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Old 04-01-2020, 08:48 PM   #1
Join Date: Apr 2020
Location: Canada
Posts: 1
Can a bad clutch cause misfire

Hello guys.
Can a bad clutch cause misfire.
I have a 1997 base boxster with 5 speed manual transmission. I bought the car recently and mechanically was not in good shape. Clutch went to the floor soft once and I drove all the way home in 3rd gear. I then flushed clutch and brakes, put new spark plugs, coils, and change air filter. Car came to life and was driving good for 7K KM but recently clutch went out again and soft. The gear did not engage or disengage even pulling and pushing hard on gear. I then disconnected the battery thinking it might help rest computer and other electronics hoping clutch comes back to life. After reconnecting battery, I put the car in 3rd gear and started the engine while pushing on gas pedal and car started misfiring. The engine was perfect before the clutch went out and before I disconnected the battery. I have checked the oxygen sensors and all plugs and coils and all look good. I get misfire on 4, 5, 6 and the car dies after 15 to 30 seconds. I am thinking the cause of misfire is clutch. The car is in neutral and even without pressing on clutch, it starts and runs for few second and then dies. It could be the flywheel is stuck preventing the engine from spinning properly. The car appears to have the original clutch. The car currently has 120K KM or 75K miles. Please advise. Thanks

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Old 04-02-2020, 03:58 AM   #2
1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 1,915
Welcome to the forum.

Have you considered posting your inquiry in the general forum? Likely you'll have better luck receiving responses.

You then can return to the New Member Introductions forum to tell us more about you and your car.
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
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Old 04-02-2020, 04:19 AM   #3
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Join Date: Mar 2018
Location: Utah
Posts: 2,048
Short answer: no. A bad clutch will not cause a misfire.

You've got several things going on here in your explanation of symptoms.

My guess? Disconnect your MAF sensor and see if it smooths out and runs. If it does, we've learned something.

In the meantime:
That you bled your clutch and then it worked fine for 7k, (that's 7000, not 7km, right? ) and then it suddenly exhibited same problem, well, that suggests you're on to something. But that the car starts without pushing the clutch down, well that suggests someone's been in there before you.

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Last edited by maytag; 04-02-2020 at 05:21 AM.
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Old 04-02-2020, 06:08 AM   #4
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Posts: 1,444
Removing your battery could reset the air fuel mix values in the ECU. If they were off quite a bit as matag suggested by a bad,failing MAF this might make the engine idle poorly for a number of miles. The pedal being soft after a fluid change and flush. If this is the same as when you purchase the car you could have a failing clutch cylinder or lines to it. Some how air must be getting into the system, if it's not affecting the brakes it is only in the clutch circuit, and most likely closer to the transmission.

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