why am i getting 150miles out of a tank?

[Zboner]

98ls1, auto, tranny just rebuilt, the engine is making some noise now like a knock. and i do not let the rpm's over 2,000. and im using 93 fuel, so why the hell am i getting 150miles out of a tank :mad: :mad:

[Sarge]

Zboner you lil shit..... what are your air/fuel ratios throughout you RPM bands....
Who is your tuner and do they have experiance with an LS1? Give us a bone man.....

[Zboner]

the thing is stock amlost has no tunning yet, only had it for 4 months now, but these are the guys that will do my work check it out http://www.ts-performance.com

[Sarge]

Well shitfire....take it to these folks and let them get it up on the dyno and see what the hell is going on.....Or do you want us all to guess...Zboner...you lil shit...what are we gonna do with you? Have them look at it and tell us what they "find".....or write me a check for about $65K and you can terroize all of your city:)
Or change the spark plugs.... :naughtywa

[Zboner]

:haha: you crack me up man, :lmao: i got to meet you one of these days. :lmao:

yea the car is under warrenty still, hope i can talk them into talking the warrenty people into a new engine :yup:

or just give you 30k and see if you can squeese some hp out of it :naughtywa

[MadSeason]

by chance is the service engine soon light on? does it lightup when you start the car so you know its working?

[Zboner]

by chance is the service engine soon light on? does it lightup when you start the car so you know its working?


yes it lights up when i start the car. but has nevr came on. and does not stay on, what you think it is

[MadSeason]

Well if it's all city driving with the AC on you're not going to get that great of mileage (12-15 MPG sometimes ). A few things I'd look into are: a fuel injector cleaner, new fuel filter, new plugs and wires, check the air filter, run an engine cleaner (amsoil engine flush AEFCN), and change the oil. Other than that check the exhaust to make sure you didnt bottom out and kink something. Can't think of anything else right now but good luck

[Zboner]

changed oil last week, never run air, all highway driving

[BlackTAWS6]

Dont let the car run over night!?! Helped me out with mileage

[Zboner]

ok, they said to change my plugs and wires that it may be the problem,if not to come back up,

but i removed the screen from the mass airflow sensor. could that be it?

[BIG D's SS]

When I changed my mass air halves it didn't hurt my mileage. The only problem I had was the oil from the k&n getting on the maf sensor throwing a code. Fixed that not so much oil next time. :think:

[Zboner]

it didnt throw a code or anything at all i just think it is need of a serious tune up thats all.

[BIG D's SS]

:yup:

[Zboner]

i need taylor wires, what are some good plugs? i know they need to be 45's and gapped to 43 right?

[Deviant Hawk]

1-When you descreened your MAF, if you hit the the little sensors in the center at all you could have very well screwed them all up and A/F ratio is all jacked up. You'll need a new MAF.

2- Also it could be your TSP or TPS (can never remember the order) sensor. I have 2 buddies who both had '98s and they would only get like 130 miles to a tank.

3-Best plugs would be Iridium NGK TR55's. Already pre-gapped, no worries.

[SeVeReDiStOrTiOn]

yea the tr55IX plugs are awesome....have fun changeing the plugs though, trust me you'l never forget it :ahh:

[Zboner]

yea the tr55IX plugs are awesome....have fun changeing the plugs though, trust me you'l never forget it :ahh:

i spent an hours changing the easiest plug last night, i thouhgt it was not worth it, so i m haveing a shop do it for $70 to me thats worth it.

[FSANE]

I get about 160 mile on a tank, so dont feel bad lol

[Zboner]

how? my engine is stock?

[FSANE]

Mine did that stock too. We both have heavy feet.

[Zboner]

Mine did that stock too. We both have heavy feet.

no but last tanki kept it under 2,000rmp's with no ac and tops on

[TwistedSS]

I drive my 99 Z28 over 70 miles per day for school, I clock 22-24 MPG if i stay at 80 MPH on the interstate (2100 rpm) and keep my foot out of it. I guess having an A4 and 2.73's helps out a little...but I run with the AC on too. Around the city or if im screwing around, bye bye gas milage. When I first bought the car I got like 150 miles out of each tank....quickly learned my lesson. Also had to rotate tires :burnout:

[FSANE]

Also had to rotate tires :burnout:


Also Speaking of tires. Make sure your tires have the right PSI....my lazy ass never bothered with that. I would drive year long on M/T ET street drag radials with 18PSI in the back. lol

[BlackTAWS6]

Man, that stinks, 80 mph @ 2100rpm, I can be at 90 @ 2,000 rpm ---->M6

[SeVeReDiStOrTiOn]

watch those shops....some will just leave the #8 plug in cause there's no way for you to know unless you pull the plug yourself. You might be able to reach back there and pull the wire off and see if it's new...doubt it though.

