I have a 1.8 2006 Veauxhall Vectra Design which I feel is a nice car!!
I'm having a problem though when I change gear. When I depress the clutch the revs go up (slightly) and stay high for what seems 1 or 2 seconds too long before the revs then dip.
Any tips or suggestions on what could be a cause?
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Quite normal, its to make for smoother changes.
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I have heard of mechanisms to retard engine rev decay in the interests of reducing emissions, but what you describe started happening abnormally to the Vectra 2.5V6 GSi Estate that I used to drive. Repeated here in case worth a punt with your 1.8, the cause was the throttle butterfly valve sticking in the throttle body bore due to gummy deposits. Knotty Green Vauxhall in Penn (a plug for this superb small dealership) rectified whilst I waited and without appointment, at no cost; solution was to remove the induction pipe from the air filter case, squirt "carburettor" cleaner , carefully wipe, and then check that the butterfly was correctly aligned. Job done, and revs correctly dropped on demand again.
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To add; if a 2006 1.8 Vectra is "drive by wire" (I suspect it is) then my simple cause is less likely to apply and the initial sentence perhaps more likely. I hope not, as I dislike the intertia of large heavy flywheels (I perfer to compensate myself than rely on intertia to mask reality and drag me out of a lazy situation) let alone artifical methods that make it even worse in the "interests" of something else!
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What if you back off the accelerator more gently before you depress the clutch, or release the accelerator completely and then depress the clutch?
Maybe the system is just slow to respond to you releasing the accelerator.
If you think its a fault try a few other cars with the same engine to see if they exibit the same feature, then you'd know if yours has a fault of if its normal.
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