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  1. mig_v6

    mig_v6 VxON Club Member VxON Club Member

    Messages:
    911
    Likes Received:
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    Location:
    Matlock, Derbyshire
    This started the other day after it had rained quite a bit. I went through a reasonable sized puddle, at about 5 mph as I was in traffic.

    The rev counter went down to about 500rpm mark and wouldn't move even when I revved it slightly, it went back to normal after a minute or so.

    It's now progressed to sticking to about the 500rpm mark at start up, then gradually start working. Sometimes when accelerating in 1st gear more than i normally would the rev counter will go to about 2k but get stuck there, putting the clutch in make the needle drop back to the 500rpm mark and sticks there. Once it starts working properly, it's fine for teh rest of the journey.

    Finally, yesterday, I was coming home from work and it had stuck at the 500rpm mark all the way home. I revved it alot (sounded like it does at about 4k) and it started working.

    Any ideas?
  2. greasemonkey

    greasemonkey VXon Frontera Monkey VxON Club Member

    Messages:
    9,866
    Likes Received:
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    Location:
    Bury St Edmunds Isuzu Land
    Drives:
    Frontera
    Alternator brushes covered in muddy water
    regards
    Steve
  3. mig_v6

    mig_v6 VxON Club Member VxON Club Member

    Messages:
    911
    Likes Received:
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    Location:
    Matlock, Derbyshire
    Any way of sorting it without taking it off? Is it sprayable with anything? Clean water?:ROFLMAO:
  4. mig_v6

    mig_v6 VxON Club Member VxON Club Member

    Messages:
    911
    Likes Received:
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    Location:
    Matlock, Derbyshire
    Looks like i'll be taking the alternator off and apart to try and clean it. Came to it yesterday morning and battery was flat. Jump started it and could tell the alternator wasn't working as after a min or so the lights went dim.

    I expected it to die, but dash clocks lit up again and lights were fine. Dirt somewhere or a dodgy connection I'll find out at the weekend.

    There's also the possibility the alternator is fubar'd :ROFLMAO:
  5. Carlo_Raffo TDS

    Carlo_Raffo TDS New Member

    Messages:
    306
    Likes Received:
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    Location:
    Brum
    Our astra showed exactly the same symptoms, the rev needle would jump about and then showed error lights on the dash in particular the airbag light. Then it wouldn`t start, the alternator needed to be replaced.
  6. Dom

    Dom Well-Known Member

    Messages:
    2,378
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    Location:
    Wellingborough
    Sounds like either the alternator (possibly water in the plug) or the fan belt is slipping.
  7. bigspj

    bigspj Active Member

    Messages:
    228
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    Location:
    anglesey, wales
    A problem i know well from my astra TDS. The slightest sniff of heavy rain or driving through a puddle and the alternator wiring would throw a wobbler. one day the alternator went when i pulled up in work resulting in the battery light illuminating and the rev counter dying and on the way home the rev counter did not register at all as it was getting its feed from the alternator, However over 2000 rpm it would kick in and read correctly right throught the range but under 2000 rpm would drop down to nothing again. Alternator replaced car was fine. But every cold and damp morning the car would start and the rev counter would hardly read until after a few seconds when it would rise slowly upto the correct rpm. The alternators on these isuzu engines TDS are not in the best place as they get all the water from the road into them such as puddles. Following a wagon on the motorway too closely in the rain used to upset it as well it would decide to not charge until i was in front of it and it dried itself out. The 2 pin plug on mine had seized on the original alternator so vauxhall decided to cut the waterproof plug off to change the alternator and crimp 2 female spade connectors on in its place but no matter how much i wd40 the connections and filled it with silicone i could never waterproof it after they butchered it.:shake
  8. mig_v6

    mig_v6 VxON Club Member VxON Club Member

    Messages:
    911
    Likes Received:
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    Location:
    Matlock, Derbyshire
    Well I got under the car yesterday morning, after lifting the bonnet and not being able to find it after looking for a couple of mins and thinking "it can't be down there" :ROFLMAO:

    Belt was a bit slack, adjusted it but wasn't far off maxed out on the adjuster before I started. So new belt needed

    Not wrong there, that's why I never thought about looking down where it is. Gave it a good spray of WD40 and jobs a goodun'.

    While we're on alternators on the Isuzu engines, do they run the oil pump. If not the main a sort of aux oil pump? As on the side, there's a housing with lines running from it to the sump.
  9. paul.spencer

    paul.spencer Well-Known Member

    Messages:
    1,913
    Likes Received:
    75
    Location:
    Waiwhetu, New Zealand
    Drives:
    96 Astra Estate X17DTL
    Isn't that a vac pump?
  10. Dom

    Dom Well-Known Member

    Messages:
    2,378
    Likes Received:
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    Location:
    Wellingborough
    Yup - Vac pump

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