Excessive revs on start-up

[Bert321]

I have a 2015 Mazda 6 with the same 2.2 diesel engine.  Mine does the high rev thing, but only on warmer 'mornings'.  I'd say it's nothing to do with fuel, more to do with ambient temperatures.

[Anchorman]

No don’t worry.  One of the parameters for high start up revs is air intake temp at 15C or higher at start up.  Mine is doing it virtually every time at the moment.  France is usually a good place for fuel and they sell high grade at virtually every garage.  Mine only ever has high grade fuel or branded fuel and Millers Eco Diesel.

I’ve got a pdf on this starting revs thing if I can just find it!

[xtrailman]

Or you could read my last post. 

[Anchorman]

Or you could read my last post. 

He started it ;-)

Maybe it was your post I read and not a PDF!

[Howard]

Hi,my CX5 also does this sort of revs on startup,it does seem to be an intermittent feature. It doesn't effect the drive from cold.
H

[xtrailman]

Hi,my CX5 also does this sort of revs on startup,it does seem to be an intermittent feature. It doesn't effect the drive from cold.
H

It's not really intermittent, that suggests a fault.
It will only rev providing the set conditions are met for it to operate as mentioned in the email from Mazda.

At least now I have the auto selecting rev immediately after starting drops the revs back to normal.

[Howard]

Hi, ok it happens now & again,there doesn't seem to be any set pattern. I think intermittent and sometimes are both the same. Either way it's always done it from new & seems to be part of the engine management design for what ever reason.
Howard

[ROCKETRON]

Yes mine has done this from new also, under certain conditions. I have always just put the auto in reverse with  the brake on and they immediately go down to normal, then its ok rest of the day..

[Southern Teuchter]

Yeah mine does this and always has from new.  I drive on it straight away and it typically returns to normal revs within 10-15 seconds.  Seemed like a pretty normal thing to do TBH.  Never worried about it.  LOL

[raypaice]

I pay £30 tax thanks to the SkyActiv efficiency and the high rev condition is a small, if annoying, price to pay.

[Topper]

Hi
new to forum and new to Mazda Cx5 too.

I actually only came on to find out if anyone else had this high rev on some start ups................... and it appears to be a normal thing.

Must admit it is a bit annoying when the weather is quite fine and warm and then everyone from work is looking at you and saying "summat wrong wi that lad"

Well nice to meet you all anyway

Tops

[Anchorman]

You have to consider why it is doing it. Mazda are obligated under legislation to keep emissions down. This revving is not a “fault” or an “issue”, it is an intentional design function to speed up the efficiency of the catalytic converter.  I’ve heard some people say that you can defeat it by putting it in gear!  Well done, all that does is extend the warm up and increase harmful emissions.  There is no need to fret about it.  Leave it alone and let it get on with it.

[raypaice]

My concern is that this process can dump unburnt fuel into the engine oil eventually requiring an oil change outside services. I have had this once anyone have similar experiences?

[Bert321]

My concern is that this process can dump unburnt fuel into the engine oil eventually requiring an oil change outside services. I have had this once anyone have similar experiences?

It's failed dpf regens that dump oil into the sump, not high revving on start up.