Engine keeps running with ignition off ?

[ukmastiff]

Lo all, now I cant believe that this isn't really obvious to someone and a 'known fault' somewhere.

Just got the car out to dust it down , run the engine and top up some fluids, and as the title says turn off key engine keeps going and going. The thing is, if its the obvious ignition switch I'm confused as when you turn the key off without the engine running or with , all the dash lights go out as they should suggesting to me the switch might be working properly ? but if thats the case how come the fuel pump keeops supplying the car with fuel let alone ECU/ spark etc.

So from start get in car turn key to position one , relay clicks , position two and all lights come on dash as normal , if you then turn key off without starting car all lights go off as normal ! , also I left the car in garage for 2 weeks with no trickle charger on and the battery has not gone flat so I am thinking ignition is not permanently on ?

However if you start the car then turn key off all lights go off but the car keeps going. To stop the car I either stall it or pull what i think is the DME fuse. I dot think its due to the auto lecie who removed the immobiliser because the car did do this once when i first got it prior to his visit but the fault then went away and has only just re appeared !

Any good clues on this one ? , I sure need some because the auto lecie broke something on my car and then wanted to charge me to come out again ! so I dont wont to be using him.


Regards

Mas

 

[T3rra]

Simmler problem on tipec.

 

[ukmastiff]

I was rather hoping for a cure not similar problems []

On a serious note the topic isnt jumping out at me ?

Mas

 

[T3rra]

S2 won't turn off, Jon had input on the tread so MIT be off use

 

[ukmastiff]

I just read the topic all it said was bad alternator or bad ignition switch.
Surely if its anything other than the switch then the fuel pump would have no power with yhe key in the off position ?

Im stumped . I think maybe i need to get an ignition switch off someone to rule that out.

Mas

 

[Hilux]

The ignition barrels are from Golf Mk1 vintage and notorious for poor or failed/crossed contacts

The switching in them even from new always feels like its worn out and imprecise.

Remove the barrel and check the contacts I`d say.

 

[944 man]

Id guess that its the ignition switch, on either a series one or a series two car. The ignition switch is different from a VAG part, even on the series one cars which use a Golf steering lock - there are more connectors on the 924/944 part.


Simon

 

[Hairyarse]

I had same problem on an old E36 BMW some years back and it was the ignition switch.

 

[Hilux]

Id guess that its the ignition switch, on either a series one or a series two car. The ignition switch is different from a VAG part, even on the series one cars which use a Golf steering lock - there are more connectors on the 924/944 part.

Correction noted but it is so vague (like a Golf) it must be the same manufacturer with the same flaws/faults?

 

[peanut]

sounds like the 12v+ supply to the DME relay is not getting disconnected

 

[ukmastiff]

Thanks chaps , that's a lot more info than I had.

I did consider the wiring because as I said the electrician removed the immobiliser and didn't do it '100 percent'.

However if i'm honest I am sure this fault happened once BEFORE the electrician did his stuff.

Having read your replies , I'm thinking since a spare DME is always a good thing maybe buy one and stick
it in anyway to rule that out ? ,

Also is it very difficult removing the ignition switch and if i do will I need to swap it over rather than be able to 'test it' ?

Thanks

Mas

 

[peanut]

if the car worked before the immobiliser was removed then you should take it back to the idiot ahem auto technician that removed it and tell him to fix it.
It sounds like he has inadvertently made a constant live connection to the DME relay

 

[ukmastiff]

I should have explained it better I'm admitting this was intermittent BEFORE he removed it and it is intermittent since , I don't think he is to blame TBH but may be wrong.

Peanut is there some way I can check this just in case I have the history wrong ,
though I don't know car electrics I am competent with a multi-tester due to my previous 'other' electrical experience ?

Cheers

Mas

 

[peanut]

yes you can check this but its bl**y complicated mas []

What model and year is the car ?

 

[repsol]

get to the dme relay and check to see if it has the switch wire powered up if yes then its more than likely the switch or a short in the loom if it is powered up try to get to the wires behind the switch and pull them off if it turns of bingo its the switch if not get a spark in ive never had to get the ign switch out of a 944 so not sure how hard it will be to get to the wires bit defo wont be impossible

 

[ukmastiff]

Its an 85 turbo.

Mas

 

[peanut]

thats the non oval dash model with the battery under the bonnet yes ?Ok I'll have to refer to my schematics as all of my cars have been later with a lot of differences.

get back later ...
[][]

 

[ukmastiff]

No , its a turbo so its an oval dash . Mine was registered in dec 85 but folk would call it an '86 model year' so an early off set turbo.

Thanks anything i can check would be useful.

Mas

 

[peanut]

The problem might be that the ignition switch is fubar'd in which case it is not disconnecting the supply to the black wire on the switch which goes to the DME relay .

 

[944 man]

Assuming that what Nick says is correct, then you can rule out a loom fault be disconnecting the ignition switch whilst the fault is in progress.

Expose ignition switch loom connector
Turn off engine using key
Whilst engine continues to run disconnect switch

If the engine stops it was the switch.