Fuel flood problem

[Racecar_Dave]

My Gn keeps fouling plugs and it doesn't seem to be isolated to just one cylinder. How do I test my fuel pressure regulator. I suspect it's the problem and not all 6 injectors. It's reads 40psi at idle and idlng seems to be when the plugs foul.

 

[1986 Buick GX1]

Maybe the O2 sensor is wonky, giving the computer a bad reading, making it run rich?

 

[Racecar_Dave]

now that im thinking about it. i think 40psi was what ive been seeing back when the car ran fine. i just replaced a coil pack but didnt replacer that think underneith the coil pack. i wonder if my spark is too weak to ignite all the gas

 

[Racecar_Dave]

o2 sensor aint a bad idea. i think this one has one 02 sensor too which would confuse the computer

 

[1986 Buick GX1]

It seems Denso is the preferred brand.
If you have a scanmaster, post the numbers when the car is warmed up.
I believe a pre turbo exhaust leak would cause a lean condition.
I’m not sure what would cause a rich condition other than injector not closing all the way, fuel pressure regulator not working properly (leaking diaphragm) or plugged/ restricted fuel return line.
I’m sure others will have more knowledge.