For the '95 in the sig:

I have been chasing a slightly shaky idle, poor gas mileage, and rich smelling exhaust for a while now.

I started out by changing wires, cap, rotor, and plugs. When I took them out, #1 and #2 were darker than the rest and seemed a bit oily. They were Autolites.

The new plugs I have in there (about 500 miles on them), #1 and #2 are darker than the rest again (they are Bosch Plats given to me by a friend).

I just changed them out to Motorcraft Plats and put in a new O2 sensor.

Any thoughts? Could the EGR be dumping too much exhaust gas in there fouling #1 and #2? I removed the IAC and it looked fine inside- cleaned it anyway. Have not removed the EGR yet.

Thanks,

 

Have you tested the injectors on those cylinders? If they are leaking it could cause the symptoms you describe.

Regards
Jean Marc Chartier

 

JMC-

I have not checked them as of yet. 'Tis what I suspect, but I was not sure of a nice and clean way to check them out.

Fuel pressure KOEO: 38psi

Fuel pressure KOER: 30-31psi fluctuating

Fuel pressure vacuum disconnected: Increased 10psi

Cylinder compression (dry): all 180-190psi