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Thread: Rough iddle / engine shaking after wash

  1. #1
    Join Date
    Jun 2014
    Location
    Bandung
    Posts
    50
    My Cars
    1994 E36 320i

    Rough iddle / engine shaking after wash

    Hello bimmer fellows,

    I have problem with my e36 MT 1994. My car sometimes shakes like hell, like some of the plugs are dead after washing the car. Sometimes it happened right after drying and starting the car but sometimes it happened after one or two hours the car was off. The car will run normally after +/- one mile driving. Btw I didnt wash the engine bay, just a normal body wash at home with tap water. What causes the problem? Thank you.
    Last edited by lorensiuswlt; 12-13-2016 at 04:28 AM.

  2. #2
    Join Date
    Oct 2013
    Location
    The Netherlands
    Posts
    686
    My Cars
    2011 E90 325xi
    This issue has been discussed multiple times. Most likely your firewall cover at the left side of the engine bay (passenger side) is failing and letting water through resulting in shorting your modules.

  3. #3
    Join Date
    Jun 2010
    Location
    NY
    Posts
    9,098
    My Cars
    1997 328i
    Could also be your cowl drains that are cloggged, the excess water gets into your DME compartment and fucks with it. You should vacuum out your cowl, fix the drain problem, remove your DME and check both sides of the circuit board for oxidation damage.

  4. #4
    Join Date
    Oct 2010
    Location
    Edgewater, NJ
    Posts
    443
    My Cars
    POS E36
    Check the last 2 spark plug chambers for water and soak it up as needed

  5. #5
    Join Date
    Jun 2014
    Location
    Bandung
    Posts
    50
    My Cars
    1994 E36 320i
    Quote Originally Posted by ultimatetester View Post
    This issue has been discussed multiple times. Most likely your firewall cover at the left side of the engine bay (passenger side) is failing and letting water through resulting in shorting your modules.
    Thank you ultimatetester, i'll try to check that part.

    Quote Originally Posted by Eric93se View Post
    Could also be your cowl drains that are cloggged, the excess water gets into your DME compartment and fucks with it. You should vacuum out your cowl, fix the drain problem, remove your DME and check both sides of the circuit board for oxidation damage.
    Thank you Eric93se, i'll try to check that, maybe some leafs that caused that.

    Quote Originally Posted by n3985 View Post
    Check the last 2 spark plug chambers for water and soak it up as needed
    Thank you n3985; i 'll check the sparks also.

  6. #6
    Join Date
    Jul 2010
    Location
    Murrieta, CA
    Posts
    9,557
    My Cars
    '94 325iC, '08 328i, E93
    You can look into the last two plug wells to see if there is water. If yes then you can pull the plugs and turn the engine over several times to blow the water out. Actually, with one plug removed, the engine will start. Let it run for a few seconds to blow out the water, then move on to the next plug.

    You don't want to take out both plugs then start because while you are taking the second plug out, the water in the first cylinder will be draining into the oil -- this is undesirable. Take a plug out and start the engine. The water that falls in will be blown out of the open spark plug hole. Repeat for the second spark plug.

    The $64,000 question is, why is there water in the spark plug wells? The engine cover should prevent this. Not to mention, the hood should prevent it. If the act of washing the car fills the plug wells with water, then driving in the rain will do the same. If your washing the car with the hood raised, this is a bad plan that you should not be repeating.

  7. #7
    Join Date
    Jun 2014
    Location
    Bandung
    Posts
    50
    My Cars
    1994 E36 320i
    Quote Originally Posted by JDStrickland View Post
    You can look into the last two plug wells to see if there is water. If yes then you can pull the plugs and turn the engine over several times to blow the water out. Actually, with one plug removed, the engine will start. Let it run for a few seconds to blow out the water, then move on to the next plug.

    You don't want to take out both plugs then start because while you are taking the second plug out, the water in the first cylinder will be draining into the oil -- this is undesirable. Take a plug out and start the engine. The water that falls in will be blown out of the open spark plug hole. Repeat for the second spark plug.
    Thanks JDStrickland. I will check the last two plugs and cowl drain for the possible causes.

    The $64,000 question is, why is there water in the spark plug wells? The engine cover should prevent this. Not to mention, the hood should prevent it. If the act of washing the car fills the plug wells with water, then driving in the rain will do the same. If your washing the car with the hood raised, this is a bad plan that you should not be repeating.
    LOL..i never do that, maybe that was caused by clogged cowl drain

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