My 1991 XJS is running extremely Rich. Car has been tuned, plugs, wires, dist.cap, rotor. Replaced Fuel pressure regulators. No change. Excessive fuel consumption 125 mls. per. full fuel tank. Any an All advice, suggestions will be appreciated. Thanks Kp.

 

WHOA! 125miles /tank 6 mpg?

when you drive where do you drive how far and how long....

what is the outside air temp?

I am bad to mine: it is about 4 miles to work and I just get out of the warm up fast idle after about 3 miles of stop and go...

is the idle fast?
do you have a air fuel ratio gauge?
when was the last time the o2 sensor were changed?
they are on clearance at rockauto...

I am about to install a

 

Yeah what condition are the 02 sensors in? Are the cats coming up to temp?

Does the car run and rev properly? Can you hear the injectors ticking or are they just stuck open?

Please label your post next time.