Thorley headers (CA Smog), 2" exhaust, new egr valve
I can run the Zuk for a week and then the light comes on. If I bypass the egr modulator by placing a straw between the p and q hose, p and q on the modulator, the light goes off. I tried smog shops , etc but all I get is the aftermarket headers and exhaust do not have the right pressure for the light to stay off. I cleaned the egr throttle plate and tried to clean the gunk from the hose passage that goes from the modulator to what looks like a sensor but no luck. When cleaning I did notice a little ball inside the passage but I was told that could be to keep the pressure at a certain level because a smaller pipe\passage would colapse.
Any suggestions? Does anyone else notice a small ball\BB in the passage from the modulator to the sensor in front?
Thanks in advance for any suggestions