excellon

RPMs go back to idle ... I do have a VAG available - what to log?

excellon

I will double check today... and pressure test again

JasonS4+Festicle

The tear is usually under one of the clamps (more often the largest one closest to the throttle body)...

also, do you have an F-hose - check that too.

Mike2kS4

though.

I'd just replace it proactively anyhow, It's $11 or something silly.

JMS-Four

This happened to me after replacing my TBB. Turns out, clamps weren't tight enough.

Mark P

those would be the first things I'd look at to see if boost is meeting it's desired values, and to see if the throttle angle is following what the pedal is telling it to do.

Here's what you might see from the above - these are two separate graphs from different cars/logs, but just wanted to illustrate what you might see...

Actual boost is meeting requested:
<img src="http://ctny.audiworld.com/mark/s4/ecux/graphs/boost_psi.GIF">

showing throttle cut - throttle plate is doing different than pedal says to do:
<img src="http://ctny.audiworld.com/mark/s4/ecux/graphs/throttle.gif">

Mike2kS4

I'd liken a TBB problem to a momentary stumble.

excellon

No F-Hose... 01.5 - i'll take off my TBB completely ... BTW, its a SAMCO TBB

excellon

He had a A4 though, but he e-mailed and told me he solved his problem by changing his CAT. It was falling apart and was messing with his o2 sensor...

Does that sound reasonable? Anyway to check Cats besides dropping them?

Fairfax 4.0T

Hope you're not using stock clamps with the Samco. They are too big for the intercooler pipes.