plug failed. As stated, I'd start with plugs and wires first.
    2014 JKU Rubicon Bright White
    2010 JKU Rubicon Black
    2008 JKU Rubicon Flame Red
    1974 CJ5 Renegade Blue

  9. #9
    JK Freak
    Join Date
    Nov 2006
    Location
    Riverton, Utah
    Posts
    964

    Default

    My misfire was plugs or wires too. I am forgetting how many miles it was but I think it was 35-40k.
    Bryan

    07 Jeep JK Wrangler X 4dr Greystone, 35x12.50r15 MTR/K, Evo 3" Plushride, Rancho RS9000XL

  10. #10
    JK Newbie BulldogMJP's Avatar
    Join Date
    May 2012
    Location
    Toronto
    Posts
    90

    Default

    Pretty sure wires and plugs have less than 15000km on them. I'll look over po receipts. I'll swap wire over to different plug and see what code comes up. If it still shows miss in #1then does that point issue towards the Spark plug.

  11. Default JK-Forum


Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •