Morris Minor Owners Club

Any Ideas,

Moggy starts runs fine after about 5miles , its seems to run on 3 cyinders loses power the stalls, when its starts doing this then its consistent every 100m or so.

Every ignition part is new, plugs points distributor.

Last job done on the car carb overhaul kit and inline filter, the carb was tuned using the lift pin method.

Help

Coil ?

are these symptoms of fuel starvation, do you think it could be the float chamber needle valve sticking as the carb was the last job done?

Not really - fuel starvation usually results in the car stopping dead straight away....

Coil/Condenser breaking down are a possibility - try testing for a spark when it's in it's "dead" condition.

One thought though - is the petrol tank "breathing" properly? I think these breathe through the cap, and if this is clogged then it will form a vacuum in the tank after a short while and starve the engine of fuel. Try taking the cap off, and if it immediately starts, that's your problem! Then fix the cap properly of course.

Hope this helps!

Look to your inline filter - is it blocked ? Also - since it happens after a few miles - take the petrol tank filler cap off and listen for an inrush of air. That could be the problem!

strange thing about the inline filter, should it completely full with fuel with no air gaps, it seems like it only 3parts full when the engine is running.

^^^ No thats normal....

Had very similar symptoms with my TR4- turned out to be rust flakes in the fuel tank that blocked the pipe...when the engine quit, and the suction stopped, the flakes would drift away, only to return after a few more seconds of driving.

Not really - fuel starvation usually results in the car stopping dead straight away....

had these symptoms with a blocked inline filter... For the first day (through Spain) it only showed on hills!

I dont know want to try 1st, how do i test the coil, should I remove the filter?

Test the coil by taking the HT lead out of the distributor, turn the ignition on hold the copper end on the HT lead with a pair of insulated pliers against a head stud and turn the engine over with the under bonnet starter button. The HT lead should spark.

The coil could be breaking down whe hot so as you have the engine running OK until it gets warm you need to check for a spark when the car stalls out on you. Be aware though that only a small drop in temp could bring the coil back to life and therefore make you think its OK. For the sake of about £10 why not just put a new one on and try it. If it still plays up, at least you know its not the coil. Would be my first check though all the same....

have you adjusted the tappets lately

Tappets ?????????? Unlikely!
Coils don't often 'break down' - but it is a possibility. Try removing the extra filter, no need for it anyway - Minors already have a filter in the base of the fuel pump - try cleaning it !

i had this problem with the fuel filter in the pump,takes 2 minutes to check

For what its costs, Im going to replace coil and fuel pipe to carb lose the filter.

how easy is it to clean fuel pump filter. I dont want open anther can of worms there!

how easy is it to clean fuel pump filter. I dont want open anther can of worms there!

It sits under one of the pipe connectors in the pump (IIRC it's the inlet - so as long a sthe pipe nut comes off without damaging the pipe it shouldn't be too hard)

As for the inline filter - these are really worth having as the pump filter is not fine enough. An inline filter is fairly cheap and quick to fit and keeps the fine dirt out of the carb...