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Rough idle at 1000 rpm

Discussion in 'PT Cruiser' started by Brenda, Nov 2, 2016.

  1. Alan Knodle

    Alan Knodle New Member

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    1
    Another thing that can cause cold engine stumble and roughness is carbon build up on the back side of the intake valves.
     
    Brenda likes this.
  2. Gerry G

    Gerry G Member

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    89
    It sounds to me the incorrect type of plug was used 2 years ago for the gap to have eroded from .40 (40 thousandths) to .46 (46 thousandths) in 10,000 miles. Hopefully they used the proper copper Champion/NGK or a double-platinum Champion/NGK or you may be replacing them again in 2 years. If they used the copper plug it should be replaced in 30,000 miles. The double-platinum should be replaced in 60,000 miles. Plan on a spark plug wire change next time the plugs are replaced.
     
    Brenda likes this.