gas milage only 10mpg i want to cry
Registered User
Joined: Oct 2003
Posts: 137
From: Minneapolis, Mn.
Re: gas milage only 10mpg i want to cry
My wifes 1994 Z-28 m6 is bone stock and gets 29-30mpg if cruised at 60-65mph steady highway in sixth gear. Mileage drops to 18-20 around town if you are driving with a light foot. My car has a cam and headers and I have no clue what mileage it will get ....I can't keep my foot out of it long enough to check mpg capability. 
I am pretty sure it would not do as well as her car. 
I am pretty sure it would not do as well as her car.
Registered User
Joined: Jun 2003
Posts: 3,620
From: Saginaw, Michigan
Re: gas milage only 10mpg i want to cry
Originally Posted by WSUFlyer
O2 sensors alone won't cut your milage in half...the computer uses the 02 sensors as the third sensor it looks at for AF ratio. It first uses the readings from the MAF and MAP sensors. Do you have a SES (check engine light)? If so get it scanned and that will tell you which sensor is bad. When my 02 sensor went bad, I got a SES light. At the time my MAP sensor was goin in and out.
With that many miles, a tune up should be your VERY first step. Get....spark plugs, wires, cap, and rotor, air filter, fuel filter, and PVC vavle. All these items are fairly cheap, and should be replaced anyway. After the tune up, see if you can get a hold of a scanner or have a shop scan your car. With the scanner you can see the readings coming from all these sensors so see if they are defective. The computer is there to help you not part hunt. Don't buy and replace something you don't need to.
Tune it up, then scan it
Ryan
With that many miles, a tune up should be your VERY first step. Get....spark plugs, wires, cap, and rotor, air filter, fuel filter, and PVC vavle. All these items are fairly cheap, and should be replaced anyway. After the tune up, see if you can get a hold of a scanner or have a shop scan your car. With the scanner you can see the readings coming from all these sensors so see if they are defective. The computer is there to help you not part hunt. Don't buy and replace something you don't need to.
Tune it up, then scan it
Ryan
Dan
Registered User
Joined: Apr 2004
Posts: 459
From: East Greenbush, NY
Re: gas milage only 10mpg i want to cry
Originally Posted by WSUFlyer
O2 sensors alone won't cut your milage in half...the computer uses the 02 sensors as the third sensor it looks at for AF ratio. It first uses the readings from the MAF and MAP sensors. Do you have a SES (check engine light)? If so get it scanned and that will tell you which sensor is bad. When my 02 sensor went bad, I got a SES light. At the time my MAP sensor was goin in and out.
With that many miles, a tune up should be your VERY first step. Get....spark plugs, wires, cap, and rotor, air filter, fuel filter, and PVC vavle. All these items are fairly cheap, and should be replaced anyway. After the tune up, see if you can get a hold of a scanner or have a shop scan your car. With the scanner you can see the readings coming from all these sensors so see if they are defective. The computer is there to help you not part hunt. Don't buy and replace something you don't need to.
Tune it up, then scan it
Ryan
With that many miles, a tune up should be your VERY first step. Get....spark plugs, wires, cap, and rotor, air filter, fuel filter, and PVC vavle. All these items are fairly cheap, and should be replaced anyway. After the tune up, see if you can get a hold of a scanner or have a shop scan your car. With the scanner you can see the readings coming from all these sensors so see if they are defective. The computer is there to help you not part hunt. Don't buy and replace something you don't need to.
Tune it up, then scan it
Ryan
Where are you buyin your cap and rotors??? Definitely not cheap anywhere I have seen, if you can even find them.
Thread Starter
Registered User
Joined: Jan 2005
Posts: 224
From: ky
Re: gas milage only 10mpg i want to cry
called autozone just for a basis price. on the o2 sensor's for the 93. MAN i was relieved. $20 a pop.
i'm going to probably take it to a shop monday and also have the spark plugs and wires changed.
my uncle had to replace his distributor cap and i think he said his was $200. <<i thought he was kidding with me but he was not. i asked him if the parts store gave him the K Y jelly.
i'm going to probably take it to a shop monday and also have the spark plugs and wires changed.
my uncle had to replace his distributor cap and i think he said his was $200. <<i thought he was kidding with me but he was not. i asked him if the parts store gave him the K Y jelly.
