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  1. Need help - getting desperate! 
    #1
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    Clarebear's Car Details
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    OK firstly, Hi, I'm Clare I've just joined, and I'm in desperate need of some advice!
    I apologize if there has been a thread about this problem previously, but being short tempered and cold I simply don't have the time or patience to go find one. It's getting into minus temperatures and I need a solution. This is what happens:
    On very cold mornings, like 1 or 2 degrees or less, I go out to the car.
    turn the ignition on, fuel pump not priming. So ignition off and on again, fuel pump not priming. This goes on for a while. Eventually pump primes, car fires but dies immediately. Ignition on, fuel pump not priming, and this goes on for a while. Eventually fuel pump primes, car fires but dies immediately.
    This goes on for about 10 minutes and eventually it starts and holds, when the car is warm it is fine all day. On very very cold mornings I have to put blankets on the engine and use a hairdryer to get warm air into the engine bay, for about 15-20 mins, and eventually we get to the stage where we can go through all of the above.

    Now I've had it to one of the best diagnostics place in the North east and it's still not fixed. We've changed the fuel pump, fuel pump relay, ignition relay and he's rewired an live from the ECU to make sure there's always power.

    The problem is still there. Please can someone help me cos I'm running out of money to spend it getting it sorted!

    Thanks

    Clare
     
     

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    #2
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    Spirit's Car Details
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    can you tell me model and engine please i cant see it on tapatalk.

    did they read the codes on the car and tell you before replacing items?

    andy
     
     

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    #3
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    Hi Andy,

    It's an E46 2001 325i SE

    Yes they read fault codes, also replaced camshaft sensor and temperature sensor.
     
     

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    #4
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    Hi, there are some serious experts out there on the forum who really know what they are doing.
    However, sometimes a bit of "lateral thinking" can help. Yes, I am an IT person.
    I had an identical problem very many years ago (sixties) on my Marcos. My problem was when it actually froze, not just very cold. I had condensation in my fuel tank, and in my fuel filter. One bad batch of fuel is enough. This not only effectively blocked the line with ice, but the cold was making some of the rubber seals in my electric fuel pump too hard to seal. It was the sixties - we didn't have silicon seals then. My fuel filter was on the scuttle, and transparent, so I eventually saw the ice, and realised what was happening.
    The solution was to drain and clean the tank, and renew the filter. This was quick, not difficult and not expensive.
    Might be a total red-herring, but it sounds so similar to my experiences that there might just be something there. This is clearly out of the ordinary too.
    Good luck.
    Mike
     
     

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    was the fuel pump filter changed too with a new one?
    have you unplugged the maf too on first start?
    fuel pressure sensor checked?
     
     

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    #6
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    I think that's next on the agenda, change fuel filter and check pressure sensor, I'll mention it when I take it back.
    This is so frustrating! I'm running out of money to throw at it!
     
     

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    #7
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    Hi, there are some serious experts out there on the forum who really know what they are doing.
    However, sometimes a bit of "lateral thinking" can help. Yes, I am an IT person.
    I had an identical problem very many years ago (sixties) on my Marcos. My problem was when it actually froze, not just very cold. I had condensation in my fuel tank, and in my fuel filter. One bad batch of fuel is enough. This not only effectively blocked the line with ice, but the cold was making some of the rubber seals in my electric fuel pump too hard to seal. It was the sixties - we didn't have silicon seals then. My fuel filter was on the scuttle, and transparent, so I eventually saw the ice, and realised what was happening.
    The solution was to drain and clean the tank, and renew the filter. This was quick, not difficult and not expensive.
    Might be a total red-herring, but it sounds so similar to my experiences that there might just be something there. This is clearly out of the ordinary too.
    Good luck.
    Mike
     
     

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    #8
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    I missed Spirits reply.
    Common factor here, we both say swap the fuel filter. Always a good idea, but doesn't tick all the boxes.
    I think what i was getting at was cold = rubber seals go hard. I found mine when it actually froze, but the cold was causing half the problem, actual ice the rest.
    In my case, the pump was leaking pressure as the seals didn't hold until they had worked enough to warm up. Symptoms were identical to yours. My system was far, far simpler. Sixties electric pump, SU carburettor etc. but no fuel pressure = no start/poor start and then stall from lack of fuel.
    Is there an oil separator on these (mine are V8 and V12)? hard rubber not seating/closing causing big air leak? Might respond to being warmed under the bonnet? Problem I see with that is that it should show as air leak in diagnosis. Worth a look?
    Mike
     
     

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    Where in the north east are you from?
     
     

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    #10
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    Hi Mike

    So do you think it may be that a seal somewhere isn't working and damp is getting in? Or something similar?
     
     

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