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Topic: Terrible gas milage 2.3T (Read 3279 times) previous topic - next topic

Terrible gas milage 2.3T

My 88 turbocoupe daily driver is getting terrible gas milage around 12mpg. The car has 4.10's, t3 turbo, ported intakes, and 65mm t/b pretty much thats it and I dont beat on it always and milage still sucks. It drives real nice and reliable but the milage is killing me also the car is a stick any ideas what to look into to improve milage?
[SIGPIC][/SIGPIC]
87 T-Bird turbo'd and supercharged and if things call for it juiced. :evilgrin:
88 Turbocoupe t3, 4.10's, Daily driver

Terrible gas milage 2.3T

Reply #1 –
hook a dmm up to your o2 sensor and see if its switching slow( the black wire). they have a tendency to read lean as they age.
louie  :birdsmily:
[SIGPIC][/SIGPIC]       
My famous last words:
It seemed like a good idea at the time.        88TC R.I.P.      88 Sport build in progress

Terrible gas milage 2.3T

Reply #2 –
The o2 is not too old i would say 6 months old.
[SIGPIC][/SIGPIC]
87 T-Bird turbo'd and supercharged and if things call for it juiced. :evilgrin:
88 Turbocoupe t3, 4.10's, Daily driver

Terrible gas milage 2.3T

Reply #3 –
Any check engine lights? Check the codes.
93 Festiva L, 193k miles, BP+T/G25MR swap, T3 50trim .48/.42, SRT FMIC, Capri electronics/Rocketchip, 2.5" exhaust
bests: ET 12.86, MPH 110.25, 1.92 short
02 Subaru Impreza WRX, 129k miles
97 Subaru Impreza Outback Sport, 236k miles

Terrible gas milage 2.3T

Reply #4 –
Nope the check engine light is not on.
[SIGPIC][/SIGPIC]
87 T-Bird turbo'd and supercharged and if things call for it juiced. :evilgrin:
88 Turbocoupe t3, 4.10's, Daily driver

Terrible gas milage 2.3T

Reply #5 –
Check the codes anyway, you never know.
93 Festiva L, 193k miles, BP+T/G25MR swap, T3 50trim .48/.42, SRT FMIC, Capri electronics/Rocketchip, 2.5" exhaust
bests: ET 12.86, MPH 110.25, 1.92 short
02 Subaru Impreza WRX, 129k miles
97 Subaru Impreza Outback Sport, 236k miles

Terrible gas milage 2.3T

Reply #6 –
4:10's says it buddy.

My TC is modded to the hilt and blowin 19psi on the street through a SC50 I still get 28-30 on the highway and 16 around town. I just filled up this morning, 18.7 gallons for 342 miles.

Terrible gas milage 2.3T

Reply #7 –
I doubt its the gears.. My 3.8 cougar didn't get that bad of mileage when it had 4.10's.
One 88

Terrible gas milage 2.3T

Reply #8 –
I really doubt its the gears also once in a blue moon it gets like      21mpg also I dont drive that much on the highway.
[SIGPIC][/SIGPIC]
87 T-Bird turbo'd and supercharged and if things call for it juiced. :evilgrin:
88 Turbocoupe t3, 4.10's, Daily driver

Terrible gas milage 2.3T

Reply #9 –
Assuming 5 speed 4.10s x .8(O/D)= 3.28 final ratio... No problem there... Hell we ran 4.30/4.56s on the street in the 60/70s WITHOUT O/D... Yea gas mileage sucked...

If you are just puttering around then that mileage is bad, but with the mods to your car I doubt thats the case... Once you are in the boost, mileage goes in the dumper...

Terrible gas milage 2.3T

Reply #10 –
Quote
Once you are in the boost, mileage goes in the dumper...


Thats the thing even with me only seeing like 2psi on acceleration sometimes milage really stinks.
[SIGPIC][/SIGPIC]
87 T-Bird turbo'd and supercharged and if things call for it juiced. :evilgrin:
88 Turbocoupe t3, 4.10's, Daily driver

Terrible gas milage 2.3T

Reply #11 –
leaking injector o-rings? pretty obvious, but thats the only time my 2.3T has ever got that bad of mileage...
gumby - beauty may fade, but stupid is forever!

Terrible gas milage 2.3T

Reply #13 –
Replace your Temperature sensor (TPS). I had they exact same issue, tailpipes were black and i was getting 15mpg...

heres a picture off NATO (North American Thunderbird Organization) shows sensor locations.
:birdsmily:

2.5" Cat Back Exhaust, CenterForce Stage 2 Dual Friction Clutch, B&M Ripper Shifter, T3/T4 Turbonetics 63 A/R Turbo, Rods Stainless Tubular Ceramic Coated Header, Boost Controller @ 15Psi, Kirban AFPR, 42lb Injectors, 190LPH Walbro Fuel pump, Ranger Roller Cam, 3" Aluminum Intake Tubing, K&N Cone,  KYB Struts, Koni Red Horizontals/Verticals, Eibach Sportline Springs, Racer Walsh C/C Plates, Polyurethane Bushings, 17x9 Cobra R Wheels

Terrible gas milage 2.3T

Reply #14 –
ummm TPS is NOT "temperature sensor"
93 Festiva L, 193k miles, BP+T/G25MR swap, T3 50trim .48/.42, SRT FMIC, Capri electronics/Rocketchip, 2.5" exhaust
bests: ET 12.86, MPH 110.25, 1.92 short
02 Subaru Impreza WRX, 129k miles
97 Subaru Impreza Outback Sport, 236k miles