V12 long standing cold start thingy…

[silverback mike]

My DB9 has been sitting nicely in the garage on a trickle charger for a couple of months due to lots going on. I’ve noted some posts saying that they have a start up that can safeguard engine wear after a long sit up.

Please correct me if I’m wrong but the process is key in, ignition 2, foot flat on accelerator, then observe oil light which should go out….

Had anyone done this? I’m just massively wary of flooring a very cold engine in case it goes wrong. Especially having a 997 porker where this would potentially bore score massively.

Therapy appreciated prior to attempting said process chaps

[Stick Legs]

[yvr]

Check your owner manual. I think this only applies to DB9s with a Ford ECU. I'm not sure the Bosch ECU does the same (2013+ ?)

[vulcan26]

Must admit to never having quite understood this 'cold cranking to build up oil pressure before starting the engine' thing.

Surely if you cold crank the engine for 5-10 seconds, and that gives the engine say 50 full revolutions, and then you crank again but start the engine this time, what the difference between that and letting it fire first time around? The total number of cold unlubricated engine revolutions would probably be less and therefore surely less 'wear'??

[CatalystV12V]

yvr said:

Check your owner manual. I think this only applies to DB9s with a Ford ECU. I'm not sure the Bosch ECU does the same (2013+ ?)

I think you're right, this only applies to a Ford era ECU.

[CatalystV12V]

vulcan26 said:

Must admit to never having quite understood this 'cold cranking to build up oil pressure before starting the engine' thing.

Surely if you cold crank the engine for 5-10 seconds, and that gives the engine say 50 full revolutions, and then you crank again but start the engine this time, what the difference between that and letting it fire first time around? The total number of cold unlubricated engine revolutions would probably be less and therefore surely less 'wear'??

I guess it's down to the number of revolutions before full oil pressure is made and the if oil is residing mainly in the sump and time it takes to suck up and pressure the system...

Fairly irrelevant for ma as I have the Bosch ECU. But I did do this on my 2010 V12V..

[Minglar]

CatalystV12V said:

yvr said:

Check your owner manual. I think this only applies to DB9s with a Ford ECU. I'm not sure the Bosch ECU does the same (2013+ ?)

I think you're right, this only applies to a Ford era ECU.

That is correct. Don’t try cranking any V12 with a later Bosch ECU with the accelerator pedal firmly planted to the floor. It doesn’t have the same inhibitor, so it will end very very badly. It is the same situation with V12 Vantage. You can do it in the earlier six speed manuals, but not in the later S cars as the ECU is different. BRM.

[silverback mike]

Thanks all. I did wince a bit with the thought of flooring a cold engine

[Calinours]

silverback mike said:

Thanks all. I did wince a bit with the thought of flooring a cold engine

I’d venture that manufacturers watching all the Youtube videos of grinning ‘influencers’ doing precisely that hastened the introduction of soft limiters….