MPG Loss! Please help
Thread Starter
Heel & Toe
Joined: Feb 2002
Posts: 15
Likes: 0
From: Tacoma wa
MPG Loss! Please help
Changed the optispark,plugs,coil,airfilter,wires,and oil 2 weeks ago. The car needed a serious tuneup, I was averaging 18 mpg over a 1 year period of time, since then I am getting about 15.5mpg its not a huge deal but I wanted to know what the possible causes would be.
Thanks :cheers:
Thanks :cheers:
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 31
From: Central Florida
Re: MPG Loss! Please help (vettehead1995)
In my area, MPG goes down in the winter time due to the additives the government mandates be added to gasoline to reduce pollution in (relative) colder weather. You might check your log to compare your MPG at THIS TIME LAST YEAR. I lose 2-3 mpg this time of year. Just a thought.
Ranger
Ranger
Team Owner
Joined: Jul 2001
Posts: 21,391
Likes: 1,011
From: Various places in Southern California.
Re: MPG Loss! Please help (vettehead1995)
This may be a stupid question, but did the mileage drop occur shortly after the plugs, coils, wires and filter change? If so, there's a high probability one of those is the culprit.
Melting Slicks
Joined: Aug 2000
Posts: 2,248
Likes: 1
From: Newland US
Re: MPG Loss! Please help (vettehead1995)
vettehead1995,
I'd make sure that all the ignition wires and coil connections are good. There is a chance that you cracked the porcelian on one of the spark plugs when you installed; easy to do. I'd expect something like this if the drop in mileage was immediately after the tune up.
If the mileage decreased over a period of time then you may want to consider the oxygen sensors and the ECT sensor.
Good luck.
Mark
I'd make sure that all the ignition wires and coil connections are good. There is a chance that you cracked the porcelian on one of the spark plugs when you installed; easy to do. I'd expect something like this if the drop in mileage was immediately after the tune up.
If the mileage decreased over a period of time then you may want to consider the oxygen sensors and the ECT sensor.
Good luck.
Mark
