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Thread: 95 525i Spark Plug choices

  1. #1
    Join Date
    Oct 2014
    Location
    Oakland CA area
    Posts
    12

    Default 95 525i Spark Plug choices

    1995 525i Manual, Black, silver interior, 164K miles. What spark plugs to use? The Bentley manual specifies spark plugs as Bosch F7 L DCR, but the Owner's Manual says Bosch F8 L DCR - which, according to Bosch's website, is one notch "hotter" than the F7. Meanwhile, I have seen plenty of old posts that say to use NGK BKR6EK. Why do I care? Just misses passing Calif. smog for HC at 15 mph on the dyno (passes at 25 mph). CO and NOX are fine. Already replaced fuel pump, filter and pressure regulator, as I am sure they were original (filter was really nasty inside the dirty side - yikes!). Still just barely over that HC limit at 15 mph, but starts and runs great. Plugs are not very old but figure new ones can't hurt, and have been told it's a good idea to replace the coil boots at the same time (I am sure they are original, so I agree). Anyway, what's up with spark plug choices? Gotta pass smog to drive the next 2 years!

  2. #2
    Join Date
    Jan 2004
    Location
    So.Calif ( L.A. Beach Area)
    Posts
    495

    Default

    was your car warmed up when you went to the test? ...hot enough the catalytic converter was ticking and I always use minimal fuel in the tank too.
    Is you car chipped?
    I have a Mark D chip and mine runs so clean the test guy says they are going to come and test his machine...LOL

  3. #3
    Join Date
    Oct 2014
    Location
    Oakland CA area
    Posts
    12

    Default

    Quote Originally Posted by califblue View Post
    was your car warmed up when you went to the test? ...hot enough the catalytic converter was ticking and I always use minimal fuel in the tank too.
    Is you car chipped?
    I have a Mark D chip and mine runs so clean the test guy says they are going to come and test his machine...LOL
    Thanks for the response! Yes I had driven 40 miles at highway speed; car waited about 8 or 10 minutes before he started testing. Aftermarket cat with only about 3K miles on it. Premium fuel about half tank. The car is stock, not chipped. This was the second time it just barely failed - the first time I thought perhaps I just had not driven the car enough after re-connecting the battery (for the computer to get the fuel trim right), but then I also replaced the fuel pump, filter and pressure regulator prior to this re-test. Afterwards talked with an indie shop guy who suggested NGK plugs and new coil boots - I had not considered chip; was not sure that was OK in Calif.

  4. #4
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,913

    Default

    i like the bkr6ek's more then the f7ldcr's. aftermarket cats are that great for the record
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  5. #5
    Join Date
    Oct 2014
    Location
    Oakland CA area
    Posts
    12

    Default

    Seems as if the NGKs get more votes all right - thanks for that. And yeah the aftermarket cat might not last as long as I would like - yet it buys me some time (I hope) to fix other stuff - drivers window, a/c, radio. Already did suspension, head gasket, transmission (I had blown 2nd gear). Typical big-project (for me) stuff.

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