VDO gauge needle shooting strait up to maximum, fixed now
Posted
#708849
(In Topic #85516)
Old Timer
VDO gauge needle shooting strait up to maximum, fixed now
WHY are my 2 gauges oil temp and oil pressure when ignition turned on going STRAIGHT up to maximum??
ive been trying to sort this for weeks now, i tried what i think is everything.
as soon as power goes to it they work
please help
Posted
Old Timer
Gauge Probs
Best of luck anyway
Baller
Posted
Old Timer
also a water temp thats doing the same, stil stuck for ideas….
Posted
Old Timer
Posted
Local Hero
Posted
Settled In
:wink:
Posted
Old Timer
bytor i will PM you now and see, thanks.
Posted
Local Hero
Bert said
My TD done this when i put the engine in and tried to start it,it was the engine earth from gearbox to chassis,also check the earths from the clocks to the body.
Bert
Posted
Old Timer
Im stil pretty sure its not the earth doing this.
let me know paul if its that for u
Posted
Old Timer
I used a multimeter to test proper 12v is coming through on it and it is, so thats fine, tested for any breaks in the cable and none.
So as soon as the 12v gets eathed it shoots up to max on both gauges still.
even the meter says everything should be fine so why isnt it…
the two gauges im trying to get working are
oil temp and
water temp
Posted
Life Member
Posted
Old Timer
will check again later on.
i also have a spare sender that i could try too.
both senders are brand new but i realise that it could be broken anyway.
but even withought the sender cable on when + and - are on the gauge it still does it straight away again,
wether the signal wire is on or not.
it doesnt make sence.
well i hope this thread will help someone else out that has the same problem in the future if they read this.
literally did everything yesterday on my day off
Posted
Local Hero
1. Poor earth between engine and battery - which also affected starting
2. 2 'crossed' wires on the wiper motor wiring (I have a Mk2 upgrade, so my wiper motor wires don't have a plug, just 5x spade connectors which go into the original terminal on the car). This was causing fuse 11 to continuously blow
3. Some wires were inadvertently draped over the exhaust manifold and had partially melted.
Also, for info, when either the +12V or "gauge" wire on the oil pressure gauge was connected (but not at the same time, eg only one connection) the gauge jumped to off-scale beyond 10 bar. But with both connections, all ok.
Posted
Old Timer
i have all 3 brand new cables in the car and i metered them to check none are damaged.
glad yours are all working.
maybe could you take a pic of your sender if you can? if not dont worry.
thats all im beggining to think it might be?! as everything else i have tried.
Also yes i do have the mk2 wiper motor in mine too but seem to have no problem with crossed wires or fuses blowing.
so i must carry on until this is done.
its strange that with all the connections its all ok.but not withought, when all mine are ok and it still does it.
Must be the sender one, as 12v and - feeds are fine.
Posted
Local Hero
The oil pressure sender is on the oil filter housing, the one at the front, further from the engine is the 'low' one (0.5 bar) and the one nearer the engine is the 'high' one - 1.8 bar. My gauge sender is 0.5 bar switch/10 bar gauge, so it replaced the 'low' sender. The oil temperature sender (on a 16V motor) is at the back on the left, above the exhaust manifold and has a flat circular connector which a female spade can be pushed on to.
I have these pics:
1 is the 'low' (0.5 bar) oil pressure
2 is the 'high' (1.8 bar) oil pressure
3 is the oil temperature
My gauge sender is fitted in place of the switch in 1.
Posted
Old Timer
You could try putting the transmitter wire to earth on your car to see what happens?
I'm sure between us we will get there in the end. Best of luck
Baller
Posted
Old Timer
thanks both for your input with this.
Paul i will try that right now! thats something i havent tried.
i have tried 3 different senders today so i think its safe to say its not that either, must be where its placed.
well back out now ill try again. will let u know in a bit.
NB: my oil pressure plate thing has 3 senders on! im taking the front right one out to try this swapping over the senders so it could be that.
Posted
Old Timer
i dont know if it will move at all until i go out and get it warm which is what im going to go do now.
Here are the pics of what i have done.
1st: being the piggyback crimp i used to keep exisiting one (probably for MFA?) and also the new green wire feed going to the gauge.
2nd: is the 3 sender unit i have at the front of my 16v rather than the two one that paul has? dont know what the difference is. but heres a pic to show. I have just used an old sender from mk1 8v that i had before to fill in the hole as i cant find the proper one that came with the engine.
3rd: is the water pipe going into the side of the engine, i have a water gauge and once again dont know where that goes. looked in haynes that i own but i cant see it, i know its probably in there somewhere but i have no idea where. is it either of those?
Well i hope its finally over and done i will let you know how it goes later.
Posted
Local Hero
Why did you need to piggyback 2 connections onto oil temperature, are you running a VDO gauge AND MFA (which has oil temp)?
I guess you're into decoding the colours of the wires and tracing it through the wiring diagrams. If it helps, I have a Mk2 Golf manual in PDF form, with a bunch of wiring diagrams in it.
Posted
Old Timer
Well this mfa hadnt worked anyway after the test it stayed on - - - while the gauge worked perfectly! thanks alot for all your help by the way been doing this for weeks and weeks.
The temp seems to be much higher than the one on the mfa for some reason though?
the mfa would always show 91 ish when warm, but vdo temp shows very close to 130 on the gauge.
Is this becuase its attached to the head now? and making a much higher temp? and being near the exhuast manifold? i guess that would make sence.
In that case i always know what to use the other one on the oil cooler for now if i get a pressure gauge back.
so yes now just working on the water temp, oh i just realised what you wrote, i have the pdf file of the mk2 manual i downloaded it but thankyou very much for offering, i spent a while looking for it a few weeks back.
Im not sure about the colour coding or where to go as the engine wasnt installed by me i took it to a garage to get the work done and i dont know if they would have kept to the right colour code or not.
So i dont know how to tell where they go.
There is alot of bright colours used so a bit confused.
bet you cant wait to get yours up and running. Very close now i read, well done, admire you done it yourself.
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