MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGB Technical - Sooty plugs

After some considerable period of normal running, my 71 B now runs rich, ie the plugs are black and sooty. I have not changed anything, although the car was not run for several months over the winter.

Checking with the trusty Colo(u)rtune showed nothing amiss.

Any suggestions?

Tony
Tony

air filters dirty?
Andrew Blackley

Tony. Install new plugs, take it for a drive on the interstate or motorway, cut the engine near a rest stop, let the engine cool and inspect the plugs then. If they are still sooty, you are running rich. I have found the plugs to get somewhat sooty when I have to use the choke to get started. But, the electrode area is normally clean which is what you are really worried about from a performance standpoint. The plugs also seem to get more sooty in around town driving, hence, you need about 20 minutes of highway driving and new plugs to really use that check. The type of fuel being used will also have an effect on "reading" the plugs. Unleaded seems to have less of a sooty nature than the old, leaded fuel. Les
Les Bengtson

This thread was discussed on 25/05/2002

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.