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Thread: Yet another Cold Start Thread ‘00 2.8 M52TU

  1. #1
    Join Date
    Sep 2012
    Location
    Nebraska
    Posts
    107
    My Cars
    1998 M Roadster,'07 328i

    Yet another Cold Start Thread ‘00 2.8 M52TU

    Hi All-

    I’ve been using the search function and finding lots of threads on cold starts, but none of them seem to address the situation I am having.

    Ever since it’s gotten cold here in Nebraska, my ‘00 2.8 starts really horribly. It will crank and try to fire and then stumble and die. I usually have to try it 3 or 4 times before it starts. I usually press the accelerator as well (channeling my carbureted days) and I’m not sure if that helps or not. After it starts, it runs and idles fine, and starts again when it’s warmed up. But if it sits overnight <40deg, it will hard start.

    What I have done so far:
    —VANOS kit was done last year, because it did start hard in the cold, that was a VANOS seal symptom. (The cold starts at that time weren’t real bad, just a slight stumble on the first crank)
    —I bought a fuel pressure tester at HF. Pressure reads 0psi after sitting overnight, but as soon as I turn the key on, it jumps up to about 50psi. I have tried to remember to turn the key on for at least 5 seconds to get the fuel pressure up before starting, and it doesn’t seem to help.
    —Spark plugs were replaced last year with OEM model.
    Edited to add:
    —I did a bottle of ISO-HEET on the last tank, and a bottle of Techron on this tank.


    The CEL does not come on, but I will check codes with INPA later today.

    PO replaced ICV about 3 years ago, but used a cheap AutoZone part.

    I was going to order an OEM ICV, unless somebody has any other ideas of things to check?

    Thanks all!!

    Mitch
    Last edited by sydjai; 11-29-2020 at 06:05 PM.

  2. #2
    Join Date
    Feb 2016
    Location
    tempe, az
    Posts
    2,695
    My Cars
    1998 Z3M, 2006 330i
    The first thing you have to do is pump the gas pedal many times, causing the accelerator pump to put lots of gas in there, if you are "channeling"...... I may be of no help here, but I'll offer something quick and easy to try. I would guess fuel pressure could be the problem. You seem to know what you're doing, so you may know that the fuel pump only operates a few seconds if you don't start the car. Maybe your "3 or 4 times", is giving it enough time to get fuel to the injectors. So, I would turn on the key for about 10-15 seconds, without starting the car, several times ... before trying to start the car. If that helps at all, then your fuel pressure is leaking down while the car sits overnight.

  3. #3
    Join Date
    Sep 2018
    Location
    Houston, TX, USA
    Posts
    1,064
    My Cars
    1999 BMW Z3 Coupe 2.8
    ICV does seem suspect...

    I'd def pull codes first thing.

    I like zellamay's suggestion as a test. If building fuel pressure helps, then you can focus on fuel pressure...

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