1994 Camaro Z28 A4 Terrible Gas Mileage
#21
u will need a vacuum tester with the pump. im waitin for the camera battery to charge so i can t post a pic. i applied a vacuum to the tb side of the purge solenoid valve. thats the electric valve that the (smaller) medium sized hose from the tb goes to, its mounted on the passenger side of the intake on mine. the other hose from the valve goes to the vent pipe from the fuel tank. the pressure control valve is in the back of the driver side wheelwell behind the plastic cover in the cubby that goes to the tank. there are three connections on it, two in line and one on top, it should not flow air unless there is a vacuum applied to the little hose on top. mine flowed air no matter what on both these valves, the control and the purge valves so it was a easy diagnosis.
and one more thing. Getting 15mpg around town with an A4 is not out of the question. How long you warm up the car, sit at lights, are in stop and go all contribute to "poor mileage"
The high numbers you hear for mpg tend to be from the M6 cars.
95 Z28 A4 with CAI, lt headers, magnaflow, custom tune, 3.23's and about 15-17 mpg around town. FWIW, the newer S197 mustangs with the 4.6 aren't much better around town.
The high numbers you hear for mpg tend to be from the M6 cars.
95 Z28 A4 with CAI, lt headers, magnaflow, custom tune, 3.23's and about 15-17 mpg around town. FWIW, the newer S197 mustangs with the 4.6 aren't much better around town.
I know 15mpg is normal for around town but I never actually gotten 15mpg. I usually get 13.5 - 14.5 mpg depending on how much I want to risk getting stranded in the middle of no where. Only time I got more was around 18 maybe, and that was a 430 mile interstate drive with cruise control on the whole time and a lot of down hills.
Did the custom tune help at all?
#22
Did you put the 3.23 on it or is that what's on our cars stock? Cause if I remember correctly the stock number was lower, which means you're getting a lot more than I would if I had the same gears.
I know 15mpg is normal for around town but I never actually gotten 15mpg. I usually get 13.5 - 14.5 mpg depending on how much I want to risk getting stranded in the middle of no where. Only time I got more was around 18 maybe, and that was a 430 mile interstate drive with cruise control on the whole time and a lot of down hills.
Did the custom tune help at all?
#23
I've been having the same problem I've been checking what everyones been saying to check and still not fixed.
just thought id add that theres another '94z a4 out there with all the same problems . as dumb and simple as it sounds, maybe check for a small leak in your tank or fuel lines?
just thought id add that theres another '94z a4 out there with all the same problems . as dumb and simple as it sounds, maybe check for a small leak in your tank or fuel lines?
#24
I don't know what the problem is that you are having. I also have a '94 Z28 with the 4L60E, I get over 20 on the highway. Not a lot of around town driving where I live, so I am not sure what I would be getting in that scenario.
#29
You may want this link that " Libertyforall " posted in "FACs" in the 4th Gen area, for a car parts manual too.
http://www.z28.com/LyleA/93-02%20%20...s%20Manual.pdf
http://www.z28.com/LyleA/93-02%20%20...s%20Manual.pdf
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