Vvti 2.0 Revs Increase During Gearchange

[tgoacher]

This is my first post...so here goes.....

I've just bought a 03 2.0 VVTi and love the car...but revs seem to increase whilst changing gear during acceleration. i.e. As I take my foot off the throttle with the cluth depressed, the revs seem to go up.

This does not happen with the engine not under load.

I've read in the forums of one other person experiencing this...is it a feature of the VVTi (and I need to change my technique), or is there a problem. (I've got a limited warranty with it and need to claim ASAP if there is an issue).

Thansk in advance,

Tony

[IanXT4]

Hi Tony

I had the exact same problem when I first bought my RAV which also has a 2.0 VVTi

I did a lot of searching on the internet and discovered that its a common "feature" of modern low emission engines.

Basically I believe when you suddenly remove your foot from the throttle the electronic control unit "lets the engine down slowly" so you maximise combustion and reduce emissions.

Good news is that after a while your driving just adjusts and now I rarely ever notice it in day to day driving.

Hope this helps

Regards

Ian

[matty2767]

is it because your engine hasnt warmed up?

[Ray99]

Hi Tony

What you're decribing is quite common with an engine which has no throttle cable. That is the throttle butterfly is operated by an electric motor, driven by the engine control unit. Check under your bonnet, look for the air filter- oblong black box with a couple of clips at the end and a large trunk coming out towards the engine. Where this trunk joins the engine, look for a throttle cable, a bit like a pushbike brake cable, that goes back towards the driver's side bulkhead. If there is no cable then you have the "fly by wire" throttle control system. This is a variable resistance that measures the position of the throttle pedal and tells the ECU how much power the driver is demanding. This is translated into an amount of butterfly angle. While the system is fast, it is still sending the throttle open signal to the butterfly for a few milliseconds after you have released the throttle and dipped the clutch, hence the engine revs rise (flare). The trick is to wait just a split second after you have released the throttle before you dip the clutch. Hope this helps. Regards Ray

[tgoacher]

Thanks for everyones replies. I had only driven it a few times when I made the post, and I have now modified my technique and all seems (to be bcoming) well. I'm happy for it to be a 'feature'.....I can just get on with enjoying a what I think is a superb car!!