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Thread: Possible Alternator Problem - Bought new battery.

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    'LS' Member
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    Possible Alternator Problem - Bought new battery.

    Hi all, ive had a problem with especially the lower gears and coming to junctions and the car cutting out or almost, so for instance i can no longer take a junction in 2nd gear it will have to be first or it will die/attempt to.

    i knew i needed a new battery so thought this may be the cause, got that fitted and voltage checked and all was well,

    its still doing the same, could this be due to the alternator not working as good as it should ?

    i see it running, when idle it doesn't run the greatest but not by any means bad,

    cheers,

    its a Corsa SXI 1.2 Standard.

  2. #2
    'VXR' Member Vegas's Avatar
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    Not sure how you've come to conclusion it's battery/alternator related.

    Is the battery lights coming up on the dash!

    When it stalls does it start up again?

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    You do need the battery to be well charged to avoid problems, but as you have just had a new one and had the charge rate checked, I wouldn't think that it is low voltage that is causing your problem. If the battery will spin the engine over at normal cranking speed, then the battery is reasonably OK.

    How is the car for servicing? it may simply be that it is due for a full service.
    If the lack of servicing is not the cause, then I would advise that you get any fault codes read, then clear them and see if they re appear.

    Regards.

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    'VXR' Member Taurus's Avatar
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    Easy to check if your alternator is putting out a charge - measure the voltage at the battery with the engine running, should be around 14v.

    As others have said, problems idling could be a number of things - what year/model is yours (as the idle control varies on them)
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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    'LS' Member
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    At idle its fine, it starts no problem and if it does stall will start right away,

    as i say this only happens when coming down the gears or slowing right down,

    the battery has been taken out for a full charge,

    last service would have been christmas time, and i don't have a meter handy,

    its no problem getting it to the garage where i purchased the battery, i just presumed alternator as i could only think of that and the battery (which got replaced)

    I may get it on my uncles diagnostics and he may even be able to fix it there and then, but i was hoping it was something i could sort myself, an its the is the 2002 model SXI

    Thanks.

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    'VXR' Member Taurus's Avatar
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    OK - fly by wire idle control on those, so no ICV to look at. I'd check basic service items, especially the plugs, and if no better give the throttle body a clean.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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    'LS' Member
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    Thanks just recently had the AFM replaced so maybe their is another sensor on its way,

    hoping i can get it on my uncles diagnostics by the weekend and find out. thanks.

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    'LS' Member
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    BTW - By checking the plugs you mean spark plug ? and if so what do i do ? remove and clean with something ? make sure they all spark ?

    ive never done anything spark plug wise so i dunno..

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    'VXR' Member Vegas's Avatar
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    Just have look at the general condition, may show a problem,
    Post pic of your findings.

    If you don't know how long ago they were changed id change then anyway

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    'LS' Member
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    Full service at Christmas but who's to say they really changed the plugs lol,

    ill see what i can do before i call my uncle, thanks guys.

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    'VXR' Member Vegas's Avatar
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    Ages ago... You be changing oil every 6 months really

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    'LS' Member
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    Thanks, should have it looked over today.

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    'LS' Member
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    Ok well as ive got a few hours to kill before work i thought id have a look at the car, having no money atm im trying to fix this problem myself,

    i have taken spark plugs out and they have been well cleaned, the battery has been fully charged yet again, and i have half a tank of petrol lol,

    anyway ive cleaned and inspected the spark plugs, all looked well, fitted, started fine, then i had the same problem.

    it either cuts out at junctions or tries to when going into lower gears,

    throttle body clean is next, just about to do that, i assume their is a guide ?

    what would be next if the problem persists ?

    thanks.

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    'LS' Member
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    Throttle body cleaned, Air filter is clean, spark plugs are fine, it fires up fine yet im still having this problem.

    As i say its only when coming to a junction ill have to drop to first else it will die on me.

    what to check now ?

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    'LS' Member
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    Anything else i can do with little tools etc?

    I sure won't make it to work tomorrow in it, well i can but i just dont trust the thing.

    it must be minor, but ive read so many reports on it being certain things, all i had to do was type in corsa c boggin down in lower gears to find that on google, but their are so many variants ,

    i guess its either i try the diagnostics thing on here ? if someone could like id appreciate thanks.

    or wait and get it to a garage ?

    as i say ive already bought a battery so im looking to fix this myself having recently paid 80 for an Air flow meter sensor

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    'LS' Member
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    To be clear, i can still use the tutorial for EML checking can't i ? i know the light isn't up, but would it still flash if i was to do what said in the manual and give me an idea of what the problem is ?

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    'VXR' Member Taurus's Avatar
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    Was the replacement AFM a genuine Bosch one?

    What did the plugs looks like when they came out - where they grey, or black and sooty. Bad idle could be running too rich due to weak coolant temp. sensor.

    Does it idle OK when cold - or is the problem both cold and hot?

    Another common issue on them is the EGR sticking. That can let exhaust gases into the inlet when it shouldn't be happening. You don't always get a code for some issues.

    As you say there are numerous possibilities, once you've checked the most usual suspects the rest need to be worked through one by one.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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    'LS' Member
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    Thank you, and yeah genuine Bosch one, the car barely ran before they fitted it so im sure my AFM is ok,


    Yes plugs were sooty, gave them a light rub with autosol and it brought them to new,

    as i say the car starts first time everytime so no problems on that front, idle is fine both cold/warm

    if i can get as many guides etc ill be able to give them a go tomorrow so far ive ;

    Cleaned throttle body
    Spark plugs removed and cleaned
    AFM fitted not long ago


    would the tutorial for EML diagnostics light work, even tho mine isn't appearing as a fault ? if that makes sense.

  19. #19
    'VXR' Member Vegas's Avatar
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    Sooty? How sooty? All the same? This is why I requested pics, just because car stars doesn't mean spark plugs are fine.

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    'LS' Member
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    It wasn't caked on, came off easily with a cloth and a light rub with autosol, and yes all the same

    sorry i just presumed with the plugs looking fine it couldn't be that, as i say im trying to do it on the cheap so going out to buy spark plugs just to see if its that isn't an option atm

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