I've finally got some time to sort out my 2l pinto.
205 block, unleaded head with electronic ignition.
Started missing on no.4 cylinder during our 6000 mile round trip to Greece, about half way. Got us home where it's been since January.
So here's the thing, I assumed a burned valve but today I did a proper compression test, engine hot, all plugs out, throttle fully open.
Exactly 130 psi on all cylinders.
Valve clearances are spot on.
I've fitted new dizzy cap, rotor arm, leads and plugs.
Removing each lead, one at a time, nos.1 and 2 there's a definite change, no.3 it's there but less pronounced. No.4 no change. However with plugs 1,2 & 3 removed no.4 fires. So there's compression and spark.
Changing back to old leads that I kept as spares doesn't change anything.
No smoke or steam out of the exhaust, no overheat, no water in oil or vice versa.
Checked for inlet leaks with easy start, nothing.
Bunged a different coil on, no change.
New Weber 34ich last year, misses on both petrol & LPG.
Cam lobes look fine, nice even oil coverage on all of them. Spray bar looks fairly new.
Only thing I haven't changed is the dizzy but can a dizzy cause a fail on just one cylinder?
Any ideas before I whip the head off?
Cheers, C.