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2006 Audi A6 3.2 Liter Runs Rough and pops, misses for 30 to 45 seconds, only with cold start up

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

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SOURCE: 85 trans am 305 mpfi rough idle at start

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

michigan man
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SOURCE: engine idles rough, misses at 2500-3000 rpm's

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

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SOURCE: 1995 Toyota camry Le 4C Missing Problem -

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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SOURCE: Car is running rough, afetr spark plug change

make sure no fuel is down in the spark plug ports it will short out the spark

Posted on Apr 15, 2009

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SOURCE: Rough idle and acceleration on 1998 Chevrolet Silverado 5.0

Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.


Posted on Jul 26, 2009

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