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Thread: M30 535i running rich at idle cuts out under load

  1. #1
    Join Date
    Jan 2017
    Location
    Maine
    Posts
    3
    My Cars
    1988 bmw 320i

    M30 535i running rich at idle cuts out under load

    Trying to figure out what's going on, when you first start the car the afr is right about where it should be a slowly drops all the way down to 10.0. It cuts out under load but revs freely while not.

    I've replaced
    Ignition coil
    Cap and rotor
    Plugs and wires
    Fpr
    Coolant temp sensor
    Fuel pump and filter (pump was junk when I bought it)

    Fuel pressure is at 35 and spikes to 40 when revved (didn't think to test it underload while i had the pressure tester) The motor is boosted with a setup from a 7 series. Bought the car not running, got it going and ran decent but broke up a little in the higher rpms. Now it won't pull well at all. It's all swapped into a 88 320i wagon and definitely isn't the cleanest swap but couldn't turn it down for the price.

    Any idea what to check next?

    - - - Updated - - -

    Seems to be leaning out when accelerating

  2. #2
    Join Date
    Mar 2014
    Location
    Quezon City, Philippines
    Posts
    636
    My Cars
    '89 535i/5, '88 735i/5
    Tps?

  3. #3
    Join Date
    Jan 2017
    Location
    Maine
    Posts
    3
    My Cars
    1988 bmw 320i
    Was going to try that next, I ohm tested it and got the click and proper resistance at idle but no reading at wot.

  4. #4
    Join Date
    Jan 2017
    Location
    Maine
    Posts
    3
    My Cars
    1988 bmw 320i
    Any other ideas? Haven't worked on it in a while due to snow, just ordered a tps to see if that fixes the issue. Snows starting to melt and want to get it out on the road.

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