MPG's keep dropping! Can't figure out why. Please help.

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04-23-2012, 02:00 PM

#21

outlaw08

Thread Starter

Join Date: Apr 2012

Location: pennsylvania

Posts: 36

I replaced the fuel filter with another motorcraft one off of American Muscle's website. And all of the fuel I have been using is Bp and Shell, which are the same stations I have always filled at. I might change my filter again to see what happens.

04-24-2012, 09:24 PM

#22

outlaw08

Thread Starter

Join Date: Apr 2012

Location: pennsylvania

Posts: 36

How do I tell if i have a clogged cat? Prefferably without taking it off. Never had to deal with a cat problem before so i don't know.
Thanks guys

04-24-2012, 10:15 PM

#23

owero01

5th Gear Member

Join Date: Aug 2006

Location: MD

Posts: 2,083

If you have a clogged Cat, there will be a definite loss in performance and mpg. The only way to tell is to take them off I think. A decent muffler shop may be able to help you with that.

04-25-2012, 02:03 PM

#24

SCCAGT

3rd Gear Member

Join Date: Nov 2006

Location: Kansas City

Posts: 960

Quote:

Originally Posted by owero01

If you have a clogged Cat, there will be a definite loss in performance and mpg. The only way to tell is to take them off I think. A decent muffler shop may be able to help you with that.

The way converters are checked for clogging is by drilling a hole before the converter. A pressure gauge is used in the hole. Over 2psi is excessive and indicates a clogged cat.

And yes, you would be experiencing a power loss. Acceleration would be way down. An old dead Yugo could beat you from stoplight to stoplight.