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Old 01-07-2013, 12:21 PM   #11
curtisparker82
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im gonna try and clean the IAC and see if that helps if not i guess i'll get a factory coil on payday
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Old 01-07-2013, 01:55 PM   #12
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Best thing along with a general "tune up" I did for gas mileage is get an UltraGauge, google it give you instant feedback on miles per gallon, avg mpg and so much more!
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Old 01-08-2013, 02:51 PM   #13
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I did plugs, wires, coil, air filter less than 5k miles ago...running castrol 5w30 full syn...i wanna delete the egr but dont want the check engine light
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Old 01-08-2013, 03:24 PM   #14
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EGR should not impact your MPG in any way. Its an emission controlled device. Its to make your tail pipe emissions cleaner not reduce your MPG. When was the last time you checked tire pressure? Fuel filter? Possible partially clogged CAT? I know sometimes after sea foam in the intake or other aggressive quick intake cleaners could clog up the cat....
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Old 01-08-2013, 04:36 PM   #15
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Quote:
Originally Posted by Magus2727 View Post
EGR should not impact your MPG in any way. Its an emission controlled device. Its to make your tail pipe emissions cleaner not reduce your MPG. When was the last time you checked tire pressure? Fuel filter? Possible partially clogged CAT? I know sometimes after sea foam in the intake or other aggressive quick intake cleaners could clog up the cat....
HAD THE CAT OFF IN THE SUMMER IT WAS CLEAN...CHANGED THE FUEL FILTER IN SUMMER CHECKED TIRE PRESSURE SUNDAY IT WAS 30-32 PSI....
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Old 01-08-2013, 04:46 PM   #16
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have you checked the PCV hose or the PCV it self?
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Old 01-08-2013, 10:41 PM   #17
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On my old '02 ZTS I was having a similar issue, where my MPG was steadily declining until it got as low as 21-23 MPG. My issue turned out to be my DPFE sensor (EGR pressure feedback).

I found an easy way to test it as well, simply go to your firewall and unplug the wiring pigtail from the DPFE sensor. If, after you unplug it, your MPG improves then you know it was the problem. >Here< is a photo showing the DPFE sensor near the brake fluid reservoir. After I unplugged mine, my MPG immediately went up to 25-27.

Another recommendation, if you do find your DPFE sensor is bad, don't cheap out on the replacement. I bought a generic chinese cheap-o replacement on eBay and it was worse for my MPG than the OEM one that went bad. Go with a genuine Motorcraft part, it will be more expensive but its worth the difference. After replacing mine with a quality part my MPG returned to the normal 27-29 MPG.
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Old 01-09-2013, 03:19 AM   #18
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Errant EGR CAN cost mileage if causing misfire by being on at wrong time or too much, the misfire wastes fuel.............
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Old 01-09-2013, 05:08 AM   #19
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You can always try replacing the O2 sensor. Rockauto has the NTK for a very good price. It's the OEM manufacturer and looks just like the motorcraft at a fraction of the cost.
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Old 01-09-2013, 08:19 AM   #20
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Quote:
Originally Posted by magus2727 View Post
have you checked the pcv hose or the pcv it self?
changed pcv in the summer...haven't checked the hose real good but just looking at it it looks ok
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