Its starting itself!!! Help Please

Well, now my Disco 300 TDi is now starting itself! Quite a change from the threads of ‘not starting’ recently!

As soon as I get to stage 2 of the ignition it starts to turn over, and even when the engine is running its still turning over the starter motor.

I have pulled the spade off the started solenoid, to stop it starting, and then have ran a 12v live to the spade, and this turns over the starter motor fine, so can rule that out.

After searching the forum, I found someone else had a similar problem, and that was down to the ignition barrel – well mine was getting a bit stiff with the key, so thought I would replace that, and still no cure.

In the cold spell, it wouldn’t actually turn over, so I did think there was a problem with the Starter Motor, but as I have mentioned, that turned over fine with the 12v live direct from the battery, so I made up a push button start to get it going in the cold, now I am again using this to start given I have had to remove the original feed from the ignition.

Any idea’s on what to try next?

It must be something simple, as I can leave the gear lever in ‘Park’ and it won’t turn over and the glowplug light stays on to warm, but leave it in park, and turn to stage 2 of the ignition and the glow plug light goes out straight away and will try and start the car without the need of turning the key.

I am thinking maybe a duff Starter Relay??? but I have tried to find this with no luck – have even pulled out all the 8 or so relays one at a time in the passenger footwell to see if that stops it turning over, but no.

Its driving me mad – please help.......

could be ignition switch.

graham
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98 d1 300tdi auto.

if you meant the ignition switch on the barrel, I have already changed that for a new one

did you change the ignition lock barrel... (the cylinder with the key that slides in) or the complete ignition switch that bolts onto the steering column ? sounds like the contacts in the bottom of the switch assembly are toast.... if youve allready changed it, it points to melted wires somewhere in the loom.

I changed the complete ignition switch that bolts onto the steering column.

I was hoping that it wasn't going to be the wiring loom, with it not starting and then always starting, points more to a component failure than short in loom (hopefully).

Does anyone know the route the 12v positive feed wire takes from the starter motor, to where this actually comes from, so I can start to trace the wires to wherever they go?

Maybe you bought Knightrider??

does it talk aswell??

Well, here is the culprit that was causing me all the problems with the disco auto starting:-





You can see that the connectors and block are pretty corroded to say the least.

Also when I tested the relay, there is still a circuit across the to pins when it should be completely closed, so hence the disco trying to start all the time.

After a search on the internet I found that there were more relays behind the kickplate of the drivers foot well.

So pulled it off last night, and located the worst looking relay, pulled it out, and the glow plug light stayed on for its warm up, and no trying to start instantly – result.

Found a relay in my garage – a 30/40A one which I put in its place, and it would only start with a bit of wiggling, so I snipped off the connector block, and put new spade connectors on the wires, connected back up, and starts perfectly.

So my next question is, is there anyway of finding out what amp relay the knackered one is, to make sure the one I have put in will last?

I would suggest a google of the relay part number to get the datasheet. Just had a quick google myself and there seems to be stuff for siemens v25134. I can't make out the numbers from the photo though. Can you let us know what they all are?

It has on the Relay:-

SIEMENS

V23134-B52-X130

YWB 10027

12v

Also has R6FO on the top of the relay, not sure if that will help or not.

looks like ebay might be a good start:

TYCO YWB10027 MULTI FUNCTION RELAY 12V V23134-B52-X130 on eBay (end time 23-Dec-10 18:27:19 GMT)

or there is some more info on the D90 website:

Relay replacement help - The D-90 Source

Thanks for that - I have also been pointed to this link on ebay too:-

RELAY YELLOW YWB10027 LAND RANGE ROVER CLASSIC SIEMENS on eBay (end time 23-Dec-10 13:58:00 GMT)

Thanks for you links tho

Been advised its a 30A relay so the one I have replaced it with will be ok in there to save buying a one thats 'yellow'