Registered User
Joined: Jan 2004
Posts: 864
From: Southeast, MN
Re: gas milage only 10mpg i want to cry
Originally Posted by ky1967stang
called autozone just for a basis price. on the o2 sensor's for the 93. MAN i was relieved. $20 a pop.
i'm going to probably take it to a shop monday and also have the spark plugs and wires changed.
my uncle had to replace his distributor cap and i think he said his was $200. <<i thought he was kidding with me but he was not. i asked him if the parts store gave him the K Y jelly.
i'm going to probably take it to a shop monday and also have the spark plugs and wires changed.
my uncle had to replace his distributor cap and i think he said his was $200. <<i thought he was kidding with me but he was not. i asked him if the parts store gave him the K Y jelly.
Most will agree: You do NOT want to use anything but GM O2 sensors.
Do NOT buy the cheap Bosch or any other brand from Autozone.
GM Parts Direct, Dal, or Jason can get you a single GM O2 for less than $40 shipped.
Registered User
Joined: Mar 2005
Posts: 792
From: Long Island, NY
Re: gas milage only 10mpg i want to cry
Check the tire pressure!! (30-35 Psi) is good
Run a bottle of fuel system/injector cleaner
Cat clogged?
Engine temperature below 180 will most likely cause a drop in mileage.
Run a bottle of fuel system/injector cleaner
Cat clogged?
Engine temperature below 180 will most likely cause a drop in mileage.
Registered User
Joined: Jun 2005
Posts: 626
From: MN
Re: gas milage only 10mpg i want to cry
if you bought it from another peson, perhaps they have removed the SES light because it was on and annoying them? or even burned out (for any number of reasons) still might be a good idea to have codes checked
Thread Starter
Registered User
Joined: Jan 2005
Posts: 224
From: ky
Re: gas milage only 10mpg i want to cry
i am running no CAT. convertor.
i did forget to inform you guys that the car is equipped with loudmouth exhaust and flowmaster.
why would a engine temparture below 180 cause gas milage to go up?
i always thought.... the cooler the better
the dual fans are hooked directly up with my ignition. they stay on all the time. so my temp guage never moves. it just stays at 100. which is the lowest it can go on the guage.
i did forget to inform you guys that the car is equipped with loudmouth exhaust and flowmaster.
why would a engine temparture below 180 cause gas milage to go up?
i always thought.... the cooler the better
the dual fans are hooked directly up with my ignition. they stay on all the time. so my temp guage never moves. it just stays at 100. which is the lowest it can go on the guage.
Registered User
Joined: Apr 2005
Posts: 143
Re: gas milage only 10mpg i want to cry
I dont know how these guys are getting such great gas mileage. My '94 Z28 has 125,000 and with that kinda mileage im lucky to get 17mpg. Change the o2 sensors and youll prob be up to 15 mpg which is what most people i know with an fbody get once their car is over 100,000 miles. crying over gas mileage on an fbody is normal.
Registered User
Joined: Apr 2004
Posts: 459
From: East Greenbush, NY
Re: gas milage only 10mpg i want to cry
Originally Posted by Angelis83LT
if you bought it from another peson, perhaps they have removed the SES light because it was on and annoying them? or even burned out (for any number of reasons) still might be a good idea to have codes checked
Easy way to check. Turn the key on. If the SES light comes on, then it's intact and working, if it doesn't, then it's not.
Registered User
Joined: Feb 2000
Posts: 479
From: Rockville Centre, NY, USA
Re: gas milage only 10mpg i want to cry
Originally Posted by s i c trans am
I dont know how these guys are getting such great gas mileage. My '94 Z28 has 125,000 and with that kinda mileage im lucky to get 17mpg. Change the o2 sensors and youll prob be up to 15 mpg which is what most people i know with an fbody get once their car is over 100,000 miles. crying over gas mileage on an fbody is normal.
clean air filter every other oil change
have always changed oil every 3 to 5K using Mobil 1 trisynthetic 5w 30 or German Castrol 0w30.
annually flush and fill coolant, drain and fill tranmission and differential fluids with royal purple or redline with LSD additive and change fuel filter.
run 93 octane from Mobil Amoco or Sunoco.
travel on highway at 65 mph, running 1750 rpms for 28-30 mpg to 80 at 2000 rpms in 6th for 22-24 mpg using cruise.
Only time I ran gas guage to E was on 400 mi + trip to see how the mileage would work out. Was spot on 30 mpg.
It's all in the throttle - easy for good mileage, hard for poor mileage.
Registered User
Joined: Dec 1969
Posts: 27,725
From: Little Rock, AR
Re: gas milage only 10mpg i want to cry
Originally Posted by s i c trans am
I dont know how these guys are getting such great gas mileage. My '94 Z28 has 125,000 and with that kinda mileage im lucky to get 17mpg. Change the o2 sensors and youll prob be up to 15 mpg which is what most people i know with an fbody get once their car is over 100,000 miles. crying over gas mileage on an fbody is normal.