I installed cat-back OE exhaust which was found to have rattling noises; taken out and found carbon stones/pieces in left rear muffler which would not come out with any means. Decided to use high pressure water which solved the problem. Exhaust was re-installed this time without rattle, but now water was left inside, and when started cold for a 45 minute heat-up cycle, the idle is 810 rpm; after temp goes to 90, check engine light is on; apparently water turns to vapor and back pressure is present. Idle goes to 1000-1100 rpm. Upon revving, a moderate ammount of water is expeled out both exhaust tips. After several cycles problem persists. Check engine is now permanent, and upon revving, sometimes the oil pressure warning comes on. The car is shut immediately. Any suggestions as to what to do are greatly appreciated!! Best.
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) 2005.5 Audi S4
2011 Dieselgate Q7 TDI..... patiently waiting for my warranty to expire!!
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