High Revs Start up

[devonlad66]

Hi folks is it normal when starting engine in mornings the revs are 1500rpms

It settles down when driving and stopping at junctions.

Was just wondering whether a new MAF sensor could do with replacing

Just bought the car. Advensis 2.0 vvti Petrol 2002

[mrfixer]

Yes. Toyotas have fast idle on cold start. Should drop back to less than 900rpm after a few minutes.

[Konrad C]

Normal start up with other Toyota engine designs, before 7A-FE 1.8 leanburn and 2ZR-FAE 1.8 Valvematic before and after the 1ZZ 1.8. Yes normal, especially in the cold to get the engine to operating temperature quickly.  

[Devonlad1966]

Please can I ask is it worth removing the Mass Air Flow sensor on the Advensis and giving it a clean.  Just wondering where you would find it

[Noi]

2007, 1AZ-FSE, even in warm weather it's high revs on cold start.

[Diamondback]

Both mine and my wife's Toyotas do this it's fine. I thought it seemed odd at first

[Gerg]

I have a strong suspicion that the high revs on a cold start are an attempt to get the catalyst up to working temperature ( around 600 centigrade?) as quickly as possible, so as to meet exhaust emissions targets. The hot, spent exhaust gases are all it has to heat it up.