PT "missing" at idle...

Discussion in 'PT Cruiser' started by BREWERPAUL, Nov 21, 2004.



    Hi-- My '03 Cruiser with 18K miles seems to be missfiring at idle when warmed
    up. It'll be running smoothly, then it will miss . Usually it's only one miss,
    but sometimes there will be two or even three in a row. While waiting at the
    average traffic light, this might happen several times. The car runs fine while
    actually driving.
    It may or may not be related, but in the past several weeks I've had a hard
    time starting the car first thing in the morning. Most days it's fine, but
    about 3 times I've really had to crank it for a LONG time before the engine
    caught. Nights are getting cooler in upstate NY, but not really cold yet (30's
    The dealer tells me there is a TSB calling for a different type of plug and new
    plug wires. Think this will fix both problems? FWIW-- on separate occasions
    they've already replaced two plugs on this relatively low mileage car...

    Got wood?
    Check out my exotic hardwood pennywhistles at fair
    BREWERPAUL, Nov 21, 2004
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    maxpower Guest

    You should post what yr your vehicle is if you want to know about the latest
    TSB's, but that is what is sounds like to me, replace the plugs and wires,
    Normally the check engine lite will turn on with a cyl misfire code. But i
    have run into this many times when the vehicle is misfiring and no codes are
    set and the monitor doesnt even let you see it misfiring.
    Glenn Beasley
    Chrysler Tech
    maxpower, Nov 21, 2004
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    SRG Guest

    The OEM wires haven't had the best history, I've heard some PT owners having
    ignition problems getting them replaced under warranty. Also, at 18k miles
    you might want to replace the full set of spark plugs, yeah I know you had 2
    done already, but it might be worth it.

    SRG, Nov 21, 2004

    pottsy Guest


    had the same thing on the '04 Cruiser, after changing the cat (still
    missing) the dealer then changed the plugs and the problem mostly went away
    (the engine still occasionally takes time to "wake up" after overrun i.e. no
    immediate throttle response, the dealer said this was the fuel computer
    resetting itself (?) and is normal. Needless to say the dealer doesn't get
    the regular service work.

    the engine check idiot light never came on.

    the dealer did say that the standard plugs were a known fault and that
    japanese plugs performed much better in this engine.

    pottsy, Nov 21, 2004

    maxpower Guest

    hmm you did post the yr, my bad!! where was i at?
    maxpower, Nov 21, 2004


    Forgot that: it's an '03

    Got wood?
    Check out my exotic hardwood pennywhistles at fair
    BREWERPAUL, Nov 21, 2004


    Where was I at too? I believed you and reposted the year. Guess both of our
    brains are misfiring too... :)

    Got wood?
    Check out my exotic hardwood pennywhistles at fair
    BREWERPAUL, Nov 21, 2004

    Punch Guest

    sounds like you've been taken for a ride, why change the cat due to an idle
    problem, and I hope it was under warranty, also what is a fuel control
    Punch, Nov 21, 2004

    maxpower Guest

    The TSB for the plug wires and plugs was for the 2004 PT but if you are
    still under 3/36 the wires will be covered
    maxpower, Nov 21, 2004

    TOM KAN PA Guest

    I have a 2001. I just had my mechanic change the plugs at 30,000. His labor
    charge was $45, the dealer wanted $115. Was there a SB stating that the plugs
    in the 2001 causing a problem?
    The dealer also wanted $75 to change the power steering fluid.
    I opted out on this seeing that I couldn't find this reccomended service in the
    owner's manual at any mileage.
    TOM KAN PA, Nov 21, 2004

    Bill Putney Guest

    Is it possible that a throttle body cleaning would remedy this problem?

    Bill Putney
    (To reply by e-mail, replace the last letter of the alphabet in my
    adddress with the letter 'x')
    Bill Putney, Nov 22, 2004
  12. Probably not. Dirty throttle bodies generally cause poor driveability and
    stalling upon near-zero-speed deceleration, but not idle misfire.
    Daniel J. Stern, Nov 22, 2004

    Mike Behnke Guest

    Crank or cam sensor. Friends PT was doing same thing. Crank sensor
    fixed problem.
    Mike Behnke, Nov 22, 2004
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