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Idle RPM drops

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2.3K views 1 reply 2 participants last post by  trebor.corfield  
A
#1 ·
Hi All,

I own Astra K 1.4T and I’ve noticed that its RPM occasionally drops below their normal values while idling (from ~750 to ~650), and I feel a slight vibration through the seat. This usually happens on warm engine and I couldn’t see any other issues with my car - it starts and drives fine.

Please see my video showing this issue below - is this something I should be worried about?

 
T
#2 ·
Allianos said:
Hi All, I own Astra K 1.4T and I’ve noticed that its RPM occasionally drops below their normal values while idling (from ~750 to ~650), and I feel a slight vibration through the seat. This usually happens on warm engine and I couldn’t see any other issues with my car - it starts and drives fine. Please see my video showing this issue below - is this something I should be worried about?
Click to expand...
The RPM drops when the cooling fan starts and draws more current load from the alternator. Just a good sign that your cooling fan is working correctly.
 
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