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What might cause a car with a manual transmission that in 5th gear when given a punch of gas revs to very high rpms – with no power transferred to the wheels (i.e. the tachometer and speed go out of sync).

For illustration (and I'm making these numbers up), at around 2000 rpm on the tachometer, and going 60km/h "punching" the gas causes the tachometer to hit 4500 rpm yet the speed remains at 60km/h.

I would expect the revs to remain at a constant ratio to the speed, so I'm wondering what might be going wrong.

My first suspicion is a problem with the clutch, but I was wondering how I may test this or suggestions as to what else it may be.

The car I'm thinking of in question has only around 27,000 km on it, which seems like a very short lifespan for a clutch!

Thanks for reading, appreciate any insight.

DucatiKiller
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Brian M. Hunt
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2 Answers2

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It sounds like the clutch is worn out... You can usually tell by gradually applying the gas in the top gear, probably around 2,500 RPM, and the car should accelerate a little bit, but at some point as you press the gas further and further down, you will feel it release and the revolutions will shoot way up without road speed increasing.

It basically feels like you have pressed in the clutch while it was accelerating...

Can it happen on a car with only 27,000km on it? Absolutely... The first car I had I destroyed the clutch, put a brand new clutch in, and that one was doing the same thing you describe after another 12,000 miles. It just depends on how the clutch is operated. One of my current cars (it's now 25 years later) we bought new and just turned over 199,000 miles on the original clutch. Obviously, I've learned a thing or two since that first car. :-)

Sean Reifschneider
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If no power is transfered at all, the gear box is probably broken.

If any some is transfered (and there are no noisy metallic sounds :), it's probably the clutch. There should'n really be anything else that can slide.

jkj
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