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Originally Posted by lotsofish
I just though of another possibility, perhaps.
Bob, you said in another thread here from a few days ago called Service Engine Soon - Insufficient EGR flow that perhaps the EGR stovepipe in the upper intake manifold going bad could cause EGR codes.
I'm not exactly sure what the "stovepipe" is. Is it that thin tube in the UIM? There is a clip in the gasket that holds it in place.
Remember, I just had the intake manifold apart. About a month or so ago I replaced a leaky lower intake manifold gasket (that common problem.)
If that piece moved out of place when I was putting it back together, could this be causing my problems? |
On the P0401 that was related to the EGR flow test where the error pops up after a PCV valve job when the black o-ring is omitted. It causes loss of engine vacuum. Any loss of engine vacuum may affect the EGR valve as far as when the PCM tests it or calls it into service. It affects Manifold Absolute Pressure (MAP).
The stovepipe is that thin tube part on the left hand side of the UIM/LIM. You can see it when the throttle body is removed at the point where the throttle body hooks up to the UIM. The gasket sealing around it is important. I would say that if it did not mate up good the outcome would be some sort of internal vacuum leak so its possible.
However, the EGR code you are getting indicates the EGR is not functioning properly mainly electrically than indicating that there is an actual EGR flow problem.
Whatever your problem is I guess we can all agree that it has something to do with the UIM/LIM job.