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Old 03-27-2008, 09:52 PM   #1
DeZZar
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!Update! - Idle problem

said Id keep you guys informed on this so heres an update.

car went back to the dealership on Thursday for them to have another go at determining the cause of our problem.

The problem: (for the benefit of anyone that might have the same thing happen)
- after driving for some time the car would pick up revs to 1,000 or more whilst idle and stay there for a while, then drop back to only 8-850rpm. Never 600 like normal.
- this wouldn't happen everytime. but often enough to raise an alarm
- when the idle played up so did the dsg. you could feel the clutches slipping when attempting to take off rapidly, and you could feel the changes occuring like a normal automatic.


So the service department ran some tests and could not come up with any fault codes. They started tracing the electrical system and discovered that the earth grounding the battery was very very loose. (odd given I've never even seen the battery).

They think that what was happening was that the earth leakage was causing a voltage drop which the engine was attempting to compensate for. This then cofused the changing patterns for the dsg.

I am still a little dubious about how this could affect the dsg performance - it certainly doesn't seem to make any sense from how they described it.

Anyway - I've been for a few quick drives since and the car has behaved itself. So this may end up beging the answer.

So if anyone has and idle racing issues - check your battery!!
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Old 03-27-2008, 10:22 PM   #2
mrx
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Yes, a loose battery terminal will cause erratic idling, I've seen it on older cars, but didn't think to mention it - I thought the golf would have had enough smarts to log some sort of fault for that.
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Old 03-28-2008, 12:22 AM   #3
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Cool

Quote:
Originally Posted by mrx View Post
Yes, a loose battery terminal will cause erratic idling, I've seen it on older cars, but didn't think to mention it - I thought the golf would have had enough smarts to log some sort of fault for that.
Obviously not...go the 6spd! haha jks DSG is good but not for me!
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Old 03-28-2008, 01:41 AM   #4
DeZZar
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yeah the increase idle for a loose battery makes sense to me.....its the bit where this in turns plays havoc with the dsg that I'm confused about.

and the fact that the car didn't log a low voltage code or something is definitely odd.....

anyway....guess we'll see if its truly fixed after this weekend
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Old 03-28-2008, 01:59 AM   #5
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Well... The DSG has it's own control unit (needs power) and the gear changes are electronically actuated as far as I'm aware, so I can see inconsistent power supply could fuck around with it.

Fingers crossed that's all it was!
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Old 03-31-2008, 05:44 PM   #6
AKGT
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Which dealership did you go to?

I have the same problem with my GT.
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Old 04-01-2008, 01:51 AM   #7
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hi AKGT!

I took the car to Burwin Volkswagen. Here are their details.

Address: 700 Burwood Highway, Ferntree Gully VIC 3156
Phone (03) 9752 2844
Fax (03) 9752 3873

Hours Mon - Sat: 8:30 am - 6:00pm
Sun: CLOSED

this is my only experience with them. Weren't much help the first time round but they seem to have correctly identified the problem this time and I haven't had any issues since.

Hope its the same simple fix for yours. Let us know how you go!
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Old 04-01-2008, 01:57 AM   #8
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Great Update Dezzar. I would say that's a good troubleshooting know-how right there. I wonder how many VW dealerships would head down the same logic of finding where the issue lay.
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Old 04-01-2008, 02:05 AM   #9
AKGT
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Thumbs up

I will check under the bonnet tonight.

If I can't find anything obvious I'll take it to the dealer.

Thanks
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Old 04-01-2008, 05:06 AM   #10
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Checked under the bonnet - no loose wires on the battery or the grounding cable.

It looks like I need to book it in.
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Old 04-08-2008, 12:07 AM   #11
AKGT
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Took the car to St Yarra VW in Richmond.

They found two faults:
Supercharger clutch no opening (only happend twice) - only needed a software update;
Turbocharger overspead - can't clear the fault - they think it may be something to do with my AWE catback exhaust - bullshit if you ask me.

The idle speed is still arround 1000rpm - they not going to work on it until I put the standard exhaust on it.

I'll do it, but as far as I'm concerned it is a waste of time. The idle problem was there for arround 3 months. The exhaust was on the car for less than two weeks.

Is anyone else experiencing high idle speed.
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Old 04-08-2008, 01:53 AM   #12
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Quote:
Originally Posted by AKGT View Post

Is anyone else experiencing high idle speed.
I experienced it my MK4 GTi, it turned out to be a faulty idle valve. Could not detect it on VAG-COM
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