Mazda CX-5 Forums

Technical Section => Engine/Transmission/Powertrain/Exhaust => Topic started by: WIZZ on May 24, 2018, 12:49:29 pm

Title: Fast idle on first start
Post by: WIZZ on May 24, 2018, 12:49:29 pm
Anyone else had this?
Title: Re: Fast idle on first start
Post by: Deeps on May 24, 2018, 12:54:36 pm
Anyone else had this?

Yes, I suspect just about everyone of us diesel owners. It's quite normal so nothing to panic about.
Title: Re: Fast idle on first start
Post by: WIZZ on May 24, 2018, 01:16:12 pm
Yeh, with you, but I've had the car a year & it has just started doing it ?? petrol engine cold start, for sure.
Title: Re: Fast idle on first start
Post by: Deeps on May 24, 2018, 01:39:33 pm
On some days mine fast idles quite noticeably whilst on other days not. I suspect it's dependent upon several factors e.g. temperature and humidity driven by the requirement to meet strict exhaust emissions and hence get the engine up and running optimally in as short a time as possible. Only Mazda know for sure but as said earlier, it's a well known and documented event.
Title: Re: Fast idle on first start
Post by: twabrigs on May 24, 2018, 03:07:01 pm
As Deeps says it's perfectly normal, but only happens under some obscure combination of circumstances possibly involving phases of the moon.

Seems odd you've never had it up to now though.
Title: Re: Fast idle on first start
Post by: howardsathome on May 24, 2018, 04:31:40 pm
My diesel has always done this over the last 5 years, there does not seem to be any 'normal' conditions that cause it to not occur. This week (cold first thing then warmer later), it starts up fast when backing out of the garage and is back on normal tick-over by the time the doors have closed.
Title: Re: Fast idle on first start
Post by: Bert321 on May 25, 2018, 12:28:24 pm
 Mine does it most often on cold starts when the ambient air temp is in the low to mid teens.
Title: Re: Fast idle on first start
Post by: Anchorman on June 08, 2018, 06:53:19 am
I can’t believe this question gets asked so often. I have this pdf pinned on the U.K. CX-5 owners Facebook page. It shows all the conditions that raise the idle speed.
Title: Re: Fast idle on first start
Post by: BigAl on June 11, 2018, 12:13:35 pm
U.K. CX-5 owners Facebook page.

Hadn't seen that group, will be over shortly...

Alan
Title: Re: Fast idle on first start
Post by: Anchorman on June 15, 2018, 10:46:28 pm
U.K. CX-5 owners Facebook page.

Hadn't seen that group, will be over shortly...

Alan

You’ll be made most welcome.