Engine running on after shutdown

[uktom]

Any ideas? 3.0 litre V8 After shutdown and removing the keys the engine runs on. The only way to shut down is to remove fuel relay
This only happens after running a while. If you start engine and switch straight off it will shut down normally
At a loose end with this one!!

[BlueM60]

Check main relay, sounds like it may be sticking. Replace it and fuel pump relay to be sure. If not relay, check electrical portion of ign switch, wouldnt be very likely though based on the "only happens after it runs for a while" part. Hope this helps.

-Ben

[uktom]

The fuel relay is the white one under the ECU right? Which one is the main relay?
thanks for your help so far!


Tom

Check main relay, sounds like it may be sticking. Replace it and fuel pump relay to be sure. If not relay, check electrical portion of ign switch, wouldnt be very likely though based on the "only happens after it runs for a while" part. Hope this helps.

-Ben

[BillionPa]

on mine the fuel pump relay is green (my new one is silver) and the main relay is the white one.

[BlueM60]

Main relay should be a 5 prong white relay.

[92E34]

Matters on which year. Mines blue.

[shogun]

@uktom

Please update your profile with the necessary car data, model and month and year of production, that is absolutely necessary to help you with wiring diagrams etc.
If you do not know the month/year of production, visit my website below and search for VIN decoder, that will give you the necessary info and also on the engine type which should be an M60 engine.

[BillionPa]

model too, his is a 3L V8 like mine, so the colors will be more similar. BMW did change the part numbers over time, so white/green is the stock part colors, and white/silver is the new ones... for the M60 cars anyway

[uktom]

Check main relay, sounds like it may be sticking. Replace it and fuel pump relay to be sure. If not relay, check electrical portion of ign switch, wouldnt be very likely though based on the "only happens after it runs for a while" part. Hope this helps.

-Ben

Hi Guys,

next installment!!
Well I replaced the two relays main and fuel............ Guess What???
Yes it still runs on after I remove the key.
I remember years ago cars doing this when they had carbon deposits. But that was before electronic ignition and fuel pumps.
Any other ideas??

Cheers
Tom

[billy]

Hi Guys,

next installment!!
Well I replaced the two relays main and fuel............ Guess What???
Yes it still runs on after I remove the key.
I remember years ago cars doing this when they had carbon deposits. But that was before electronic ignition and fuel pumps.
Any other ideas??

Cheers
Tom

could the ignition switch be faulty?
does everything else shut down apart from the engine? ie the instrument cluster turns off?