how to mend mgb gt engin running on after turning off key car keeps running on and shakes after stopping

terry, November 2009

wirecutterman has given you the help you need but based on the age of the car has the engine been modified to run on unleaded petrol?
OR
do you add an addative to the petrol when you fill up?
As stated the engine is too far advanced and valve seats may be to be replaced to accommodate unleaded fuel

Maurice, November 2009

ignition timing is WRONG NEEDS RE ADJUSTING
first check and adjust the points settings
mark the notch on the crank pulley with a tiny dab of white paint or (tipex) also mark the degree of ADVANCE REQUIRED on the timing marks
then use a timing light connected to number 1 plug lead ,vacuum pipe disconnected at the distributor,get someone to start engine now shine the light at the crank pulley timing marks if wrong undo the dizzy clamp and rotate the dizzy till marks are in line of advancement then retighten clamp if after checking that the timing is correct, the cylinder head might need a decoke the fuel mixture also needs checking for excessive mixture.

wirecutterman, November 2009