Trouble Starting 20xe'd corsa
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    MIGWeb User vauxtillidie's Avatar
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    Trouble Starting 20xe'd corsa

    i had the engine running the other day fine for about 20 mins, now yesterday i changed the fuel pump and adjusted the gearbox mount to make the driveshafts fit properly cus i was using spacers. anyway i did all that and came to start it up, its not firing atall, checked fuel was getting through and that theres a spark and all was well there.

    whether ive dont somethin when i took the engine mount off maybe loosened a sensor or somethin underneath i dont know (seems unlikly )

    also b4 i changed the fuel pump i used to be able to hear it when i turned on the ignition for a few seconds but now it doesnt do that, ive put my old fuel pump bak in (spi one) and it still doesnt work and i still cant hear it, hae i blown the relay even thought theres fuel still getting through?

    any ideas, please help had enough of this damn thing now!!
    Astra GSi Turbo

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    Strange. If there is fuel getting through you *should* be able to hear the fuel pump. It wont be getting to the engine otherwise.....

    IMHP it's time to get the multimeter out and check for supply @ relay and work back from there.

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    check the FI fuse (fuel injection)
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    MIGWeb User vauxtillidie's Avatar
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    is it possible the relay could be nackered?
    Astra GSi Turbo

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    all fuses are fine, oh also i tried a bit of easy start and it fired but didnt startup
    Astra GSi Turbo

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    Yep, they do die, randomly and for no apparent reason. Easy to check with a multi meter though, just check for a 12v feed on one of the 'big' terminals, (relay disconnected) and for 12v from the other big terminal (ign switched on-foe a couple of secs, or engine turning over).

    HTH Stu.

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    MIGWeb User vauxtillidie's Avatar
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    cheers ill try that 2moz, still dont understand fuel gettin to the engine but i cant hear the pump doing anything
    Astra GSi Turbo

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    the pump doesnt run until you turn it over on an xe,they dont prime when ign is first turned on like nova gte's.
    Just go round and check all the sensors,if its started ok in the past you have prob caught something.
    You seem to be having no end of trouble with this conversion,bet you cant wait till its over!
    Dave

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    the pump doesnt run until you turn it over on an xe,they dont prime when ign is first turned on like nova gte's.
    Yoom right.... *holds head in shame*

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    got the polarity the wrong way round on the pump maybe ?

    i presume you pressed the schrader valve on the fuel rail, to see if there is pressure there ? you will get an eyefull of petrol if the pump has worked at all. if theres no pressure or just a trickle thats not enough.

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    Originally posted by dathers
    the pump doesnt run until you turn it over on an xe
    mine used to.

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    you will get an eyefull of petrol if the pump has worked at all.
    Loss of eyesight in one eye, horrendous stinging sensation = fuel pump working

    Just been and checked my GTE, cant hear it priming, but there again cant hear much at all nowadays.....

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    fuel pump relay powers the injectors, idle stabilisation valve, fuel vapour recirculation valve, part of the ecu, aswell as the fuel pump itself.

    p.s quote from the motronic manual...

    When the ignition is switched on. the ECU briefly earths relay contact 85b at ECU terminal 3. This energises the second relay winding, which closes the second relay contact and connects voltage from terminal 30 to terminal 87b, thereby providing voltage to the fuel pump circuit. After approximately one second, the ECU opens the circuit and the pump stops. This brief running of the fuel pump allows pressure to build within the fuel pressure lines, and provides for an easier start

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    dodgy earth on the inlet mainfold, that causes loss of power as the engine moves?

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    MIGWeb User vauxtillidie's Avatar
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    Originally posted by dathers
    the pump doesnt run until you turn it over on an xe,they dont prime when ign is first turned on like nova gte's.
    Just go round and check all the sensors,if its started ok in the past you have prob caught something.
    You seem to be having no end of trouble with this conversion,bet you cant wait till its over!
    Dave
    your not wrong there dave, just as i sort one thing e.g driveshafts/gears the damn thing dont start! im sure the pump used to run for a sec or two while the ign was on, i used to hear it neway with the spi pump.
    Astra GSi Turbo

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    sheesh

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    Just been back outside. Got the Mrs to switch the ign on and off, with me sat by the O/S/R wheel. Pump DOES NOT prime when the ignition switched on, at least it doesnt on my GTE 16v......



    Maybe it depends on ECU vintage?

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    you sure she werent turning the lights on and off ? lmao

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    Tis possible I s'pose......

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    swap pump polarities round, and try again.

  22. #21
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    dont understand how i can get the polarity wrong on the pump as on the corsa theres 2 plugs that can only fit in there own places if u know wot i mean, theres no way i cud have plugged it in wrong
    its gotta be somethin simple if i had it running the other day before i changed the pump, im guessin fuel pump relay but surely it wouldnt pump while engine was turning if it was the relay
    Astra GSi Turbo

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    Is it deffo pumping when engine is turning over? Then there is nothing wrong with the relay by the sounds of it....

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    did you mess with any of the feed and return lines, or literally just swap the pump ?

    could also see if the injectors are pulsing by sticking the multimetre in one of the plugs, then crank the engine.

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    to remove the pump in the corsa you have to remove the wires and hoses in order to get the pump itself out of the casing.

    if you can hear the pump priming then the polarities correct.

    then remove the cap on the fuel rail and push the valve in to test if fuel pressure is present @ the rail if it isnt, swap the hoses @ the pump end around till fuel reaches the rail.

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    what type/year of car did you get the engine from??

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