i get 50 miles per half tank -_- somebody help me!!!

[ono]

ok, so, my car, after i've started it, sputters a little when i start to drive, and it feels under powered. i also get about 100 miles to the tank. could it be an O2 sensor? leaky injectors? both?? any help would be awesome.

Thanks guys,

-Garrett

[Boosted240Guy]

Sounds like a bad 02 sensor to me

[ono]

same here, i'll try replacing it and i'll let you guys know what's up. thanks for quick reply =)

any other suggestions?

[!Zar!]

Is your car stock or what?

Are you sure you are really out of gas?

[ono]

yup, stock, and not beaten cuz it's auto (don't trip, i'm swapping it, lol) i'm pretty sure the gauge is right, it hasn't been wrong before, and it still works to my knowledge

[payne219]

either bad o2 sensor or dicked up fuel pressure regulator... happened to me on one of my daily cars ended up being a bad fpr

[ono]

cool cool, any way to check the fpr? or just replace it?

[duffman1278]

I don't think your O2 sensor would affect your gas consumption by that much. That seems pretty extreme. Have you actually looked at your gas by taking out the fuel pump and looking yourself? I've heard of plenty of peoples floater thing going whack on 240's.

I would check for leaks on the hoses, start at the gas tank and move your way down towards the engine or something.

[Drift_Magik]

check your timing too....

[trsilvias13]

Sounds like my Rx7, do you have a rotary in there?

Also check you fuel filter, spark plugs, dirty maf?

There are many variables that affect mileage. If you do a full tune up it will probably increase your mileage.

[s13_ricky]

I'm getting 80 for a quarter tank. Is that bad?

[ericcastro]

Do the milage guys. its easy to calculate.

As for your float working:
If you open your fuel tank to check it your retarded. It may not prove anything. Next time the car is almost empty, fill it up all the way. should take about 10 to 13 gallons, depending how empty it was. If it takes 2 gallons, then you know the float is messed up.


but sputtering and shit, could even be a bad or cracked vacum line. just replaced one on mine. was giving me horrable milage and i had to depress the accelerator a little at idol.

[Sthrteen]

WoW... 100 per tank or 50 for a half.

I'm getting anywhere from 200-250 miles for about 8 gallons of fuel, little above half tank.

[s13_ricky]

I'm gonna change my spark plugs, spark plug wires, and oxygen sensor this weekend. Hopefully that will do something. I might also put that fuel injector cleaner in too.

[bigOdom1]

I think its time to explain how to calculate mileage.
Step 1. Fill the gas tank Up all the way, hold the nozzle until it clicks itself off, etc
Step 2. reset trip odometer to zero, then start the car and leave, dont drive off and reset the odometer, reset it first.
Step 3. Drive until gauge shows you need more gas
Step 4. Fill Up again, Yeah this takes you filling you car up completely Twice.
Step 5. Make note (look at the pump) of how much gas it took to fill up the Second time
Step 6. Find the calculator on your cell phone
Step 7. Divide the number of miles shown on the odometer by the number of gallons on the pump the during the second fill up (miles/gallons)
Step 7. Revel in the fact that you now know your mileage And Start again at Step 1.

note that odometer may be incorrect due to your wheel/tire combination
also note that regular use of this method can help to notice things before they become more of a problem

[ono]

k well, i'm going to swap the O2 sensor, and go fill up.

castro: thanks, i'll do what you said. you going on the 1st for 626? freaking you and what's his name... with the red coupe and white over fenders, you guys get so flipping close! mad props =)

bigodom: i know how to do math =p lol but thanks for the tips =) i'll probably end up doing that too

i'll jack up the car and look for leaks, and i'll check my vacuum hoses. like brake booster and stuff or what?

thanks guys for all the help =)

[kouki_matt]

it could be a loose spark plug

[steve shadows]

Replace you 02 first, then if it still is happening, lmk I could fit you in for some diagnostic time at the shop on Sunday (mission viejo) just throw me like 80 bucks.

