XF 250 carby bad misfire on cold startup...slight misfire on idle??
the XF has had an ongoing problem where on cold startup in the morning it has a violent misfire at idle...shaking the whole engine almost off its mounts! You can feel it through the entire car...after about 2 minutes of running it settles down...but when warm there is still a misfire at idle..but not as bad...also when cold there isint really any power...and it hesitates to accelerate for the first minute or so of running...when warm the car runs fine except for the miss at idle...im stumped??
its had a reconditioned 250 put in...but the exact same thing happened with the old engine...the carby has been adjusted and some air leaks fixed...the dist cap/rotor/plugs were changed a few months back...although the old engine was burning coolant...so i suspect the plugs may have become damaged...i replaced the ignition leads again today with some new bosch ones and it hasnt really helped...
Where should i start?? The problem is driving me up the wall!
First Ever Car - '84 XF Fairmont Ghia....Big Luxo Tank, Just Gotta Love that Velour!
Previous Ride- '87 XF S Pak...Now Retired with 305,000 on the clock!
Previous Ride-'99 AU Falcon S,Got sick of the 6...Need a V8!
5/1994 ED Futura Classic 5.0 in Polyneisan Green - One of the last ever built