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Idle speed is to high (cold engine) AAY 2.5i

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GGHM View Drop Down
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Joined: 22 Jan 15
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GGHM Quote  Post ReplyReply Direct Link To This Post Topic: Idle speed is to high (cold engine) AAY 2.5i
    Posted: 10 Jul 17 at 15:17
Hi!

Since a few weeks I have a problem with the idle speed of my AAY (2.5i) with K-Jetronic.

If I start the cold(!) engine, the idle speed goes to 2000rpm. After ca. 10sec. the speed increases to ca. 2600rpm. If I drive the car ca. 500-1000m, the idle speed is around 1000rpm.

This happens only, if I start the cold engine.

I already cleaned the idle control valve with with break cleaner but nothing changed. 2000-2600rpm are a little bit to high.  ;-)

 

Any ideas?

 

Best regards,

Gunther

 

1983 Caravelle special edition - one of the first WBX
1993 Caravelle 2.5i from South Africa
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T3 Nev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T3 Nev Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 17 at 19:59
Hi,
Try beginning with the simple things first. Check all wiring and wiring plugs to the engine.
Try another idle control valve same as Audi 90/100.
Reset your base idle when the engine is hot +- 800rpm.
Hope this is of help.
Nev.
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marlinowner View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marlinowner Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jul 17 at 21:11
If you can get hold of Haynes Manual (or similar) for Audi 100 and 200 Oct 82 to 1990, H907014, that has details of the K-jetronic as used on the AAY engine, with details of cold start and warm-up valves.

Edited by marlinowner - 11 Jul 17 at 21:12
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GGHM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GGHM Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 17 at 21:00
Thanks for your reply. I found the fault.
I replaced the temperature switch on the bottom of the flange on the cylinder head. 
The switch tells the idle control circuit how to adjust the idling based on the engines temperature.
Now the engine runs perfect.   Smile
1983 Caravelle special edition - one of the first WBX
1993 Caravelle 2.5i from South Africa
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T3 Nev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote T3 Nev Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 17 at 21:42
Excellent. Thanks for letting us know.
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