Originally Posted by zenoise View Post
2. EGR valve is normally closed at idle and at closed throttle deceleration.
3. When I get a small air leak in the exhaust, I get an oxygen sensor slow response from the front sensor on the side where the leak occurs. Did you get any set or pending codes (like P0133)?
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Originally Posted by Walt View Post
I have a wireless OBD2 reader app and I used to get a pending "slow 02 response" code before the manifold gaskets were done but never a permanent code (CEL). Now that the gaskets are done. I don't even get a pending code. And I monitor the up stream 02 sensors voltage and it's normal.
So I really don't think it's the manifold gaskets.... due to everything stated in my earlier posts...
I'm soon to retorque the flanges but I don't feel it's that because when we blocked the tailpipe there was no hissing or anything coming from there....
I'm thinking EGR. But I'm obviously up for other opinions or guesses.
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