Misfire issue?
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Misfire issue? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I have a 2007 CTS 2.8L. It has trouble with a slight uphill when it has just started up, with ...
  1. #1
    Acake is offline Cadillac Owners Member
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    Misfire issue?

    I have a 2007 CTS 2.8L. It has trouble with a slight uphill when it has just started up, with the engine feeling rough and very hesitant. It also jerks randomly, usually at low RPM, and especially when the AC is on, but is does do it when the climate control is off. I got an engine light and the codes were P0300, P0301, and P0346, the light went away a few days later. I'm thinking it could be a fouled plug, or perhaps the coil pack. Any ideas?

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  3. #2
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 Cadillac CTS 3.6 Sport Luxury
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    Re: Misfire issue?

    P0346 relates to a camshaft position Sensor A Bank 2, which would probably cause missfire if the sensor is not operating correctly as it wont be sending the correct data to the ECM
    First think I would have checked is your battery, then check your oil levels, if that is good then a bad camshaft sensor would cause loss of power and eventually stalling.
    If both the battery and oil are good I would replace the cam sensor that is throwing the code, they are not overly expensive.

  4. #3
    Calvin_Z is offline Cadillac Owners Member
    Automobile(s): CTS
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    Re: Misfire issue?

    I've had the 0300 and 0301 and it was the ECM. But like CTSUK said, pick off the low hanging fruit first. Plugs, battery, sensor and coil are a good place to start.

  5. #4
    Acake is offline Cadillac Owners Member
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    Re: Misfire issue?

    How involved is the process to take off the upper manifold to access the coils and plugs? Has anyone posted a good how to on this? Also, does anyone know where I can download a service manual for my car?

  6. #5
    erdoc48 is offline Cadillac Owners Fanatic
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  7. #6
    Acake is offline Cadillac Owners Member
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    Re: Misfire issue?

    Thank you for the link, and to all of you for the advice. I replaced the coil and the plug on the #1 cylinder, the gap on the plug was way off (.062). Also, ther was a little drop of engine oil around the top of the plug (above the threaded part) before I removed it. Do yout think this was significant? I am re-assembling everything now. I'll let you know how it goes. If this doesn't resolve it The camshaft position scensor for this side is next. My mechanic seemed to think that a bad plug or coil could cause the P0346 code, and it may not be malfunctioning. I have to say, it feels good to be doing this myself, with all the help from you lovely people of course!

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