O2 \ Cat Question
04-07-2009, 08:09 PM
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Location: PHX,AZ
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I filled up today and the pickup is getting 12.7 MPG when it was getting 16 to 18 MPG.
I am sure this is due to many factors 305/4L60E taken out 350(Rebuilt)/4L80E put in it's place, the slight change on the speed o use to read 70 when you were doing 68 but with the swap it is dead on 70 = 70, could the cat starting to plug rob some MPG? or would there be other symptoms from the cat plugging or starting to fail.
It just hit 182,000 miles.
I am sure this is due to many factors 305/4L60E taken out 350(Rebuilt)/4L80E put in it's place, the slight change on the speed o use to read 70 when you were doing 68 but with the swap it is dead on 70 = 70, could the cat starting to plug rob some MPG? or would there be other symptoms from the cat plugging or starting to fail.
It just hit 182,000 miles.
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