04 V6 Mysterious Voltage Drop at Idle - Club Touareg Forums
 
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post #1 of 3 Old 04-22-2015 Thread Starter
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04 V6 Mysterious Voltage Drop at Idle

Hello
I would appreciate any help on the following failure. It is most obvious at night with the headlights on after I have been driving and pull up to a stop / idle.

Symptoms :
-Voltage Drop 0.5-1V and RPM drop, then recovers to 14V; AND
- Lights dimming; AND
- Strange noise coming from Kombi valve / Throttle Body Controller area with vibration along the stainless steel secondary air tube.

I have read about the cable from the alternator to the +'ve Busbar and so I cleaned all the Busbar terminals, etc.

I am thinking it could be alternator problem and/or EGR/combi valve and/or Throttle Body.

Any ideas?

Thanks
Ben.
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post #2 of 3 Old 04-22-2015
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Scan with vcds (vag com) and see if there are any codes.

If the RPM drop and Voltage Drops are concurrent, then I would think that it is not the alternator. That something is making the engine stumble which drops the alternator output.

Could check and clean egr valve. They always crud up on the V8. Could check the throttle body. But what would be best is to pull codes first.
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post #3 of 3 Old 05-17-2015 Thread Starter
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Hello. I scanned and got no codes.
I removed the vacuum hose from the top of the combi valve and the squeaking sound that accompanies the voltage drop had gone. ......HOWEVER i still get the voltage drop. Any ideas?
Thanks.
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