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 cylinder 3 misfire

 Created by: Misfire
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 Posted: Mar 14, 2019 09:40AM
Total posts: 1369
Last post: Mar 19, 2019
Member since:Dec 29, 2004
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Quote:
Originally Posted by Misfire
It is idling quite roughly. I did switch the coil packs to check, but it made no difference. Do you need to replace the whole valve cover or can you just replace the gaskets? Thanks for your reply.
Yes, you can replace just the valve cover gasket, here is the factory replacement.

One thing you might try, remove the camshaft position sensors (x2) and try cleaning them before re-installing. I have read posts where this cleared up the P0303 Misfire 3 error. These sensors are located at the right end of the valve cover as you look at the engine.

 Posted: Mar 14, 2019 04:51AM
Total posts: 2
Last post: Mar 14, 2019
Member since:Mar 13, 2019
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It is idling quite roughly. I did switch the coil packs to check, but it made no difference. Do you need to replace the whole valve cover or can you just replace the gaskets? Thanks for your reply.

 Posted: Mar 14, 2019 04:45AM
Total posts: 1369
Last post: Mar 19, 2019
Member since:Dec 29, 2004
Cars in Garage: 1
Photos: 9
WorkBench Posts: 0
Quote:
Originally Posted by Misfire
Hi everyone, I'm looking for a little help with my 2009 Cooper Hardtop base. I have recently had the check engine light come on and the resulting  odb code was for a misfire on cylinder 3. I tried swapping coils to see if one was bad, but there was no effect. I pulled the spark plugs and switched them as well to see if that made any difference, but no luck. One thing that I noticed when removing the spark plugs was that the one from what I assume is cylinder 3 had a lot of oil on the threads when I pulled it out. Does anyone have any ideas for what my issue might be? Appreciate any help or advice I can get. Hope to be back motoring soon. Thanks.
Is the engine idling roughly with the CEL?

Did you try moving the coil to see if the error code changes?

You may need to replace the valve cover gasket set to stop the oil getting into the plug well....

 Posted: Mar 13, 2019 06:00PM
Total posts: 2
Last post: Mar 14, 2019
Member since:Mar 13, 2019
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Hi everyone, I'm looking for a little help with my 2009 Cooper Hardtop base. I have recently had the check engine light come on and the resulting  odb code was for a misfire on cylinder 3. I tried swapping coils to see if one was bad, but there was no effect. I pulled the spark plugs and switched them as well to see if that made any difference, but no luck. One thing that I noticed when removing the spark plugs was that the one from what I assume is cylinder 3 had a lot of oil on the threads when I pulled it out. Does anyone have any ideas for what my issue might be? Appreciate any help or advice I can get. Hope to be back motoring soon. Thanks.