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Trev has developed a misfire
Posted: Sat Apr 17, 2010 7:50 pm
by sgray
Part of the reason for doing a service today was to get rid of a misfire that's appeared .
Whilst he's not conking out, there is a misfire in all gears and when idling. Today I changed the oil and plug and put a new air filter on (there wasn't one before). I checked the points too (which were replaced last month). The fuel pump is ticking away as before though I haven't checked the filter yet.
The coil was replaced last month too. Can someone give me a quick list of things to check that might cause a fairly regular misfire?
Simon
Re: Trev has developed a misfire
Posted: Sat Apr 17, 2010 7:55 pm
by aupickup
timing or valve gaps
Re: Trev has developed a misfire
Posted: Sat Apr 17, 2010 8:12 pm
by alex_holden
Was it misfiring before you replaced the coil?
Re: Trev has developed a misfire
Posted: Sat Apr 17, 2010 8:18 pm
by sgray
alex_holden wrote:Was it misfiring before you replaced the coil?
Yes, it was terrible before I replaced the coil and that fixed it completely - has been fine for about 6 weeks. But before it was causing me to break down. This is more regular somehow.
Re: Trev has developed a misfire
Posted: Sat Apr 17, 2010 9:55 pm
by mike.perry
Coil again, condensor, dodgy fuel?
Loose electrical connection, rotor arm.
Try to get it fixed before next Sunday's drive
Re: Trev has developed a misfire
Posted: Sun Apr 18, 2010 10:55 am
by chickenjohn
Condensor, if not that then do a compression test- could be a slightly chipped exhaust valve giving a slight miss.
Re: Trev has developed a misfire
Posted: Mon Apr 19, 2010 6:43 pm
by sgray
Thanks guys - it was.... the condenser
she's now running as smooth as a .. well, something smooth..
will now return the condenser to Bull Motif - only 8 weeks old
Re: Trev has developed a misfire
Posted: Tue Apr 20, 2010 1:39 pm
by bmcecosse
Are you sure you don't now have a coil that is designed for use with a ballast ignition system? In other words it's supposed to work on ~ 9 volts and you are giving it 14! That will overheat the coil - and overload the condenser. Try going back to the original coil - likely nothing wrong with it.
Re: Trev has developed a misfire
Posted: Tue Apr 20, 2010 6:22 pm
by sgray
The new coil is another Bull Motif purchase - I'm just assuming it's the right one. The old coil works but the rivets on the spade connections are loose, so now it's my spare.
Re: Trev has developed a misfire
Posted: Tue Apr 20, 2010 8:21 pm
by bmcecosse
Well - BM don't supply Minis so likely it is the right one. If you have a meter - check the resistance. Should be ~ 3.2 ohms for 12 volt use. Thoroughly clean and degrease the old coil around the rivets - then tighten them with a gentle tap on a piece of rounded end steel rod. i would then use the old coil.........