Weird running Problem
Turbo Mini Forums

Im still sticking with choke seals. Would explein the over fueling and poor running. If its heat related its got to be something expanding e.g. valves going tight in guides or valves clearances tightening up or fueling. A cold engine will run on a very rich mixture where as a hot engine won't.

What colour are the plugs?

EDIT: If its isn't the seals...it could be running VERY lean and occasionally burning on the exhaust stroke due to having wasted spark?

Edited by matty on 22nd Mar, 2009.

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1/4mile in 13.2sec @ 111 terminal on 15psi

When you mean choke seals would you be implying i use a choke?

Plugs are a normal colour, not sooty and not to greyish! I've ordered a mpi coil pack and some new plugs.

See if that cure's it first.

"Cars are a lifetime of pain"

Didn't Nic have a similar problem that turned out to be a sticking valve?

It dosen't sound like a coil problem to me.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

It could easily be a coil problem, I have had troubles like these with coils in the past.

That said, there are numerous other possibilities, that have been mentioned

well I'll try the cheap option first.....then i'll go down the head of pain in the arse route if my problems arn't solved......

Ill let you know how i get on when the coil pack turns up.

"Cars are a lifetime of pain"

did u order a msd coil???

No i've got a friend with one, just going to pinch his see if it works.....then i might invest? I take it its the ford replacement one i need DD?

"Cars are a lifetime of pain"

well any msd that will plug into yours but i think they do areplacment for the ford type

that what plug youve got then??

the one for the rover and ford are different. So mines the rover one, its simple enought to change. Maybe after a few other bits though. if it is that after all still waiting on a coil pack!

"Cars are a lifetime of pain"

i did have a thourght that maybe it could be fueling cos ive had this problem on my brothers vauxhall like backfiring and missing bad cos it was so rich but that was webbers and the main circuit was way out

but then this is one of those problems where youve got to go through the list and eliminate every problem

i know very annoying, But i should have my coil pack and other bits waiting for me when i get back from work.

"Cars are a lifetime of pain"

I've just thought of something else i did when i put it back on the road, about 10 miles ago, I put a bottle of millers cvl in, probably only about 10 liters of fuel in there? would this be a factor?

stef

"Cars are a lifetime of pain"

did you put the whole bottle in?

yes, but realising this i went and put another 10 liters f fuel in!

It wouldn't make that much difference would it?

"Cars are a lifetime of pain"

what is the proper dose?

bottle per 20l, so its not that bad.....

"Cars are a lifetime of pain"

probably wouldnt make a difference.

how old was the petrol?

well a little update, managed about 20 miles constent running on sunday then just as i was heading up the hill to brooklands and hit traffic it started coughing and backfiring from 1500 rpm and just couldn't drive it.

So I got out pulled over, let it cool down a bit (while pushing it up the hill) then it started and ran fine.

This is getting to be more confusing than anything?

ANY BODY GOT ANY MORE IDEAS???

stef

"Cars are a lifetime of pain"

Faulty pickup on crank pulley ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

do you have any way of watching the map/any widebands while this is happening?

if not, get down to your freindly mot station while it is happeneing and see if they will stick it on the gas analyzer while its missfiring.

this will tell you whether its an ignition or fueling missfire! easy peasy!!

then....you can get the resistance values etc etc for the ignition components and check them all over.

no splashing out on bits that you dont need.....instead you can send that money my way.

Ok little update, i played around with this on saturday and have come to the conclusion, i still don't know what it is. It now seems to have a steady misfire on tick over, not sure if its still doing the other symptons when hot, but i'm sure the two are related.

So far i have done this.....

*Replaced Coil Pack

*Replaced Plugs

*check for spark on all 4 plugs with a spark plug checker thing!

*check the crank sensor (was wet inside the connector, so cleaned and dried and put back togeather)

Although i had the plugs out the two nearest the rad where brownish in colour, and the 2 nearest the clutch where black and slightly wet? any ideas?

errr starting to get annoyed now.

"Cars are a lifetime of pain"

Read this thread. http://www.turbominis.co.uk/forums/index.p...tid=217682&fr=0

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Leads breaking down under heat

Own the day

read that thread really interesting, I did a compression test last night and mine were as follow,

1 = 130psi
2 = 130psi
3 = 126psi
4 = 130 psi

Also checked the valve clearences and they seem to be different, although my thought now is with leads, so i'm going to have to bight the bullet and buy some. rubbish!

"Cars are a lifetime of pain"

In a turbo as you know heat is a real issue if your leads are old then start there. Cheapest option first.

Own the day