Post
by DaytonaRs4 » Tue May 20, 2014 4:00 pm
With a vac leak is it just that vac operated stuff like manifold and airbox flaps don't operate or does the actual loss of vacuum causing a problem elsewhere?[/quote]
Tony, yes a vac leak will causes a loss of power. If there is a break anywhere in the circuit then none of these items will operate as they should and in the case of the intake manifold flaps, the ECU will <beep> the timing to protect the engine and restrict power output. The intake manifold flaps, intake air change over flap and exhaust valves can all fail individually too. My Valve vac pipe came lose on one side and the whole car was like a dog - retarded timing. It's all interconnected and very symbiotic.
In my case the the low pressure or leak of the vac system will cause manifold flaps to tumble in a very lame fashion. I did the power flap test with
VCDS (
http://forum.rs246.com/viewtopic.php?t=77235) and I could see all the associated vac items 'up front' after building vacuum operate in a very 'lazy' fashion. The exhaust flaps rattled and were not positive in actualion. Re-connect the vac pipe to the exhaust valves and build vacuum again, ran test and all vac items were far more positive in actuation...[/quote]
great bit of info neil...should hear some feedback from autohaus in next day or so and will update on the culprit
2013 RS5 Phantom Black, MRC Stage 2 and TCU, Bilstein B16 IRC, 034 Arms, H&R ARB's, Milltek non res, ITG, 20” Ispiri FFR6 / PS4s, AP Radical 6 pot brakes / 390mm floaters, Pagid RSL1, JL Audio, EMtuning headlight build, Gtechniq ceramic and Llumar PPF
Gone: Daytona B7 RS4 saloon