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Spark plugs burning normal?

Discussion in 'The Garage' started by 90blzr, Nov 3, 2003.

  1. 90blzr

    90blzr 1/2 ton status

    Mar 25, 2001
    Likes Received:
    SO CAL
    I just picked up a 1991 V3500 Crew Cab, and checked all of the plugs...all look the same, but are white more than the tan. Is this normal with Fuel Injection? Or is it running lean for some reason? I know the carbed motors are burning good when the plugs show light brown/tan....but not sure if that is the case with the FI as well.
    Anyone know? Thanks/forums/images/graemlins/thumb.gif
  2. Thunder

    Thunder 3/4 ton status

    Jul 20, 2000
    Likes Received:
    Northeast Nevada
    Whitish colored plugs are pretty normal for FI. FI burns a lot cleaner than a carb and because the fuel can be precisly meetered it tends to run leaner. I would not worry about it unless you are getting pre-detonation problems (pinging)
    Even though they may have 20K or more miles on them.My plugs on my TBI Blazer usually look almost like new when I change them out.

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