Non Turbo Problem.
Turbo Mini Forums

Yo, just got back from a drive after fitting new plugs and leads to my car to see if it sorted a problem ive been having :

Recently the car has been missfiring at anything over 60mph and occasionly carb pops when i go to put my foot down. Ive checked the plugs and the colour is perfect so im not sure if its the mixture, also after going for it the coming off the gas it sometimes cuts out even when its warm. Aswell as comin off the motorway and up a sliproad, if i coast the revs drop then it just dies! I also noticed today a really nasty yellowy substance which is quite thick on my crankcase breather :s no idea what this is can anyone help? Its a mg 1275 with stage 4 head and 44' carb,

Thanks in advance, Rich

Hi there, it sounds a lot like your ignition timing is incorrect. If you still have points and condenser (im sure some MGs did) check gap. Check rotor arm and dizzy cap for cracks. Check to see if dizzy is loose in which case it could have moved. Make sure coil is working well and that low tension wires are not damaged or corroded on the terminals of coil. It certainly sounds more like electrical than fuel because of the carb popping / back firing.
Let us know how you get on. Did you get it set up an rolling road after fitting St4 head.
Let us know how you get on
Paul

Edited by paul wiginton on 29th Dec, 2005.

I seriously doubt it!

Ive had fun with the amplifier modules on the side of the dizzy causing funny running problems. May be worth trying another of these if you have or can borrow one.

The yellowy stuff is emulsified oil/water. It can be a problem in many cars at this time of year, especially if you do not do many long journeys, as the engine oil does not get hot enough to evaporate any water (from condensation).

As it is so cold at the moment a lot of cars suffer from it, however after a good long run, or certainly in the summer, it should disappear. If it does not, then can point to possible head gasket problems.

Thankyou for the replys! Yeah ive been talking to my dad and he seems to thing that the gunge is due to the condensation as the car has been off the road for a few weeks so may be pushing the crap out.

Paul- it hasnt been set up on the rolling road since the head, but with regards to the dizzy, of recent wet weather i have taken the dizzy cap off and dried it out a couple of times due to missing etc. I tried this to see if that sorted the problem but it still seems to be playing about.

How can electrics cause carb backfires etc if the carb stands alone and doesnt require electrics?? Im sure it is electrics though as the fuelling is spot on!

Thanks again, Rich

You get backfires through the carb usually when the ignition timing is incorrect. If the ign is retarded the plug sparks too early which ignites the fuel/air mixture while the inlet valve is still open sending a backfire through the carb. If the ign is advanced you get backfires through exhaust. Or it could be something like a burnt out or bent or sticking valve. Check your valve clearances.
Paul

I seriously doubt it!

If electrics arn't spot on,i.e. dodgy lead the spark can get delayed,so sparking whilts the inlet valve is still open

also check manifold is done up

Metro turbo weekend driver,Mini turbo in the making again!

hi rich after you have checked the above and you are sure alls inorder

check the breather pipe to the carb for leaks

if the the pipes seal! or are cracked also the pipes to the servo if you have one!

car dieing after a long sustained run will be the carb icing up, happens a lot if K&N type filters are used. Could also explain the other problems aswell.

I've seen the future and tbh its Pie