my gas mileage. is awful...

[Endri_SHO]

hello guys,

well after i've had my 60K service on my 92 SHO , i've had alot of gas milage improvement, like 75-100 miles in a tank.. unbelievable huh>?... .. well yeah i did , but now with a full tank on highway i am hiting 300-320 miles.. and in city 240-260.. is there anything you guys can help to raise my car gas milage a little higher like it was back then 4 years ago when i got ( use to get 430 miles per tank) what is there some kinda of service i can do t the car ??? ..lmk

thanks to all of you

 

[Dr. Tweak]

430???

I get 350 at BEST in my SHO.

 

[SeanMc]

I'm hitting around 270 on the street (50 mile improvement since changing cam sensor and IAB)...haven't test highway yet, but 350-380 would be about right. I have the 16 gallon tank btw.

 

[SuperHO]

****, I deliver pizzas in my modded 92, and I get at least 340 to the tank, depending on how much I can keep my foot out of it, but if I had to guess, I'd say O2 sensors or EGR valve. Also, change the fuel filter. If it's not throwing a code, the fuel filter could easily **** mileage.

 

[Endri_SHO]

430???

I get 350 at BEST in my SHO.

yeah JOSH, 430 !!! i would not saymore but not redlining it and hiting the secondaries.. though..

 

[Endri_SHO]

thanks guys for the replies, i will try to replace the o2 as they've been in the car for like 70 K miles already + i will change that fuel filter as SuperHO mentioned, and SeanMC i might go with a new IAB too you know cause my CPS is new as i mentioned 60K service got done..

but thanks to all of you guys that replied..
more thoughts are always welcome,....

thanks to all the forum

 

[masho95]

How hot/cool does the car run? You might wanna think about changing the ECT and thermostat too. I had my thermostat stick open and my MPG dropped alot.

 

[SeanMc]

My fuel pump is failing, so my mileage may go up after a change. When I punch it, it feels like I'm hitting the rev limiter...at 5k, maybe 4k, 2k, 3500 and would stay like that until it shifted. It will occasionally hold enough pressure after starting to keep the engine running, and other times it will start, die, start, die, start, die, start, stay on for a second, die. When I'm driving and it starts acting up, it screams like a mother, and gives me a CEL, but no code. A guy at the track had the same problem in his T-bird, he changed his pump, no more issues. Heck, the pump has lasted 151k miles, so it's time for a change anyway. This just justifies me getting a 155lph pump.

 

[91 SHOplus]

****, I deliver pizzas in my modded 92, and I get at least 340 to the tank, depending on how much I can keep my foot out of it, but if I had to guess, I'd say O2 sensors or EGR valve. Also, change the fuel filter. If it's not throwing a code, the fuel filter could easily **** mileage.

I agree with SuperHO.

 

[SuperHO]

I agree with SuperHO.

You mean someone actually agrees with me???!!???