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Thread: running on five cylinders

  1. #1
    Tophu530 Tophu530's Avatar
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    Jul 2009

    Default running on five cylinders

    Ive had my 240z running now for around a year now and it has been doing pretty well. I have a L28 currently and within the past week i noticed a lack of power, more exhaust fumes coming into the car and it was running roughly. The first thing I did was pull each spark plug out to see a change in rpm and Ive concluded that when I remove the #1 spark plug closest to the front of the car there is no change at all. I checked and saw that there was a spark jump, and I looked at the spark plug and it didn't look too bad. my head gasket has been leaking a little since i put the engine in which was probably a year or less ago. could that have anything to do with it. Any help would be much appreciated so i don't have to take it into a shop and pay lots of cash.

  2. #2
    Registered User Gary in NJ's Avatar
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    Mar 2010
    Amongst the twisty roads


    Is the number 1 spark plug fuel fouled or oil fouled?

    If it's neither, you're not getting fuel which could be the result of a tight valve. Time for a compression check and a look at the valve lash.
    Guardian of HLS30-91415
    Previous Owner of a 10/70 240Z ('83-'85)

  3. #3
    Registered User
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    Jul 2010
    Phoenix, Az


    is this fuel injected or carburated. had the same issue recently with mine. the result was no fuel, aka bad injecter.

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