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  1. #1
    Junior Member One Ring
    Join Date
    May 30 2019
    AZ Member #
    487988
    Location
    Iowa

    What does it mean if there is oil on the spark plugs?

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    The car threw and engine speed sensor and when I went to check the engine there was oil on the spark plugs

  2. #2
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    It means your spark plugs are oily.

    J/K. It just means your valve cover gasket is leaking. Part of that gasket seals the top of the spark plug tubes. Very common.

    You should replace the gasket. After replacement (or during, your choice) you simply remove each spark plug, clean it well. You can wash the residual oil in the tube down the hole into the combustion chamber using Brake Parts Cleaner. If the amount of oil is ridiculous (like, the entire tube is full) then try to soak up as much as you can with some paper towels first, before you remove the spark plugs. After doing this, the exhaust upon first startup will be quite smoky as the oil/brake clean mixture burns off. This is normal.
    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, 4.11 Final Drive, APR 93, 2.5" Exhaust, ST Coilovers, 034 RSB, A8 Brakes Front & Rear
    2006 Passion Red Volvo V50 T5 AWD 6MT
    2000 Satin Silver Passat 1.8T FWD Wagon, Slippy Tiptronic, 15" Hubcaps
    2001 Aluminum Silver Metallic A4 Avant 1.8TQM (winter sled)

  3. #3
    Veteran Member Four Rings q5 dave's Avatar
    Join Date
    Dec 15 2014
    AZ Member #
    303164
    My Garage
    2016 F250, 2018 Q3
    Location
    driving

    Replace valve cover gasket. Super easy just got it done a few weeks ago. While your in there might as well replace half moon cam chain tensioner gasket as well.

    Have a few shop towels and cans of brake clean.









    Sent from my iPhone using Tapatalk
    2013 Q5 3.0T Phantom Black
    1998 A4 1.8T Laser Red, Quattro, 5 speed manual

  4. #4
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    I actually just did a VC gasket and Cam Chain Adjuster gasket/half moon the other day.

    Top Tip, Turn the Intake Cam backwards a bit to get all your chain slack up top. Makes it much easier to clean out the half moon and gasket area. I used a bungee strap to hold it.



    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, 4.11 Final Drive, APR 93, 2.5" Exhaust, ST Coilovers, 034 RSB, A8 Brakes Front & Rear
    2006 Passion Red Volvo V50 T5 AWD 6MT
    2000 Satin Silver Passat 1.8T FWD Wagon, Slippy Tiptronic, 15" Hubcaps
    2001 Aluminum Silver Metallic A4 Avant 1.8TQM (winter sled)

  5. #5
    Established Member Two Rings
    Join Date
    Apr 19 2022
    AZ Member #
    692522
    My Garage
    Cactus Green '99 A4 Avant TQMS Project, '00 E39 BMW 540i6
    Location
    New England

    Engine speed sensor can either be the cam position sensor(s) (2.7TT, 2.8 or 1.8T) or the crank pos sensors. I had a CRANK sensor connector that was shorting out and it was causing the car to throw a CAM sensor code.

    Can be a lot of things.

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