• Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


Recommended Posts

Hi SAU,

My R33 (RB25DET) timing starts fluctuating at idle. Bigger problem IS when boosting, A/F Ratio went very lean!

Need help, please....!

Here In Finland anyone knows IS It CAS or what? (bc We don't share information) 😜

 Stock r33 Inc.

HKS airduct

3 " catback exhaust

Cusco coilovers

Impul strutbar

gauges at idle R33 Skyline.PNG

ecutalk parametres.PNG

ecutalk2 parametres.PNG

Share this post


Link to post
Share on other sites

At idle it is more likely to be caused by the ECU using timing to control idle speed.  This happens when the IACV is too gummed up to work.

It could be that the CAS is buggered.  Bearing wear and shaft wobble make it impossible for the CAS to work properly.

Share this post


Link to post
Share on other sites

Thank you. I am 99.9% sure that it is a CAS failure. Now I got the assurance. Can you tell why A / F Ratio goes to the lean at full throtle? Timing drops below or too few gas pressure?

Thanks A lot 😀

Share this post


Link to post
Share on other sites

Lean mixtures almost certainly from lack of fuel supply.  Beyond that, no I can't tell you.  Put a fuel pressure gauge on it and load it up, see what it says.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now