[TwistedSS]

Yeah i read that too. I changed my plugs for the first time a few months ago; it really wasn't all that bad. I promise you could do it yourself. Check out the 'how to' on http://www.installuniversity.com/install_university/index.htm

[silverTA2002]

I get about 200 miles per tank around town (heads/cam not installed yet).

It could be a clogged cat. That can kill power and fuel economy.

[KP1]

Well, it looks like you are in northern KY, so you are buying reformulated gas. Some people call it oxygenated gas. I live in N. Ky also and my mileage is around 190 each tank. Some driving is strictly short drive city type driving and some mileage is I-75 & I-275. Long & short of it is the Ashland reformulated formula was required by old governor Collins about the time you were born and I guess that's still what we have here. I do believe that since the hurricaines and the Bush executive order to reduce the boutique blends required by the EPA, I am getting better mileage.

For a tune you should consider LT1 Dave. He costs less than the other guys and he can get you real close w/o the dyno because he has done so many lsX combinations and has records of what worked best from his dyno tunes. He will also do a dyno tune if that's what you want, but he only does them once a month or so and the spots fill up fast. He's on the Cincinnati F-Body web site as a sponsor. Nice guy and his prices on all the work you may need aere reasonable the last time I was there. He did my tune for $100. I think he has raised it to $150 recently. Made a big difference on the way my car runs.

[02z28ls1]

:hitit: dude -you're getting 10mpg-do the math.Something's wrong-my car gets over 30 on the hiway-on the worst day still gets 15 mpg(around town and alot of idling through drive thru and ATM stuff).The AC doesn't drag down mileage like people think-windows up decreases drag and offsets power useage.You say it's a new engine-built to stock specs.Did you switch everything over from the old engine(which was working properly before).If so there has to be something screwed up w/the motor.They put old spark plugs in new motor? that's strange!

[Zboner]

Well, it looks like you are in northern KY, so you are buying reformulated gas. Some people call it oxygenated gas. I live in N. Ky also and my mileage is around 190 each tank. Some driving is strictly short drive city type driving and some mileage is I-75 & I-275. Long & short of it is the Ashland reformulated formula was required by old governor Collins about the time you were born and I guess that's still what we have here. I do believe that since the hurricaines and the Bush executive order to reduce the boutique blends required by the EPA, I am getting better mileage.

For a tune you should consider LT1 Dave. He costs less than the other guys and he can get you real close w/o the dyno because he has done so many lsX combinations and has records of what worked best from his dyno tunes. He will also do a dyno tune if that's what you want, but he only does them once a month or so and the spots fill up fast. He's on the Cincinnati F-Body web site as a sponsor. Nice guy and his prices on all the work you may need aere reasonable the last time I was there. He did my tune for $100. I think he has raised it to $150 recently. Made a big difference on the way my car runs.

i cant drive my car now anyways, im in a law suit with Dry ridge Toyota.

[csteingraber]

dont forget to get some no residue electrical cleaner from radioshack and clean the 3 little sensors in the MAF. mine were almost black and they're supposed to be silver. i recently posted about bad mileage on ws6zxr forum. i had ported maf ends. i put stock back on (i was told i have to or itll run richer) and cleaned the sensor, and then i reset the ECM. and i keep it at or below 1500 rpm! i'm driving like a grandma. if that dont work i might have to do plugs and wires, i was told not to get iridium ngk tr55's to get the copper ones cuz they conduct better. thats fine with me since iridium are like $8 a pop and copper cost $20 for all 8. im assuming the copper just have to get replace a little sooner. and MSD 8.5mm wires which are $65 for the set. I checked prices at motorsporttech.com. but some one's telling me the 02's could be bad? i thought i should get an ses light if there are. if they're bad i was wondering if 02 sims would fix it cuz im on a tight budget. i was told my fuel injectors could be messed up if i used fuel injector cleaner regularly. i'm still waiting to see if the mpg has changed. i get about 13mpg. with 273's and ac off all stock. k&n.

