Trev has developed a misfire

[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

[aupickup]

timing or valve gaps

[alex_holden]

Was it misfiring before you replaced the coil?

[sgray]

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.

[mike.perry]

Coil again, condensor, dodgy fuel?
Loose electrical connection, rotor arm.
Try to get it fixed before next Sunday's drive

[chickenjohn]

Condensor, if not that then do a compression test- could be a slightly chipped exhaust valve giving a slight miss.

[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

[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.

[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.

[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.........