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car will not start when not fully hot but will start fine cold or fully hot

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    car will not start when not fully hot but will start fine cold or fully hot

    so i changed the CPS checked all the fuel stuff. Today i got it to where it would not start, it will crank all day, but will not start.
    On a whim I pulled the positive battery cable, put it right back on cranked it and it fired right up without a hiccup! turned it off, cranked it a couple times, started up a couple more times, then again, would not start.
    pulled the pos. wire again, and it started right up again. sooo i guess what im asking is what would work fine after its has been reset, the DME? how would i diagnose this?

    car: 86' 325es 5spd

    #2
    If you have already changed the cps sensor, next is try to replace the main relay. I think that is what my problem was from before.
    sigpic
    327is
    325es
    325es
    318is
    Fiesta ST
    E46 M3

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      #3
      I checked it before and it seemed fine pulled it put it back in started a couple times agian then i shook it and some thing was shaking around in it so im guessing that is it then? But when i jumped the fuel pump relay to test my pumps and they were fine pin 30 and 87 dosent that run through the main relay?

      Sent from my VS930 4G using Tapatalk 2

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        #4
        Iirc i think main relay has a ground during start and unground when run. Relays can fail intermittently. Replace it and report back

        Edit. Check ground connections too.
        sigpic
        327is
        325es
        325es
        318is
        Fiesta ST
        E46 M3

        Comment


          #5
          Okay thanks its just wierd that it only does it when its warm and runs fine after after i pull the battery....

          Sent from my VS930 4G using Tapatalk 2

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            #6
            The first thing you need to do is to determine if this is a fault in the engine management system, or something else. Check to see if there is spark, injector firing, and normal rail pressure when the no start condition occurs.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

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              #7
              I had spark and fuel most of the time then randomly no fuel. i would before wait 10min or so and my car would start up and purr like nothing happened. now i found if i pull the battery cable the car will start after that. also sometimes after i pull the silver main relay. i could not think of any more things to diagnose. my pumps are both fine and have good pressure when running.

              Sent from my VS930 4G using Tapatalk 2

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