V6 S2 Cutting out when engine cold

f00lzz · Post by **f00lzz** » 01 May 2011, 04:15

Hi All.
I have a developing problem on my S2 V6. When running from cold the motor will 'sometimes' just cut out dead... very disturbing at junctions and of course dangerous.. I'm thinking temp. sensor! any advise/thoughts etc would be gratefully received..

Post by **DHallworth** » 01 May 2011, 22:39

Ours was doing this.

Turned out to be the green temp sensor which is on the airbox side of the engine.

Took 10 minutes to change and made a world of difference!

David.

f00lzz · Post by **f00lzz** » 01 May 2011, 22:46

Thanks for that.. I'll give it a go.

andmcit · Post by **andmcit** » 01 May 2011, 23:08

My first v6 used to do this even when warmed up when the revs dropped.
After following advice here on the forum I changed the supplementary air
valve which seemed to cure it but the car locked me out of the immobiliser
not long afterwards so I didn't run it for long to prove the point.

And no, the replaced valve didn't stop the car starting, though I suspect
corrosion in the loom on the front crossmember to the battery box has.

The supplementary air valve is the silver canister on the side of the air
induction feed from the air cleaner box onto the head with a grey multi
plug - you'll hear it buzzing when the ignition is switched on.

f00lzz · Post by **f00lzz** » 01 May 2011, 23:24

When mine is warm it never misses a beat, in fact it is b****y fantastic. Just when it is cold it no longer inspires confidence at junctions

Post by **DHallworth** » 01 May 2011, 23:38

Ours came from Euro Car Parts and cost around £21.

David.

Post by **CitroJim** » 02 May 2011, 07:49

A Lexia diagnosis will confirm either way if the temperature sensor is good.

Also, beware of air leaks on the throttle body and inlet manifold. For this reason it's a good idea always to replace the inlet manifold gasket...

They cost pennies from the dealer.

Is your inlet air temperature sensor snugly home in the airbox and undamaged? It's easy to overlook this little fella when lifting up the airbox to get at other things...

Also, is the crankcase vent pipe well connected to the rubber concertina between the airbox and throttle body. The concertina can also split unseen. All of this can allow 'false' air to enter the inlet tract and upset the mixture.

Lastly, if you look and feel behind the manifold on the right-hand side, you'll feel a blanked-off spigot. The rubber blanking cap can can perish and admit false air.

f00lzz · Post by **f00lzz** » 02 May 2011, 08:40

Hi Jim.
New plugs two weeks ago so new gasket fitted, checked on the 'snug fit' of the sensor when I changed the LHM recently.. Q would any of the other causes only manifest themselves when the engine is cold? Lexia check costs £60.0 as against a punt at the sensor for £21.0 but before I do that tomorrow I will certainly investigate the other possibilities, thanks for the pointers..

f00lzz · Post by **f00lzz** » 03 May 2011, 15:52

DHallworth wrote:Ours was doing this.

Turned out to be the green temp sensor which is on the airbox side of the engine.

Took 10 minutes to change and made a world of difference!

David.

Hi David.
Can you identify the temp sensor you are referring to from the following pics?

http://s69.photobucket.com/albums/i65/z ... %20Sensor/

The last pic is the Intake air sensor that I believe Jim was referring to. I have changed that one but it only cost me £13 from Euro Car parts so me thinks it isn't the one you were on about.

Cheers

andmcit · Post by **andmcit** » 03 May 2011, 16:00

If the temp sensor is what I believe David describes it's one of x3 in a clutch
on the gearbox end of the cylinder head facing the bulkhead - access is better
from underneath on ramps as clearances are non existent from above/side.

Post by **DHallworth** » 03 May 2011, 16:11

Andrew,

The one I'm referring to is only accessible from the top unless you've got arms like Mr. Tickle!

Flooz, I believe it's the sensor in picture 2. If you can get a clearer picture of that I'll be able to explain better.

Look under the Lexia locations thread, there might be a member near you with a Lexia who can confirm which sensor it is!

David.

andmcit · Post by **andmcit** » 03 May 2011, 16:21

No, I'm talking about the green/blue and brown WATER temperature senders
which on re-reading previous posts is a different ECU input again to the air
temperature if you're talking intake - no direct mention of air temperature
although I may have missed it!!

Post by **DHallworth** » 03 May 2011, 16:46

It's the green water temperature sensor which is on a metal pipe that goes between the front and back bank of cylinders.

Once the airbox is removed it's easily accessible.

David.

Post by **CitroJim** » 03 May 2011, 17:08

DHallworth wrote: Once the airbox is removed it's easily accessible.

Luckily, it's the only one that is

The Bitron sensor is an absolute swine....

Chris570 · Post by **Chris570** » 03 May 2011, 17:10

CitroJim wrote:
DHallworth wrote: Once the airbox is removed it's easily accessible.
Luckily, it's the only one that is The Bitron sensor is an absolute swine....

took me 4 minutes Jim, dunno what the problem is