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Spark Plug Gap 200 1993

posted by  someone claiming to be Jay Stark on  Sat Dec 8 13:40 CST 2001 [RELATED]

Hello all,

I've ordered the Bentley Blue Bible from Amazon & am anxiously awaiting its arrival; in the meantime, what is the correct spark plug gap for a '93 240? I bought Bosch platinum plugs (WR7DP) but still need to get wires, distributor & rotor. The car runs fine. It has 176K miles on it and I've only owned it about a year and a half and have no idea when all these were last replaced. Does anyone have any remcommendations as far as what brand they would recommend? Also, I've read different opinions regarding to apply or not to apply anti-seize to the plugs. Should I or shouldn't I use anti-seize? Thanks!







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    Re: Spark Plug Gap 200 1993

    posted by  someone claiming to be Haroon on  Sat Dec 8 16:45 CST 2001 [RELATED]

    it's .028 in. Recheck the gap on the plugs, mine were gapped at .032-.035.

    Also change the plugs on a cold motor, light tab of anti sieze and torque them to specs (see owners manual).

    Change the cap and rotor, wires (bosch) and take a look at the engine codes to make sure everything is fine.







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    Re: Spark Plug Gap 200 1993

    posted by  someone claiming to be Michael on  Sat Dec 8 16:45 CST 2001 [RELATED]

    I agree with the other response. I just installed a set of NGK plugs, and I checked the gap on all of them. Right on what they should be. Gap should be 0.028" - 0.032", or 0.7mm - 0.8mm.







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    Re: Spark Plug Gap 200 1993

    posted by  someone claiming to be Jerry Warren on  Sat Dec 8 13:52 CST 2001 [RELATED]

    Just install the plugs, their already gapped. Every plug I ever checked was right on the money. Go ahead and use antiseize it won't hurt.

    You should be able to look at the rotor and cap and get an idea whether they need to be replaced. Is there pitting on the contacts in the cap, if so replace it, if not it doesn't need to be replaced. The same for the rotor. What does the end of the rotor look like? Same applies if pitted then replaced, if not wait awhile. Wires, check the resistance with a DVM(digital volt meter)and see what the resistance is on each wire. If the resistance is similar then why change unless there are breaks on the outside of the wire.

    Wires, cap and rotor a good parts store should have what you need.







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      Re: Spark Plug Gap 200 1993

      posted by  someone claiming to be dennis on  Sat Dec 8 18:20 CST 2001 [RELATED]

      Jerry,

      i have to disagree with your assumption that just because the spark plug wire resistance readings with a digital voltmeter is the same for each wire that there is no reason to change the wires.

      The digital voltmeter only reads the resistance of the current carrying conductor. It can not tell you the "insulation resistance". This parameter is just as (or more) important than the conductor resistance reading. There is a device that can measure insulation resistance, but it is far less expensive and more practical to replace the wires.

      Due to age, the constant exposure to heat of the engine, the high voltages the spark is delivered at, etc..I change my plug wires every two years, and would suggest it anytime there is an unexplainable loss of power.







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        Re: Spark Plug Gap 200 1993

        posted by  someone claiming to be Jerry Warren on  Sun Dec 9 07:45 CST 2001 [RELATED]

        Point well taken. I do use the night method to see if any there are any leaks. I only change my wires when I detect some sort or problem. I have use the resistance measurement with success as I have found two wires that were drastically different from the rest and changed them and corrected the problem.






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