Hi all one of our cars has a running problem.

When driving along at constant speed around town there feels like there is a slight jerk and go jerk and go jerk and go. The running sounds ok (not noticably missing or backfiring), it is ok on the uptake and the deceleration (was blubbering on deceleration but fixed that).

(car is a non-worked 1ltr with single 1 1/4 su and straight through hotdog exhaust, no extractors)

It is slight but enough to notice and be a bit annoying.

would it be too big a gap in the points ( as they weren't set when replaced )? what else could it be

thanks for the replies in advance
Brenton

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First Two things I would check would be. Spark Plugs and high tention Leads,
Dave

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^^^^^^What he said, get new onesif their old-ish.

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Respect mine and I'll respect yours.

I`ll bet that you have the 29D type distributor ,,, ???

with the vac advance hooked up,,,???

& the base plate is badly worn causing the points to open more, open less,, open more, open less etc etc etc

as the vac advance mech pulls on the points plate it cocks it, (retards & advances the ign timing) as the revs fall, releasing the plate back down effectivly making a smaller points gap, hence revs raise once again (advances the ign timing) ,,, & so on & so forth

Just a wild guess tho cause i have absolutely no idea how things work

But if you`d like to test my theory,,, remove the vac advance,,, Plug the hole in the carb,,, (don`t worry about plugging the hole in the dissy,,, no need to for the time being) set the points gap to where it`s supposed to be (Approx 15thou) --- (making sure they`re in good condition while you`re there obviously) & then set the ign timing to the correct position (maybe about 5 or 7 deg BTDC)

& then go for a run

If i`m right then because the vac advance mech isn`t "acting" upon the worn dist base plate,,, so it shouldn`t surge

Then remove your carby plug from the vac advance port,,, re-attach the vac advance hose & go for another run,,, if it surges like you have described again,,, then you need to either fix the dist base plate or get a new-er (or another) good distributor



easy-peasy

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Sooooo,,,, any news about the running???

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

isnt the 29D dissy a coopers/Gt dissy without the advance (i think thats the number on my Gt one)

No the vaccum advance on dads car isnt connected.

My brother had a fiddle with it, he said something about a wire in the dizzy not touching properly, he also adjusted the points distance as well. they may have cleaned the plugs aswell.

Dad took it to work waiting for him to come home to find out the verdict about how its running

Thanks for the help Matt and others, Its always appreciated

When i find out how it went will give another update

Brenton

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hi fallas im bubba clubbys dad still having problems with this mini Iv cleaned and checked plugs and points fiddled with the points yet at low revs she still jerks around
GOT ANY OTHER IDEAS FALLAS im almost ready to pull out whats left of my hair

thanks

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1964 smooth roof panel van
1967 Mk 1 X-Police cooper s
1970 mini k
1975 leyland

I'd still follow Matt's advice and try a new distributor

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Dizzy was changed to a late clubman type and dad is now running much better.

Thanks heaps for all your help

Brenton

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But what about the car, is it running better?

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Simon

The adventures of an owner builder in the Tallarook Ranges

hmmm haha opps yeah i meant to say
dad says it is running much better

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hahah the old fella now idles smooth