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Jan 19, 2011 5:28 am
Jan 19, 2011 5:28 am
Subject: V12 torque loss
Any suggetsions on a sudden loss of torque from the V12. It has been going like a train up to10 days ago. Two "incidents" were some auto electrical work on trafficators that, I thought, may have affected the power supply to the fuel pumps (new SUs) and a detailer who might have knocked something on the SU carbs when polishing the engine cam covers.
Engine starts ok and idles well, with no sign of missing on stationary revving to about 1000-1500 rpm. Occaisonal backfire when driving. Absolutely dies on hills (and it had been especially strong up a 3 in 1 grade near my home). Tappet noise a little more than normal when cold. It is almost as if two or three cylinders go out on throttle application under load.
Have to keep revs at about 1500, at least, when changing gear. In the past it would pull strongly from 1000. Now pulls, intermitently, on straight and level, but in lapses.
My mechanic pulled a lot of wooly debris from the air cleaner and this, somewhat, improved the problem.
If anyone can steer me to possible causes, i would be most grateful.
Any suggetsions on a sudden loss of torque from the V12. It has been going like a train up to10 days ago. Two "incidents" were some auto electrical work on trafficators that, I thought, may have affected the power supply to the fuel pumps (new SUs) and a detailer who might have knocked something on the SU carbs when polishing the engine cam covers.
Engine starts ok and idles well, with no sign of missing on stationary revving to about 1000-1500 rpm. Occaisonal backfire when driving. Absolutely dies on hills (and it had been especially strong up a 3 in 1 grade near my home). Tappet noise a little more than normal when cold. It is almost as if two or three cylinders go out on throttle application under load.
Have to keep revs at about 1500, at least, when changing gear. In the past it would pull strongly from 1000. Now pulls, intermitently, on straight and level, but in lapses.
My mechanic pulled a lot of wooly debris from the air cleaner and this, somewhat, improved the problem.
If anyone can steer me to possible causes, i would be most grateful.