Question about 2006 Audi A6
Originally vehicle had a CEL on, found a broken plastic vacuum line to the intake manifold by cylinder head on bank two. There was a related TSB to the issue. Replaced broken line and cleared faults, set readiness car ran fine. Two weeks later customer returns with a rough running, missing/popping issue only at cold start up for about 30-45 seconds, won't take throttle properly. Than car runs fine, does not miss re-starts fine. I have replaced the spark plugs, the low pressure fuel switch, removed the upper intake manifold checked for other broken vac. lines were o.k., checked operation of manifold flap diaphragms(o.k.) cleaned intake valves of carbon, cleaned the throttle body, performed a capacity discharge on the battery, ran throttle adaption and fuel pressure adaption. Car shows evidence of running rich old plugs were black with soot. Don't think it is a lifter issue(not pumping up) as per TSB. Issue remains, I use the VCDS scan tool by Ross-Tech for my info. Any ideas would be greatly appreciated. Thanks, Chris
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Posted on Jan 02, 2017
check your Temp sensor for the ecu. could be out of spec at lower temps but not enough to send a code "You know -40 is possible and won't send a code"
Posted on Nov 12, 2008
i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth
Posted on Feb 14, 2009
i have came across simler problems in the past so im going to give you a list of four main suspects number 1; a broken or pereshed vacuum hose at the trottle body or inlet manifold.2 a blocked injector 3 a fuel injection system fault 4 a disconnected /leaking or perished crankcase ventilation hose.Before you try any of these by a can of fuel cleaner and run it through your system remember a small piece of dirt half the size of grain of salt is enough to cause this problem good luck.adrian
Posted on Feb 16, 2009
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