High Revs at start, calms down to normal after 10-20 seconds

Post by **packetfire** » 14 May 2016, 23:21

My new to me 2004 v70 2.4 non-turbo....

No DTCs at all in VIDA - a completely fault-free car at 142K

But when I turn the key and start it, it revs up to 2K rpm, and can take 10 - 20 seconds to drop back down to a normal idle rpm of 700-800 rpms.

My 2001 never did that.

But, like I said, no codes... Maybe a sticky throttle that needs some cleaning? But wouldn't that throw me a code?

Post by **abscate** » 15 May 2016, 02:59

Welcome to the P2 forum and world!

The Denso ( I think) management system in the P2 does this to help heat the O2 sensor.

I use those 20 seconds to roll my ...eyes.

It's normal operation.

Post by **packetfire** » 15 May 2016, 07:20

But if that is normal, what would have prevented my 2001 v70 from doing this same thing?

My 2001 v70 NEVER did this, not ever.

The only difference between the two cars is that the 2001 was turbo, while the 2004 is not.

Post by **JRL** » 15 May 2016, 08:06

Because something perhaps was never right in your 01 plus settings change from year to year for emissions

Post by **abscate** » 15 May 2016, 10:35

There are huge differences between non turbo and turbo engine management

My 1999 does not high idle, goes right to 750
My 2005 high idles just like post 1.... At least it was last time I could pry it from SWMBO

Post by **MadeInJapan** » 15 May 2016, 20:30

I would not worry about it unless there is some other issue with you car and you think this might be related.

Post by **MadeInJapan** » 15 May 2016, 20:30

I would not worry about it unless there is some other issue with you car and you think this might be related. Our '04 V70 I think does that too but we've been driving it for years so I don't really pay attention to it.