thanks for your help.
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When you apply 12v you should hear the clunk of it opening (and no noise as it stays open) and as you remove the charge it should spring back closed.
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yes, that's exactly what it's doing; buzzing was a bit exaggerated; I just noticed it's "on" while it has 12V. My idle rpm is fine as well; engine runs fine, too, when it runs. On coldstart when I turn the ignition on it makes that clunk sound and after 30 (approx.) seconds it makes that clunk again and is "off" then. Is that the expected behaviour?
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I replaced the idle control valve and the two hoses connected to it
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I checked the hoses; they are fine; not like a brick.
I assume A0085423217 is the coolant temp sensor, right?
Btw. I replaced all my spark plugs yesterday; replaced the Beru Ultra something with Bosch ones. It still only starts with kickdown but much better and earlier. The Beru looked brownish and were in good condition but the distance between the electrodes were bigger compared to the Bosch ones.
I am going to replace the coolant temp sensor and will report.
Thanks for your quick help.
Kind regards,
Andreas.