This morning a new featurette on my M3W. It is misfiring violently on full throttle above about 3000 RPM, where it feels a bit like an old fashioned distributor rotor hard rev limiter. I am thinking fuel starvation. I wonder if this might be a symptom of incipient fuel pump failure given I am still on the original LR pump after 8 years but only around 7,000 miles. Anyone else had this symptom? I am about 1/3rd of the way through a tank of 98 octane, bought from the same reliable source in France, where I have bought all my 98 for the last 16 years.
The last time I had something like this around 50 years ago on a racing Healey 3000, it took us months to find the cause but only after we had changed the fuel lines, fuel pumps, carburettors etc. We took the fuel tank out to get it steam cleaned, rumbled and coated. When we collected it from the fuel tank people, they handed us a 6 inch square of very smelly chamois leather and said: "do you think this might have been your problem?" On hard acceleration, it must have drifted back in the tank and covered the fuel pick up. I don't think this can be the cause in the M3W!
Wilson
