VR6 high dipping idle with voltage drop

**Golf Houso** · 20-04-2009, 09:30 PM

I've been having a small problem with my VR6, where it occasionally develops a higher idle (780-800rpm) which rises and falls i.e. thrumm .... thrumm .... thrum and with that i have noticed that the voltage on seems to be dropping as the rpm drops as I can see from the dash and tacho's which dip slightly every time it falls.

Anyone have any suggestions to what it could be? I'm getting new leads this week, but I doubt they're related.

Cheers, Branko.

**The_Hawk** · 20-04-2009, 09:47 PM

Is it when you have the indicators on... and is in time?

Mine does that when the lights + indicators are on sometimes. The auto elec seems to think it might be like alot of BMW's with a sensitive voltage sensor, basically it senses a drop when the light blinks, so raises the revs, voltage goes up, the lights blinks off, voltage drop so so do revs... repeat...

does that make sense?

Everything seems to work fine and there is no dip in lights if I manually raise the revs so it sounds like he might be onto something.

Personally I think it might also be a battery in need of a good charge that doesn't help the situation too.

**Golf Houso** · 20-04-2009, 09:49 PM

Originally Posted by The_Hawk

Is it when you have the indicators on... and is in time?

Mine does that when the lights + indicators are on sometimes. The auto elec seems to think it might be like alot of BMW's with a sensitive voltage sensor, basically it senses a drop when the light blinks, so raises the revs, voltage goes up, the lights blinks off, voltage drop so so do revs... repeat...

does that make sense?

Everything seems to work fine and there is no dip in lights if I manually raise the revs so it sounds like he might be onto something.

Personally I think it might also be a battery in need of a good charge that doesn't help the situation too.

That does make sense actually Aaron, the battery is new though and I'll have another go at it later when I take it for a drive tomorrow. I honestly thought it was the voltage regulator on the alternator or something...

**MattyT** · 20-04-2009, 10:26 PM

800rpm is high idle? Mine sits at 1k no matter what!

**Golf Houso** · 20-04-2009, 10:31 PM

Originally Posted by MattyT

800rpm is high idle? Mine sits at 1k no matter what!

What the? Mines on a average idle of 630 and is very stable, except when it misses (new leads on the way) or when that volatge problem occurs.

You must have one seriously loud VR6

**skoota** · 20-04-2009, 11:02 PM

i have the same issue with my vr6.
would love to know what's causing it

**william** · 20-04-2009, 11:36 PM

600 is a low idle it should be 800 adjust your idle on the throtlle body there an adjustable 13m nut crack it and wind the tread up. If that doesnt fix it i would say you have a misfire most likely a dodgie lead bring it down il have a look at it

**Golf Houso** · 20-04-2009, 11:46 PM

Originally Posted by william

600 is a low idle it should be 800 adjust your idle on the throtlle body there an adjustable 13m nut crack it and wind the tread up. If that doesnt fix it i would say you have a misfire most likely a dodgie lead bring it down il have a look at it

Oh righto, I'll have a look at it. I've got 3 dodgy leads, they're all going lol. Thanks for the offer though William

!

**william** · 20-04-2009, 11:50 PM

Originally Posted by Golf Houso

Oh righto, I'll have a look at it. I've got 3 dodgy leads, they're all going lol. Thanks for the offer though William

!

il have a look in the garage i may have some old black leads they would work better than your current ones.. new bremi ones from south yarra in alexandria are 200 odd have a look on the net also