Sudden Mileage change

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Sudden Mileage change - HELP!

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Sudden Mileage change - HELP! - 6/30/2005 12:29:17 AM

glennt97

Posts: 1
Joined: 6/30/2005
Status: offline

The gas mileage on my '99 GT suddenly went from about 15-18 down to about 11, and the engine is bogging down when I come off the throttle and I'm still in gear. I changed the fuel filter and ran some fuel system cleaner through it and no change. The problem seemed to start about the same time my alternator went out and did a number on my electrical system. I think it may have done something to the control chip... is this possible? Has anyone had a similar problem? She sounds fine, and has plenty of pickup... but the gas is killin' me. Any ideas or help would be greatly appreciated.

~ Glenn

Post #: 1

RE: Sudden Mileage change - HELP! - 7/5/2005 1:49:51 PM

Patrick

Posts: 240
Joined: 3/17/2005
Status: offline

try looking around here: www.mustangforums.com

(in reply to glennt97)

Post #: 2

RE: Sudden Mileage change - HELP! - 2/27/2006 7:41:40 PM

mustang88

Posts: 5
Joined: 2/27/2006
Status: offline

yeah it could have done a number on your ECU. i would go and have the car scanned for any dtc codes and see where that gets ya

(in reply to Patrick)

Post #: 3

RE: Sudden Mileage change - HELP! - 3/4/2006 4:15:10 PM

drw0392

Posts: 158
Joined: 9/24/2005
Status: offline

I had a similar problem, but it was on my Ranger, I was getting about 18mpg, then out of no where I was getting like 15mpg. I eventually found a disconnected wire. A wiring harness had some how come loose from the bottom of my fuse block. I put it back, and the truck is running up to par again. Just out of currosity, has your check engine light come on?

(in reply to mustang88)

Post #: 4