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Misfire - Ignition Fault Or Fuel Problem?

electrical engine

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#1 derekaka2sheds

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Posted 01 April 2024 - 03:24 PM

I own 1965 Morris Mini Minor 848cc which is all original with the exception of electronic ignition. The car starts fine (using E5 fuel) but seems to have a misfire until properly warmed up which can take 10 minutes or so on the open road. The engine has a serious lack of power during this period and before taking any action on this would appreciate your comments and or advice. Thank you.

#2 bpirie1000

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Posted 02 April 2024 - 07:22 AM

How do the plugs look? Have you checked compression

#3 DeadSquare

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Posted 02 April 2024 - 09:46 AM

Misfires are usually electrical.  Flat spots are carb.


Edited by DeadSquare, 02 April 2024 - 01:08 PM.


#4 Lplus

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Posted 02 April 2024 - 12:03 PM

I own 1965 Morris Mini Minor 848cc which is all original with the exception of electronic ignition. The car starts fine (using E5 fuel) but seems to have a misfire until properly warmed up which can take 10 minutes or so on the open road. The engine has a serious lack of power during this period and before taking any action on this would appreciate your comments and or advice. Thank you.

What sort of misfire?  a regular misfire or a general random misfire?



#5 derekaka2sheds

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Posted 02 April 2024 - 06:05 PM

I would say a general random misfire which clears when the car is fully warmed up. Thanks

#6 Lplus

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Posted 02 April 2024 - 06:21 PM

First thought is running weak and needs to warm up before the mixture is right.  That said, duff plugs or poor ignition might also give that effect as the engine will run better with either or both when warm.



#7 derekaka2sheds

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Posted 02 April 2024 - 06:55 PM

Plugs look ok although only been on a few short runs after winter. Not checked compression as yet - are you thinking head gasket? Thanks for your replies.





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