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Thread: E36 316i -> 318is (m42b18) low idle and stalling - tried almost everything

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    Join Date
    Mar 2021
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    Amsterdam, Netherlands
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    My Cars
    E36 316i -> 318is

    Question E36 316i -> 318is (m42b18) low idle and stalling - tried almost everything

    Hello everybody,

    Over the past months I have done an engine swap on my first ever car: swapping my E36 316i to a 318is (m42b18).
    Although the car starts up nicely, after about 15 seconds the idle drop to about 400 rpm, it runs rough and if I press the gas pedal it stalls. Currently I really have no idea what this could be because this is what I have tried so far:


    • Cleaning the ICV (also swapped it for another one which I cleaned too, no dice)
    • unplugged the MAF (this made the car idle higher, but it still displayed the same symptoms)
    • Had a friendly garage perform a smoke test (no significant leaks were found)
    • installed a new PCV
    • new NGK plugs
    • measured the plug wires, all at 5K Ohms
    • swapped the ignition coil for the one from my m43b16
    • swapped the crank- and camsensors
    • installed a new fuel pump (fuel filter is about 6 months old)
    • swapped the DME for the one from my m43b16
    • swapped the TPS for the one from my m43b16
    • the o2 sensor is new


    Since the car is European I can't perform a stomp test and a Snap-On scanner I borrowed couldn't communicate with the car (even though it has done so succesfully before the engine swap, which is why I swapped DMEs, but this made no difference)

    I'm completely stuck and since this is my only car I would really like to get it back on the road, so the tremendous expertise of this forum is very welcome.

    Here is a video of the car's behavior: https://youtu.be/mO8FhWX9nY8
    It idles fine at first and responds to the throttle well (@ 0:19), then at 1:02 it starts to idle rough and hesitate when I press the gas.

    Thank you all so much in advance!

    Kind regards,
    Toine
    Last edited by asmvis; 03-19-2021 at 03:54 PM.

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