Old problem of running rich seems to have cropped up again!

The symptoms are slightly different this time.

Instead of a gradually deteriorating fuel mileage over a period of weeks, my fuel mileage went bad overnight!

When I last filled up my tank on Friday evening, the car had done close to 400km and needed 44 litres so gas mileage was about 9km/litre.My fuel mileage has been consistently around this figure since I swapped out my old FD for a used one.

By Saturday afternoon, having only driven for 50km, the fuel indicator was at the 3/4 mark!

I thought there may be a fault in the sender but in any case I decided to monitor the situation closely.

No clouds of black smoke on acceleration, no severe hestation on acceleration, etc at this point in time.

Checked the car for leaks but could not find any.

On Saturday evening, I noticed that when warm, there was a severe hesitation accelerating from standstill (a/c is on as always).Flooding maybe???

With the a/c off, the hesitation was gone.Looked at the exhaust and saw light black smoke at idle.When driving, I don't see any clouds of black smoke behind me like before.

Now as I type this message, the car has done 170km since the fill-up on Friday and the tank is almost at the 1/4 mark!

Looks like I'm gonna have to check out the car again but I wonder what would cause the fuel mileage to go bad really quick?

I will start with the basic stuff (clogged airfilter, coolant temp sensor, etc) and hope I get lucky.

I'll be damned if it's the fuel distributor that's foiled AGAIN!