Ok heres my dilemma.
b16a into 91 ef chassis.
Started fouling plug number #2. Car sounds like an sti only running on 3 cylinders.
I cant find the problem why.

plug 134 look all fine and nice brown.
Plug 2 is just really black.
Its not wet black, it looks like just hella carbon build up on it.

What ive done, changed plugs.
Cleaned all contanct points in cap n rotor.
Change plug wires.
Cleaned injectors.
I switched injectors around to see if it was a leaky injector but it still fouling plug 2.
I did compression check annd cylinders at 182psi.
Also at night it runs awsome.
But when its hot outside (vegas) thats when the plug fouls.

I can clean the plug and drive it all night fine.
But when i go out in the day in the sun, plug fould about 1 miles down the road.

Plz any info would be great.

 

U didn't mention which OBD verision and ECU you were running.

I'd measure the IAT sensor and make sure it's within spec. Might want to check the resistor box and see what the resistors are reading at.

Janos

 

obd-0 pr3.
What should the specs be?

 

it was the fuel pressurer regulator making car run rich fixed now.