Originally Posted by Shadow_S14

So a quick update on my gas issue. I'm getting less miles to the gallon now, down to about 13mpg. There aren't any exhaust leaks that I could tell. I sent out my injectors to get cleaned, didn't change much, so that wasn't the issue. Two codes kept popping up. P0325 and P0400 or Knock Sensor and EGR System. I checked the Knock Sensor; it was cracked to shit so I changed it with a new one and checked wiring on harness/sub-harness and all is good with continuity and resistance. But the code still persists... any suggestions on this one? For the EGR I took out the EGR itself cleaned it out, got rid of all the build up inside and replaced hoses. I assembled it all back and noticed that when I push up the diaphragm in the valve it doesn't stall out or change idle speed at all. Although when I rev the car it does lift up as it should... I'm a little stumbled here, any insight would be great.