Gas millage

Tiny
BRANDON GP
  • MEMBER
  • HONDA CIVIC
I have a 1994 honda civic lx 4 door 1.5 automatic with 77,000 miles. :D I am only getting 25 MPG. That is city and highway driving together at about 70 MPH on highway. I am know it gets 35 or better. What is my problem
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Thursday, November 29th, 2007 AT 8:39 PM

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Tiny
MHPAUTOS
  • EXPERT
Hi there,

The first thing to do is make sure that the engine is tuned correctly and in good condition. It only take a faulty vacuum hose or the ignition timing to be slightly out and your fuel consumption will go out the window. Start there first.

Mark (mhpautos)
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Saturday, December 1st, 2007 AT 7:22 AM
Tiny
BRANDON GP
  • MEMBER
I have looked at everything and it looks good. No vacume hoses are off. I want to know if a bad O2 censor will make my gas millage to go lower.
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Tuesday, December 4th, 2007 AT 7:11 PM
Tiny
MHPAUTOS
  • EXPERT
Hi there,

Yes it will, these will fail and the only thing you may notice is a gradual decrease in economy.

Mark (mhpautos)
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Tuesday, December 4th, 2007 AT 8:15 PM
Tiny
BRANDON GP
  • MEMBER
I put a new O2 sensor in and I have not got any better gas millage. Do you know of anything else that will make my gas millage go down.
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Sunday, December 9th, 2007 AT 6:51 PM
Tiny
MHPAUTOS
  • EXPERT
Hi there,

If you are sure all the relevant tune up items are correct, I would be doing an exhaust gas analysis.

If you see a higher than normal reading on the hydro carbons you may have a problem with an injector, you can have a injector service done on car"it is a good idea to think about this every few years as they are often forgotten about completely. Also a skilled operator will be able to read a live data read via a hand held good quality scanner, this may show up something. If there are NO codes set (you have checked?) You don't always have a fault light on with a set fault code. Also check things like valve clearance's coil out put voltages, High tension lead resistances, and get a run on a oscilloscope, as that will be able to do cylinder balance checks, check KVa's and ignition pattens, all helpful in diagnosing tune faults,

Mark.
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Sunday, December 9th, 2007 AT 8:41 PM

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