Quote:
Originally Posted by greasemonkee
Without the egr valve opening properly it will have a tendency to detonate for several seconds after applying WOT. The ecu adds a considerable amount of timing anticipating a slower burn/inert gasses in the chamber.
Interesting - All these years I thought the absence of the egr would activate the MIL.
I posted an egr valve repair thread on here somewhere, for sticky diaphragm-to-sensor pins, perhaps it will save you some trouble.
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I do have a CEL for the EGR. When I had it connected I also got a CEL, it's the same code, insufficient lift/flow. I've tested the EGR per service manual and it indicates it is bad. I've also done the proper cleaning of the EGR passages under the fuel rail and the passages that go into the intake. I'll search for the thread. It would be nice to just repair the valve instead of spending $200.
It came as a complete surprise to me that lean burn would work without EGR. Previously, before I changed my exhaust manifold to the correct setup, I disconnected the EGR because that would actually prevent the car from going into lean burn. If I had the EGR connected it would cut out and stumble when trying to go into lean burn. If I disconnected it the car would not try to go into lean burn and I could drive it normally, and still get 45-48 MPG.
But like I said all I did was change the O2 sensor position back to where it was in the OEM setup, and even with the EGR disconnected the lean burn activates now without an issue.