I'm no mechanic, but I recently had a similar experience on my '85
Westy. The longer I drove it, the worse it ran -- rough idle, finally
black smoke. Turn it off and it was OK...for a while. Discovered the
oxygen sensor on the exhaust manifold was stuck...telling the computer
to run richer all the time. Good luck.

John

"Bela Zabajnik (by way of Derek Drew )" wrote:
>
> Hello Guys As you can see by the posted readings this
> system goes full rich at about 2000 rpm tested sensors,
> fuel pressure, air flow meter all tested OK Costumer had
> engine overheat a few weeks ago someone else repaired the
> car looks like a good job Any ideas? Thanks