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ECM or electrical

Tiny
JAKEWOODY3
  • MEMBER
  • 2012 FORD FUSION
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 62,000 MILES
I was installing an external speaker and running the wires through the firewall but I forgot to disconnect the positive wire from the battery and when running them the wire grounded to the frame touched the positive wire and sparked. Now my car is saying it is running like twelve mpg AVG when it used to always stay at around twenty two mpg AVG. I am guessing I messed up the computer?
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Monday, June 19th, 2017 AT 8:24 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

It sounds like the computer just needs to relearn. Just keep driving it and it should resolve.

Please let us know what happens, we are interested to see what it is.

Cheers, Ken
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Wednesday, June 21st, 2017 AT 5:18 PM

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