I usually charge 80/hr but Ill help you out for as long as I can

[ericcastro]

Originally Posted by ono

castro: thanks, i'll do what you said. you going on the 1st for 626? freaking you and what's his name... with the red coupe and white over fenders, you guys get so flipping close! mad props =)

Thanks, I hope I can make it. Money wise I might not be able to. I wanted to run more tandem with Kyle too

Originally Posted by steve shadows

Replace you 02 first, then if it still is happening, lmk I could fit you in for some diagnostic time at the shop on Sunday (mission viejo) just throw me like 80 bucks.

I usually charge 80/hr but Ill help you out for as long as I can

If you cant track the problem down, I would take advantage of Steves offer!!

[steve shadows]

Thanks Eric

[ono]

ok well, i pulled the codes in mode 3, the self diagnostics, and it coded 55, which means no malfunction right? what else can i do? oh, and now when i start my car, the rpm's stay at 0 -_- and the speedo doesn't go anywhere. ugh. help??

thanks

[goldollar]

Honestly it sounds like a leaking injector. I have yet to see an o2 sensor cause that type of fuel consumption,but if your not having serious driveability/power loss issues which you would with the above mentioned possibilities i would honestly say you have a bad fuel level sending unit. Break out a multi-meter and do a resistance check on the sending unit circuit and that will tell you if your sending unit is faulty. That or you will see some sort of physical obstruction with the float. Plus i get close to 300 miles to the tank with my SR and thats with an untuned AEM. Check your timimg, check your oil to see if you have excessive gas mixed in there, check the condition of your spark plugs. Id be willing to bet its a combination of several things causing your excessive gas consumption.

[HyperTek]

injector, check for fuel leaks..

could be fuel pump sock etc etc

[goldollar]

What years your car? What engine do you have under the hood? How many miles are on your car? How long have you had this issue? This could help people possibly diagnose your problem.

[mulinmoua]

do u have a bad radiator? my car was doing the same thing and it was because of my radiator being bad. your car could not be running at the right temp and causing the ecu to send more gas to compensate for the wrong temp reading. hope this helps.

[steve shadows]

Originally Posted by ono

ok well, i pulled the codes in mode 3, the self diagnostics, and it coded 55, which means no malfunction right? what else can i do? oh, and now when i start my car, the rpm's stay at 0 -_- and the speedo doesn't go anywhere. ugh. help??

thanks

A leaky injector doesnt cause a unexplainable tachometer anomaly, I would say this is some sort of electrical issue, as in shotty wiring by the ecu plug/ecm etc.

[SoguRacing]

I'm betting that it's your coolant temperature sensor. by the description of your symptoms on start up the car would run extra rich causing sputtering and bad mileage if your coolant temperature sensor is out of calibration. I would pull out your trusty ohm meter and take the resistance "key on engine off" then again when the car warms up. then i would look in the fsm specific to your car and check to see if your readings are within specifications. if not then it's a 20 dollar fix at autozone. the ecu works by sense and response. If the ecu is seeing a a signal from a sensor it will respond according to how the ecu is calibrated for that specific sensor. the cts may be working but sending a faulty signal causing a rich situation. 02 sensor is not important on an obd1 car. also check vacuum lines, and check your maf. my money is on the cts.

[ericcastro]

^yeah, (steve)
Check ALL fuses and the relays that are under the hood.
Now look around for wires that might be shorting.
My car had a big one under the relay/fuses under my airbox. It had corroded, arced and burnt up half the fuse box when i bought the car.
clean things up if they arent already, so you can see in the engine area better.

[nieko]

ya garret clean your shit.

and to your fuse problem.

remember like 2 days ago i wasl ike hey garret my 75 amp alt fuse blew? and i asked if i could borrow yours and id get you a new one?

thats why ur tach is at 0 LOL

but ya, ill give you hand sometime this week.

well change coolant temp sensor. o2 sensor. and ill check your timing. spark plugs. etc.

well get it fixed my son x)

[ono]

lol thanks nieko, forgot about the fuse thing =p to everybody: i'm missing my alternator fuse, that's why my tach is at 0 =p no worries about that. we'll see what nieko and i can find, then i'll post back up with some results, thanks guys =)

-Garrett