My gas mileage is still horrible after new injectors. This morning I filled her up for the first time since then and i got 14.6 MPG and 192 miles on a single tank from completely full to gas light empty.

Anyone have any other ideas on why my gas mileage is so horrible?

Pretty much the only use my Z gets is commuting from my college to home twice a week. 15 miles one way, 90% highway, 10% city. I always let her warm up for 5 min before leaving also.

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

Have you checked the heath of your O2 sensors? Maybe a coolant temp issue? Hole in your gas tank?;) Seriously, I had an issue with a car one time where gas mileage was horrible. It turned out to be a bad gasket around the sending unit that caused fuel to spill out but only when doing left hand turns.

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*-- Just some stuffy advice from a crabby old fart who's too set in his ways. --*

have you run a hot diagnose on the O2 sensors?

you should have at least 5 blinks every 10 seconds per side. If ur not having that then you could be running rich causing your poor mileage.

haha! JT beat me to the O2's

thats crazy...I shift right about 2k everytime and average around 22-25mpg and around 330 miles to the tank.

Brand new O2 sensors on both sides, Brand new Coolant Temp sensor. Last time i was under the car, the gas tank bottom was bone dry.

I don't drive the car like an ass either. I know i have a fair sized vacuum leak, but would that constitute mpg's like what I'm having?

Also she is timed right on 15 degrees.

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

Also all compression of the cylinders was within 10% of each other last time I ran the test with the lowest compression at like 155 if I remember straight.

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

what is your fuel pressure like?

and are you TT or NA? your compression numbers seem a bit low if your NA. I checked the FSM, and according to that your ok, but 155 seems low for a 10.5 compression ratio.

I'm an N/a. And 150ish was just the lowest, all the others were 170ish if i remember correctly

Fuel pressure is 38 at idle I'm pretty sure.

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

solve that vaccum leak, hot test the O2 sensors, take a look at your spark plugs and if all check out look at other possibilites... tire pressure, stock wheels? (heavier wheels will bring down your mileage), slipping clutch etc...

Havent recently checked tire pressure. Will do that this weekend. New sparks, New O2 sensors, but will recheck.

Wheels are 18 inch 350 wheels

Also an Auto

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

then if everything else clears... I'd say your torque converter is dying on you.

Ask around if anybody else is using 350 wheels and saw a drop in their MPG.

I'd say 18's no matter what allow will definitely be heavier than 16's

torque converter would lead to bad gas mileage? Would it also make a popping noise when going into gear?

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

the torque converter would lead to poor gas mileage because it acts as your clutch

the popping noise could be a worn tranny mount.

Remember that the torque converter is always "working" so to speak. The moment you release your breaks the car starts rolling if its in gear. That's why your RPM's need to be set higher at idle, so that when in gear the load put on you engine won't shut it down.

So when your torque converter starts to go out, you'll need to raise the rpm's even more to move at your desired speed

What plugs are you using? oem ngk pfr6g11 i hope.

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I have Lived and Learned to LOVE... MY Z

zazupilot: you are luminar - slayer of Z's
1991zed: "i have a dual hks exhaust that gives me a good 30hp"
Ballistic: "A lime green Lambo with black wheels: The car of choice for the efeminate guy with the tramp stamp who wants to be a bada$$. Just say no to pillowbiting."
Ballistic: "Be sure to tell someone at your job that he's an idiot. Then stay away. Idiots self-destruct at any given moment."
YOU + ARE = YOU'RE. THEY + ARE = THEY'RE YOU ILLITERATE BASTARDS

Luminar Wrote:
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> What plugs are you using? oem ngk pfr6g11 i hope.


Yes sir.

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

I seriously hope I do not have to replace the torque converter. My Z is just so hungry. Hungry for gas, hungry for parts, hungry for my time, hungry for my money. =/

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

Sounds like Christine.:)

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*-- Just some stuffy advice from a crabby old fart who's too set in his ways. --*

JT240Z Wrote:
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> Sounds like Christine.:)
>




lol jt, what does that have to do at all with this?

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2007 Suzuki XL.7 (totaled)
1993 Honda Civic Del Sol (sold)
2008 Suzuki Grand Vitara (current passenger/cargo Vehicle)
1990 Nissan 300zx 2+2 N/a (current DD)
1998 Chrysler Sebring (beater/fixer project/snow car/college commuter...)

If my mind serves me right, Christine was the name of the car that was possesed and trying to kill the girl... kinda like your Z trying to get you aswell =P lol!