snakepitt1

I have a 1973 911T 2.4L MFI motor. At 4000 rpm under hard acceloration there is a VERY NOTICEABLE bucking. This only happens under HARD acceloration. If I accelorate normally there is no problem. I have replaced the fuel tank, all fuel lines, electric fuel pump, and ejectors. In addition I have replaced the plug wires, plugs dist. cap, rotor, points and coil. I really need help with this one.

Scott Harris
1973 911T Targa 2.4L MFI

snakepitt1

C'mon guys, I really need help here. I have spoken to a few people over the phone and they have suggested that the two lines on the sides of the fuel filter may be backwards. I have also been told that the fuel control rack piston or plunger??? could be sticking. This is a real problem. This car needs to be able to use the power within and not drive like granny on the way to church.

Scott
1973 911T Targa 2.4L MFI

snakepitt1

I NEED HELP WITH THIS. PLEASE DOES ANYONE HAVE ANY IDEAS WHY I COLUD BE EXPERIENCING THIS BUCKING AT 4000RPM UNDER FULL THROTTLE ONLY?
Scott
1973 2.4L 911T MFI

rick g

have you changed your fuel filter?

is your distributor advance working correctly?

have you properly configured your MFI system?

wish i had an answer for you, but sounds like you've done a lot of ground work already.

Bob Spindel

Scott,

Have you tried richening the mid-range (sometimes called 'part-load') adjustment a few clicks? One of the classic signs of too lean a setting is stumbling at mid-range rpms, about 3000 or so. Your symptom is not quite classic, but it's close enough to warrant trying an adjustment.