Classic Audi Technical Mech/Tech Engine » Help - Idle Stabilisation valve, ABC Engine

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Old 04-07-17, 09:10 PM   #1
DGSdale
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Default Help - Idle Stabilisation valve, ABC Engine

Hello folks,
I've just ordered a new Idle Stabilisation Valve (part no. 078 133 455 D) for my 2.6 Cabriolet, ABC engine, year 2000. My question is, can I just bolt it in as received, connect the plug and of I go (with my fingers crossed in the hope that it will cure the 1100 - 1200 rpm Idle). The reason I ask is that Elsawin states: "After installation, ISV must be moved to basic position in 'Basic Settings' function". I do have VCDS (or a version of it) but am unsure how to do this and don't want to start messing without the knowledge. If anyone can help I would be very grateful.
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Old 04-07-17, 09:16 PM   #2
Colin Aitchison
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Hi, What is your idle problem, dose the engine idle speed jump about - 1000 to 1200 to 1000 to 1200 rpm and so on when warm?
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Old 04-07-17, 09:38 PM   #3
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Originally Posted by DGSdale View Post
Hello folks,
I've just ordered a new Idle Stabilisation Valve (part no. 078 133 455 D) for my 2.6 Cabriolet, ABC engine, year 2000. My question is, can I just bolt it in as received, connect the plug and of I go (with my fingers crossed in the hope that it will cure the 1100 - 1200 rpm Idle). The reason I ask is that Elsawin states: "After installation, ISV must be moved to basic position in 'Basic Settings' function". I do have VCDS (or a version of it) but am unsure how to do this and don't want to start messing without the knowledge. If anyone can help I would be very grateful.
It could be your problem but so could the coolant temperature sensor be messing with your rpms.

Here's a few pages i cut out of Car Mechanics mag years ago that highlighted the usual problems with these engines.








Last edited by vorsprung durch technik; 04-07-17 at 09:40 PM.
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Old 04-07-17, 09:39 PM   #4
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It's an intermittent problem but getting more often than not. I have seen it drop quite low and back up a couple of times but most of the time it's at a steady 1200rpm. I've checked all that I can and I researched it a lot and I'm fairly confident it could be the ISV!
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2008 B7 S4 4.2 V8 Cabriolet - Moro Blue - Current
2005 B6 A4 3.0 Sport Cabriolet - Moro Blue - sold
2000 B4 80 2.6 Cabriolet Final Edition - Ming Blue - sold - & missed
2003 C5 A6 3.0 quattro Avant - Night Blue - current
1998 C5 A6 2.8 quattro Avant - Ming Blue - sold
1994 B4 80 2.6SE Avant - Indigo Pearl - sold - & missed
1993 B4 80 2.0 16V Sport - Gomera Green - sold

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Old 04-07-17, 09:44 PM   #5
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Thanks VDT, I've read those pages (numerous times!) having printed them out from a previous time you posted them. I checked out the Coolant Temp Sensor and it appears to be exactly as it should with the resistance dropping with the increase in temp.
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2008 B7 S4 4.2 V8 Cabriolet - Moro Blue - Current
2005 B6 A4 3.0 Sport Cabriolet - Moro Blue - sold
2000 B4 80 2.6 Cabriolet Final Edition - Ming Blue - sold - & missed
2003 C5 A6 3.0 quattro Avant - Night Blue - current
1998 C5 A6 2.8 quattro Avant - Ming Blue - sold
1994 B4 80 2.6SE Avant - Indigo Pearl - sold - & missed
1993 B4 80 2.0 16V Sport - Gomera Green - sold
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Old 04-07-17, 10:00 PM   #6
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Originally Posted by DGSdale View Post
Thanks VDT, I've read those pages (numerous times!) having printed them out from a previous time you posted them. I checked out the Coolant Temp Sensor and it appears to be exactly as it should with the resistance dropping with the increase in temp.
Ha,someone taking notice. That's a good thing that you ruled that out then. I'm guessing the idle stabilizer valve is expensive from audi?
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Old 04-07-17, 10:21 PM   #7
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It was obsoleted by mainstream Audi - so I'm told - on 1st April this year. Tradition have it but they are only listing the part no. without the D on the end. Apparently my chassis no. requires the D. I've ordered a VDO item that corresponds to the correct part no. from a factors for a few pence under 75. They can be had for a lot less but you pays yer money....
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2005 B6 A4 3.0 Sport Cabriolet - Moro Blue - sold
2000 B4 80 2.6 Cabriolet Final Edition - Ming Blue - sold - & missed
2003 C5 A6 3.0 quattro Avant - Night Blue - current
1998 C5 A6 2.8 quattro Avant - Ming Blue - sold
1994 B4 80 2.6SE Avant - Indigo Pearl - sold - & missed
1993 B4 80 2.0 16V Sport - Gomera Green - sold
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Old 04-07-17, 10:25 PM   #8
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Ok,thats not too bad a price i seams to remember when i asked Audi about this part years ago it was around 100.
Best of luck with it and let us know if she's purring again.
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Old 05-04-18, 09:43 PM   #9
Flying Frank
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Hi, what was the final outcome / cure for the V6 ABC engine problem ?
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Old 06-04-18, 06:26 AM   #10
DGSdale
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The ISV was replaced - quick and easy to do, it's only two socket cap head screws and one electrical connector although a ball ended Allen key is very useful and do use a new O ring - but it needs to be put in the basic position using VCDS. This is also very quick and easy - as long as you have VCDS and the adaptor leads! Once I'd done this the problem was sorted and the car idled and drove superbly. The old Valve that came out had a date sticker on it and was only about three years old.
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2008 B7 S4 4.2 V8 Cabriolet - Moro Blue - Current
2005 B6 A4 3.0 Sport Cabriolet - Moro Blue - sold
2000 B4 80 2.6 Cabriolet Final Edition - Ming Blue - sold - & missed
2003 C5 A6 3.0 quattro Avant - Night Blue - current
1998 C5 A6 2.8 quattro Avant - Ming Blue - sold
1994 B4 80 2.6SE Avant - Indigo Pearl - sold - & missed
1993 B4 80 2.0 16V Sport - Gomera Green - sold

Last edited by DGSdale; 06-04-18 at 06:35 AM.
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