SharpEye

I posted earlier how my ECU is was throwing a code 27, and can't figure it out because I can't find a wiring diagram for my 90. I have been on fc3s.org and the manual on there is for an 89 and the ECU connection is different than on a 90, so I am not able to go by that. I got a reply about mixing in TC-3 with the fuel as a safe guard, but didn't get the ration for it. If anybody knows the ratio can you please post for me please. Thanks...

Ni5mo180SX

Ive eliminated my OMP system and use 1oz of premix to 1g of gas.

I think I used approx. 4oz of premix with a working OMP system on my NA.

SureShot

FWIW- The most common problem is the harness connectors for the OMP at the alternator pivot bolt.
Are the plugs & pins clean & bright?
Have any of the pins pushed back inside the plastic hood?

projekt

with my questionable OMP i add about 8 oz oil.

SharpEye

The connectors look fine and I could atleast do a check with the connector with my ohm meter going to the sensor and that was fine.

The problem only comes up after hard driving, which is kind of a key point to this problem.