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Thread: 3.0 CSL enging racing

  1. #1
    Join Date
    Dec 2008
    Location
    Scottsdale Arizona
    Posts
    343
    My Cars
    540iT 840Ci 850Ci 540i

    3.0 CSL enging racing

    My friend has a mint 1973 3.0 CSL and recently it started this problem.....
    start up fine, but while motor is still cool, and stopped at a traffic light, the motor races and the revs cycle up and down.
    After the motor warms, the problem ALMOST goes away......still sometimes the motor races after coming to a stop.
    just to try something, we pulled the plug off of the cold start injector (csi)..........now from cold, the motor is hard to start (as you would expect) but the racing problem is completely gone.
    I'm just throwing out idea's here, I'm no expert on this, but I would think that there might be a temperature sensor somewhere that tells the ECU that it is cold enough so that it needs to activate the cold start injector (csi)? could this temp sensor be braking down and sending a false signal to the csi sometimes, which would send EXTRA gas into the motor and cause the racing?.......could the CSI be leaking and causing a rich mixture sometimes?
    Since this is a 3.0 CSL car, it comes with a different motor and/or components to the 3.0 CSi
    Does this make sense to anyone? Any idea's??

  2. #2
    Join Date
    Aug 2008
    Location
    Sydney Australa
    Posts
    2,482
    My Cars
    1x633, 1x E3 2 DR Racer
    It could be a number of things, but considering mint E9 CSL's are selling from $150k to $250k, and even more, he should take it to a specialist rather than trying to fix it himself based on advice from a web community forum.
    1977 633 CSi RHD Euro. S38B38 3.9L M5 Transplant. 5 Speed Getrag Dogleg. 3.73 LSD. 417hp, 369lb/ft
    1971 3.0CS E3 2dr Alpina Special Coupe Racer, 347hp, 295lb/ft

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