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engine wont rev , hesitation HELP!

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    engine wont rev , hesitation HELP!

    Hello there!
    I've got a BMW 320i E36, (i know it is not an E30 but if you can please help me out tho) , which has an m52tub28 engine from a 728i E38 Auto. After starting the car the it idles fine.When pushing the accelerator , even flooring it , the revs go up to 2.5-3k then instantly start to drop down even tho I did not release the throttle. While driving I cant accelerate with the car at all, whenever I try to apply gas the car starts jump like it wants to stall but I was able to put it in gear and get driven by the idle. In the following video you can see how the car reacts to throttle in standstill. It is worse when I'm driving , like when trying to take off , it wont even rev past 1.5k and it all acts like it wants to stall. The car currently has no starter in it , when I was testing out things we started the car by pushing. I am going to install back the starter shortly and after it I really want to work this issue out. In the past I ran out of fuel with the car 2-3 times because the indicator shows more than there is in the tank and without knowing what the issue was I tried to start it up several times. Maybe I burned out the fuel pump? I am almost sure there are some vacuum leaks but the car ran just fine before so the vacuum leaks may not have caused this. We put the car to a tester and it gave the following errors: ABS,O2 sensor,Throttle pedal position sensor(I'm not sure what this means since the car has mechanic throttle ) , Multifunctional steering Wheel(the 7 series most likely had it, this one doesn't) , autotesting module (?).

    Here is a video I made of what is exactly happening:
    https://www.youtube.com/watch?v=tGc2m2J4uhw

    PLEASE HELP! write down any ideas you can come up with ! I didn't find anything like this on the internet , I hope someone else already had the same problem as I'm having!

    Thank you in advance! Have a great day !

    #2
    Originally posted by arnee1224 View Post
    Hello there!
    I've got a BMW 320i E36, (i know it is not an E30 but if you can please help me out tho) , which has an m52tub28 engine from a 728i E38 Auto. After starting the car the it idles fine.When pushing the accelerator , even flooring it , the revs go up to 2.5-3k then instantly start to drop down even tho I did not release the throttle. While driving I cant accelerate with the car at all, whenever I try to apply gas the car starts jump like it wants to stall but I was able to put it in gear and get driven by the idle. In the following video you can see how the car reacts to throttle in standstill. It is worse when I'm driving , like when trying to take off , it wont even rev past 1.5k and it all acts like it wants to stall. The car currently has no starter in it , when I was testing out things we started the car by pushing. I am going to install back the starter shortly and after it I really want to work this issue out. In the past I ran out of fuel with the car 2-3 times because the indicator shows more than there is in the tank and without knowing what the issue was I tried to start it up several times. Maybe I burned out the fuel pump? I am almost sure there are some vacuum leaks but the car ran just fine before so the vacuum leaks may not have caused this. We put the car to a tester and it gave the following errors: ABS,O2 sensor,Throttle pedal position sensor(I'm not sure what this means since the car has mechanic throttle ) , Multifunctional steering Wheel(the 7 series most likely had it, this one doesn't) , autotesting module (?).

    Here is a video I made of what is exactly happening:
    https://www.youtube.com/watch?v=tGc2m2J4uhw

    PLEASE HELP! write down any ideas you can come up with ! I didn't find anything like this on the internet , I hope someone else already had the same problem as I'm having!

    Thank you in advance! Have a great day !
    check fuel pressure..removed fuel pump carrier..check hose between fuel pump and carrier. sometimes they crack and develop a leak..
    88 e30/s50 gt35r turbo m3



    96 gt4094r turbo m3
    452 rwhp, 455 rwtq at 14 psi 91 octane
    681 rwhp, 684 rwtq at 25 psi E65

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      #3
      Sounds like it's in limp mode. ABS code I think will set it.

      Comment


        #4
        That symptom is normally caused by the thorttle assembly cable not being fully inserted. It can easily be bit loose when you don't know when it should click fully inserted.

        Also m52tu is really drive by wire. The thorttle pedal sensor and thrortle flap actuator are in the same assembly in the thorttle housing. Normally engine runs in drive by wire mode. But in limp mode (like you have going on right now), you can move the thorttle flap little bit mechanically using thorttle cable.

        Abs code only makes it not rev past 5000ish rpm

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