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How do I check clutch ?

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Old Feb 2, 2017 | 09:37 AM
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Default How do I check clutch ?

I have a 2008 ZO6 that I bought new. It now has 90,000 miles on it.

Lately I have noticed a hesitation when accelerating medium to hard.

At first I thought it might be plugs or wires. No check engine light, no codes, nothing when driving with a monitor hooked up. I changed the plugs and wires anyway and the engine runs really good but I still notice this hesitation on acceleration.

It doesn't always do it and it isn't always at the same rpm or throttle position. I suspect that maybe the clutch is wearing out. Is there a way I can check the clutch condition without pulling the whole thing out ?
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Old Feb 2, 2017 | 11:11 AM
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A quick and dirty test would be to put it in a high gear at a low mph (like 5th at 30 mph) and floor it to see if the clutch slips.
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Old Feb 2, 2017 | 03:41 PM
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And hesitation is not really a symptom of a clutch going south. Slipping is that symptom. So unless you hear/feel the engine rpm go up when this hesitation happens, it's not the clutch.
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Old Feb 2, 2017 | 04:19 PM
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Yeah, symptoms don't really match. Slipping = RPM's will shoot up but you don't accelerate at the same rate.
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Old Feb 2, 2017 | 05:49 PM
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Originally Posted by sevinn
A quick and dirty test would be to put it in a high gear at a low mph (like 5th at 30 mph) and floor it to see if the clutch slips.
and sometime accompanied by a burnt odor like when sometimes you get behind a tractor trailer with brakes dragging.
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Old Feb 2, 2017 | 09:45 PM
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Yup, a slipping clutch smells like burning brakes...very expensive brakes.
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Old Feb 3, 2017 | 11:14 AM
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Originally Posted by sevinn
A quick and dirty test would be to put it in a high gear at a low mph (like 5th at 30 mph) and floor it to see if the clutch slips.
I took a ride this morning and tried your suggestion.

No slippage. I guess it must be something else.

I'll keep looking.

Thanks for your suggestion.
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Old Feb 3, 2017 | 11:16 AM
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Originally Posted by LEJ ZO6
I took a ride this morning and tried your suggestion.

No slippage. I guess it must be something else.

I'll keep looking.

Thanks for your suggestion.
Glad to hear it didn't slip for you. It isn't a guaranteed clutch is good/bad test but it will normally tell you if one is definitely bad. I always get very nervous before running that test

I think you should do some data logging to see what's going on with the hesitation. Could be something as simple as a dirty throttle body sticking.

Last edited by sevinn; Feb 3, 2017 at 11:17 AM.
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Old Feb 3, 2017 | 11:42 AM
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Originally Posted by sevinn

I think you should do some data logging to see what's going on with the hesitation. Could be something as simple as a dirty throttle body sticking.
Yea, I forgot to mention it but the dealership ran a compression test and cleaned the intake and injectors while it was in for plugs and wires.

Of course that was an additional charge.
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Old Feb 5, 2017 | 12:00 AM
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Originally Posted by LEJ ZO6
Yea, I forgot to mention it but the dealership ran a compression test and cleaned the intake and injectors while it was in for plugs and wires.

Of course that was an additional charge.
if the problem started after they worked on it, it almost guaranteed they messed up something..
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