Posted before on this issue but got nowhere. I'm in ca and I fail the egr manual test (they apply vac to egr valve at idle and want the engine to stall). Mine only drops a few rpm. I get both vac and exhaust flow at the egr valve. The valve is absolutely working. I figured I wasn't getting enough ex gas flow to the valve and called trick flow to find out where the heads pick up the ex for the egr. The guy told me it was the small holes in the top of the ex ports. Well after much messing around I've learned that's not true and the tfs tw 185 cnc heads have a passage from the egr port at the intake to a hole at the back of the ex port for no2 cylinder.
The passageway through the intake is completely clear and
The passageway through the intake is completely clear and