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Discussion Starter #1
My 5.0 is getting a nasty 10 mpg...

I am pretty sure it is running rich cause I can smell it and if I rev it up past 3 grand and then let off I get some popping out the exhaust (sounds like small backfires).

The timing is somewhere between 10* - 14* btdc...

What can I do to get the car to run less rich and save some gas? (other than driving it like a grandma)
 

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Popping like crazy when you let off sounds like a break/crack/gap in the exhaust somewhere. Its oletting it suck in cool air mixing with the hot gasses from the motor.

Mine is doing the same thing. I had a crack in the stock header that was noticable on close inspection so I changed it out with another stocker. Im still getting the same thing now but not near as bad. Im thinking the flange on my h-pipe isnt getting pulled up tight enough to make a new seal now.

Mileage didimprove just a little bit, but still smells rich.
 

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Ill check the flange, and make sure they are tight against the motor...

I know that exhaust leaks can cause backfiring, the return for the smog pump was cut off and before I welded it shut the thing backfired like crazy!
 
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