MY t/a is for sale $12 takes it (908)397-3423, NJ.

[02transam]

stock 2002 T.A. conv M6 28-30mpg

Kevin

[KP1]

I am just amazed at the mileage some people are getting. I drove my 2002 SS M6 800 miles on a trip on open interstate roads driving about 70mph and I never got more than 20mpg on any fill-up. Tires @ 30, lid, filter, iridium plugs & new wires,synthetic oil, free mods.

[02z28ls1]

I've never taken any long trips with my Camaro Z-but I've got a OBD2 monitor on the dash that reads out all computer sensors and also gas mileage -in several different ways.Out on the highway I can get over 30 mpg.Your mileage drops drastically around town with the stop and go,heavy traffic,idling thru fast food and ATMs.I drive mainly city type traffic and the average is around 16-18 mpg.But I don't understand how you would only get 20 mpg on open highway-must be jazzin the throttle alot.

[98_Formula]

i gotta '98 formula, ls1 A4 273s, bolt ons and catback, i get 275 per tank, i usualy fill up after 250 miles with room to spare...

[Marc '99T/A]

You also have to consider that the '98's had a 15 gallon gas tank, while everyone else got bumped up to a 16.8 gallon tank in '99.

[KP1]

Yeah. 275 divided by 15 is 18.3 MPG. Divided by 14 is 19.3 MPG. Divided by 13 is 21.1 MPG. That's real close to to the MPG I get on my 02 SS M6 Convertible.

I'm not jazzin' the throttle, just driving normal. And those fuel monitors aren't accurate. My Cadillac has a monitor and sometimes it indicates that I'm getting 79 MPG, and a full size DeVille can't do that. The only way you know how many MPG you're getting is to fill your tank, set your trip meter to zero, drive the car, fill the tank again, then divide the miles driven by the # of gallons it takes to refill the tank. If you're not doing that, you really don't know what your MPG is.

I have read that some people have replaced their o2 sensors even though no codes were set, and their mileage has improved. I guess it is possible that my o2 sensors are off, but my math isn't. I can baby the car through a tank coasting to traffic lights and getting to the higher gears very rapidly, or I can wind it out a bit and get into the throttle here and there, and the difference in mileage is nominal. I'm getting ready to do a H/C swap and when I do I'll change out the o2 sensors just for fun. In the big scheme of things, considering the cost of gaskets and ancillary parts to do the swap, the o2 sensors aren't that expensive.

I just gotta get me one of those MiniCoopers that looks like a Camaro SS convertible.

[00slpstreet]

what is a stock ls1 4th gen suppose to get on a full tank ...no a/c highway/city?

[csteingraber]

the stock mpg depends on the transmission, i didnt look this up right now but off the top i think an auto (non-ws6) w/ 2.73's has 19c 26h mpg rating. the 6speed has i think 19c 28h or something like that. oh by the way i now get an average of 21 mpg thats city and hightway. i was getting 13 average. all i did was clean the MAF and put stock maf ends on (I had ported) and reset the computer.

[Sky042]

This may be a stupid question but have you checked the obvious.
When you fill up from empty how many gallons are you putting in. Are you sure that it's not just as simple as a faulty fuel level sending unit?

[00slpstreet]

hummmm....i have a stock air box now but iam buying an slp cold air full induction, lid , filter, and maf do you think this will help?

[MadSeason]

I've never taken any long trips with my Camaro Z-but I've got a OBD2 monitor on the dash that reads out all computer sensors and also gas mileage -in several different ways.Out on the highway I can get over 30 mpg.Your mileage drops drastically around town with the stop and go,heavy traffic,idling thru fast food and ATMs.I drive mainly city type traffic and the average is around 16-18 mpg.But I don't understand how you would only get 20 mpg on open highway-must be jazzin the throttle alot.

Which OBD2 Monitor do you use?

[MadSeason]

hummmm....i have a stock air box now but iam buying an slp cold air full induction, lid , filter, and maf do you think this will help?

I'd go with the airfilter but forget the MAF, our stock ones can hang on until about 450 engine HP before it becomes a restriction. If you want to go big just get the Z06 one from a 01 or later along with a harness and get your computer programed to use its table. If you go in for any tuning later with the SLP MAF it has a resistor in it that calibrates the signal for a guestimate and isn't consistant at all. Spend the money on something else IMO