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#1
16th July 2015, 08:53 AM
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Audi 2.4 V6 issues
My sisters partner has an A6 with the 2.4 V6 petrol lump.
Engine idle is all over the place, and the idle speed hunts up/down all time. The issue is more pronounced when cold, but is still there even when warmed up. Now I've hooked up VCDS and a scan shows a camshaft position sensor fault, which I hope is the cause of the idle speed surging. I also looked at the engine measuring blocks, and regular misfires are being reported against bank 1, but bank 2 is completely fine. You can sit with VCDS monitoring bank 1 and watch as the misfire count increases in line with the RPM changes. I can only hope that replacing the cam sensor will fix this, seems feasible if the sensor is giving the ECU rubbish info. No misfire fault codes are logged, but its difficult to diagnose because the engine light is always on as both Bank1 and Bank2 cats report below efficiency.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles 
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