I have a question about cleaning out the EGR passage on my 2003 Monte Carlo, 2.4L, V6. Should compressed air blown into the EGR side of the passage result in compressed air coming out the hole in the bottom of the intake manifold?
As info, I removed the throttle body and cleaned the hole in the intake manifold that is behind the throttle plate (when assembled). It had a lot of carbon on it. I also cleaned out, as best I could, the horizontal hole in the manifold leading from the EGR valve
towards the throttle body. But, I cannot get compressed air to blow either from the EGR side to the hole behind the throttle plate, or vice versa. This makes me wonder if there is an obstruction in the way which I can't see. I tried pushing a wire through, but can't get an open passage. The wire only goes so far and stops.
Another thing I did was crank the car without the EGR installed and test the exhaust gas from the tube that connects to the EGR valve, and the vacuum at the EGR manifold port. The exhaust gas flow was strong; but, there was no vacuum.
I'm thinking that the passage may turn up, down, or sideways after about three inches because that's as far as I can go with a wire from the EGR side of the passage. Thanks for any help you can provide.