engine cutting out

[noble girl]

Has anybody out there suffered engine cut out either when slowing to a halt or during normal driving when engine is hot?
This has happened 4 or 5 times in last few months but more dangerously when doing 70 (really!) on the M25 in outside lane the engine just gave up and took a couple of goes to restart. It feels like fuel starvation but plenty in the tank and once restarted goes fine.
A bit disconcerting on a motorway!!

[goodlife]

Two things spring to mind :

1) Do you have the latest engine map?
2) Strongly suggest getting your dealer to have a look at the fuel filter. And don't rev too hard until they have.

The restart tends to take a few goes if your foot was left on the accelerator (even briefly) after the engine cut out. Happened to me after a slow spin in the wet at Rockingham a couple of weeks back. Put it down to flooding the engine - but not being technically minded I've no idea whether this is right.

[noble girl]

Thanks for advice. The engine map was put on at Rockingham in October by the guy with the laptop so don't know whether this is latest. The car performed better as a whole since the engine mapping done but it never cut out before the remap so could be problem source. I will get Mole Valley to check out the filter as you suggest.

[actech]

Make sure you only put Super Unleaded, Optimax or BP Ultimate in it. Using below 98RON may cause the odd misfire and engine stall.

[amg merc]

actech said:

Make sure you only put Super Unleaded, Optimax or BP Ultimate in it. Using below 98RON may cause the odd misfire and engine stall.

Anthony, I need to query this statement: the factory told me normal unleaded is fine! Factory would you like to respond?

[micknall]

Actually, no. The M12's engine is actually designed to run on 95RON unleaded. While introducing 98RON will not actually harm it, neither will it improve its performance. But if you're dead keen, Optimax will boost your performance by around +1 per cent. At a price, though...

[micknall]

Noble Girl,

Because the cutting out may have been caused by a number of different things, my advice is to take your car to your dealer. If it is a mapping fault, their diagnostic equipment will find it.

Any problems, please call me at the factory.

Simon Hucknall
Press Officer
Noble Automotive Ltd.

01455 844 052

[actech]

Then there must be something wrong with my mapping then, because whenever I use 95RON I get intermittant idling! 98RON and above it is fine!

[micknall]

Anthony,

Best to contact your dealer and ask him to investigate. You should not need to use 98RON.

Any probs, please call.

Simon

[Marlon]

Don't have it in front of me, but doesn't the handbook say to use 98 RON? Fairly sure it does...

[micknall]

Marlon,

You're absolutely right! No excuses for this. However, I can assure you that 95RON IS the correct fuel for the M12.

Will make sure that the Handbook is ammended.

Simon

[ashp]

i guess the cost of running a Noble just got cheaper

[MisterX]

micknall said:

You're absolutely right! No excuses for this. However, I can assure you that 95RON IS the correct fuel for the M12. Will make sure that the Handbook is ammended. Simon

Suggest dealers are told of this too, as they are also advocating 98RON/Optimax.

[noble girl]

Just for the record I have always used Optimax as per the manual and dealer advice. Car now booked into Mole Valley next week for a thorough checkout.
Simon,
Many thanks for the offer to contact the factory but let's see what Mole Valley find.
Am I now correct in assuming I can use 95RON in future as the cost saving over Optimax is considerable.

[micknall]

Noble girl,

Yes, do use 95RON unleaded in future. Apologies to everyone who has been misled by our handbook. Apparently, early 2.5l maps did run better on 98RON, but I believe we've replaced most of these now.

[Lynton]

Hi NG,

You don’t say which M12 you have. I had a similar experience - I took my M12 GTO into MV for a service and the day after collecting it I had a couple of cu-out experiences. Then it failed to idle altogether. I took it back to MV and one of the mechanics sawed away with a pair of mole grips (no pun intended) but could not sort it out and the diagnosis was faulty ECU - the old Magneti Marelli type. The M12 then went back to the factory for fitment of the new ECU - non Magneti Marelli (never trust Italian electrics). It also had the latest map as of December.
Hope this helps.

Best regards,

Lynton

[MisterX]

Don't have a clue what engine map mine's got, not that I've had any problems.

Question: Does the map get checked as a routine during servicing, or would I have to specifically ask the dealer to make sure it is the latest version?

[noble girl]

Hi Lynton,
The M12 is 3 litre GTO ( non R). Last serviced in May last year. Bought in April last year. "latest" engine map put on at Rockingham day in October.

[kinetic]

Lynton

I've sold my car now (M12 2.5L) but had exactly the same problem as yourself!Took it in for a 6000 mile service after 12 months faultless ownership. Picked it up next day to find it was cutting out then soon thereafter would not idle at all. Took it back to dealer who diagnosed faulty ECU (Nothing to do with their service ofcourse!)

Luckily Noble replaced the ECU under warranty but it was concerning that I took in a perfectly good car and got back a faulty one!!

[Marlon]

micknall said:

Marlon, You're absolutely right! No excuses for this. However, I can assure you that 95RON IS the correct fuel for the M12. Will make sure that the Handbook is ammended. Simon

Oh dear, that is very unfortunate.

Here's the problem, the Optimax I have been using (under Noble's guidance) has almost certainly caused the carpets to get a bit muddy and (what more proof do you need) no more stone chips have appeared since I (quickly) switched to standard unleaded. Simon, I'll bring it round to the factory for a respray and valet next week.