Poor gas mileage. 1/2 a tank in 50 miles - SRT Forums

HUB SRT · 10-20-2009, 01:55 PM

So I had misfire in cylinder 3... didn't use a lot of gas... plug was snow white. lol. so replace all the injectors, new plugs, new intake manifold gasket, and new injector o rings.. ever since i did this car will go through about half a tank in 50 miles... i know i need tune with my mods, but sure seems like something else is at work here... any ideas?

thank you as always.

AngrySrt · 10-20-2009, 03:05 PM

smell any gas? check the lines and when you turn the car off is the line still primed? when you pull off the fuel lines it should spray, i have an 03 and i can just poke the bleeder to see if there is any pressure, turn the car on to prime the fuel pump and see if it has pressure..

HUB SRT · 10-20-2009, 03:21 PM

I primed the line before starting it when I did the job... The bleeder is located between cylinders 2 and 3 on the fuel rail? Should press the bleed when the car is running? And if it turns out I have no pressure... Guess? Fuel pump?

AngrySrt · 10-20-2009, 03:30 PM

ummm did you reset the pcm when u changed the injectors???

HUB SRT · 10-20-2009, 03:34 PM

Its was the same kind of injectors... Figured I didn't need to... I cleared the code for misfire before I did the injectors.

AngrySrt · 10-20-2009, 03:48 PM

well if you reset the code it might just be relearning the fuel trims, fill her up and drive around and if it happens again then more trouble shooting, and i only get 100 miles per half a tank so im not to far off from ya

Adionik · 10-20-2009, 04:02 PM

Quote: Originally Posted by HUB SRT

So I had misfire in cylinder 3... didn't use a lot of gas... plug was snow white. lol. so replace all the injectors, new plugs, new intake manifold gasket, and new injector o rings.. ever since i did this car will go through about half a tank in 50 miles... i know i need tune with my mods, but sure seems like something else is at work here... any ideas?

thank you as always.

You have a serious problem or a leak somewhere. It's not re-learning the fuel trims. Good god :facepalm:

It's going to be kind of hard to find the leak on account of the gas drying up...shit. Maybe jack it up and start it, see if you can find the leak along the lines.

HUB SRT · 10-20-2009, 04:10 PM

I didn't smell any gas... Only disconnected by the fuel rail... And I would know fast is gas was leaking over the engine. Lol. Ill reset the ecu, check for pressure and check for leaks. But if I do all that and strike out, don't know what next...

Adionik · 10-20-2009, 04:34 PM

You might not smell it if it's leaking at the canister or FPR area

HUB SRT · 10-20-2009, 04:37 PM

I would smell gas by there is it was... Well will wait till I get my car back from the shop and keep you all posted... Thanks everyone for your help!

boneriffic · 10-20-2009, 04:54 PM

o2 sensors?

HUB SRT · 10-20-2009, 04:58 PM

Replace the 02 sensor when I put the new exhaust... Has not cat and get the 0420... I know gas will be down due to mods, but still should be seeing about 200 a tank... About...