poor gas mileage I need help!

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set7565

New Member

Mar 9, 2004

9

0

0

Mar 9, 2004

#1

• Mar 9, 2004

• #1

My '90 lx 2.3 liter with a 5 spd I have had for about six months now, I've tuned it up with a new: cap, rotor, plugs, wires, K&N, and new muffler and tailpipe. It only has 70,000 original miles, runs fine, power wise, but it'll only get about 12mpg city, and about 18 highway. A 5.0 doesn't even get that bad! I do take it a little high(3500-4000 rpm's) but shouldn't I be getting better? Please help me I'm stumped.

 

Cougar

Founding Member

Sep 29, 2001

913

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0

Manhattan Kansas, KSU

Mar 9, 2004

#2

• Mar 9, 2004

• #2

Get the codes pulled out of it at autozone or somewhere.

 

Dan P.

Founding Member

Apr 26, 2002

483

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27

N.C.

Mar 9, 2004

#3

• Mar 9, 2004

• #3

Have you replaced the O2 sensor? And also try the fuel filter.

 

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set7565

New Member

Mar 9, 2004

9

0

0

Mar 12, 2004

#4

• Mar 12, 2004

• #4

Still crapy mileage in my '90 lx

I replaced my fuel filter, and I have a new o2 sensor. I ran a scanner on it and it stated that the o2 sensor voltage was low, how do I fix that, is the oxygen sensor faulty?

 

Gotta91LX

Founding Member

Jul 11, 2002

453

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16

Reserve, LA

Mar 12, 2004

#5

• Mar 12, 2004

• #5

I would check your PCV valve.

Wayne

 

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Dan'l

Founding Member

Aug 2, 2001

1,539

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0

wisconsin

Mar 12, 2004

#6

• Mar 12, 2004

• #6

12/18 leads me to believe the computer is on limp home mode. Spend the $20 or so and get a code reader. Let us know what it says(flashes). To put this in perspective, I regularly get 26+mpg on my 91 which sees the rev limiter at least 5 times a week. Years back I had a 1968 firebird which we transplanted a 66 425 olds into which regularly saw 21 mpg - (or 4 mpg if you had an awesome night) but it usually ran 18 to 21 mpg. Is your timing belt still in sync?

 

1992 2.3LX

New Member

Dec 5, 2002

885

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0

Ky

Mar 12, 2004

#7

• Mar 12, 2004

• #7

i get 26 mpg and i have 155,000. what type of o2 ensor did you get??

 

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set7565

New Member

Mar 9, 2004

9

0

0

Mar 12, 2004

#8

• Mar 12, 2004

• #8

o2 sensor

1992 2.3LX said:

i get 26 mpg and i have 155,000. what type of o2 ensor did you get??

Click to expand...

I have a bosch o2 seneor, and it's only about three months old.

 

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ka0tyk

Founding Member

Oct 10, 2001

1,610

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0

Los Angeles, CA

Mar 12, 2004

#9

• Mar 12, 2004

• #9

just because parts are NEW doesnt mean they are GOOD... run codes and see what your computer is thinking.