3800 Everyday Driving Questions...
- Thread starter Mikes1998GTP
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That is way to low for the mods you have. You should probably have 18-20 mpg city and 24-30 mpg highway. Things to check are PCV valve, fuel filter, air filter, oxygen sensor, and your CAT. If you still have the stock CAT or oxygen sensor, then they could be shot. My stock oxygen sensor acted perfecty normal throughout its entire life. I changed it for preventative maintenance and found out that it was reading richer than it should have. If your CAT is clogged, it could easily drop mpg on the car. The plugs and t-stat you have are good for performance and reducing knock, but will hurt mpg.
Mike
Mike
p-shift did help...and yeah your car is getting shitty gas milege
i was using a 3.25 and and AFC cranked up quite a bit and was getting still close to 20
try the normal maintance stuff
check your cruise timing, see if its low
you should be seeing high 30s. i think eric tunned his for low 40's IIRC
i was using a 3.25 and and AFC cranked up quite a bit and was getting still close to 20
try the normal maintance stuff
check your cruise timing, see if its low
you should be seeing high 30s. i think eric tunned his for low 40's IIRC
change your fuel filter every 15,000 miles or so.......but im guessing you HAVENT since you asked about it. its all about the filters. and yes the CAT/O2 sensor is a silent killer. Dont take off your SC pulley..... that shouldnt help any. then you just have non-moving parts blocking your airflow into your engine. I jsut dont see how it would help. How many miles are on your car?
I just hit 68,000 miles for a 1998. I drive literally about 2mi roundtrip each day to work, so I'm lucky on that. What's disappointing is that I had my vehicle appraised at the dealership and although I need to recharge the A/C and get new rear brake pads, they STILL only offered me $3200 for the grand prix. Said the market value is low with rising gas prices and the need isn't all that great.. I'm sure the Carmax guy on here might even add a comment on that too, but it just sucks! I still owe about $4700 on her and I'm getting tubed on the trade-in, so I'm holding out for a couple more months, unless I can significantly improve my MPG's, even to 20MPG, I'd be happy... but like a lot of the guys on here, everytime I pull up next to a tampon car like the Mustang (funny pic by the way) or a vette or whatever, I feel like I have something to prove... you know?
So try the 02 sensor, the fuel filter and Vogel maybe gut my cat?
So try the 02 sensor, the fuel filter and Vogel maybe gut my cat?
like steve said, my car's not a 12.0 car yet, but i saw 28mpg coming home from the cam install. and i have gotten over 30 numerous times after using the PT. part throttle timing is the shit! i would see if you cant find someone with a PT, and see if they could help you out. but first like everyone else said, start with a f/f, then try the pcv, at least see if it's sticking. also try a bottle of the fuel system treatment. i could get you some really good shit from GM for a small cost.
also driving less than 5 miles a day doesnt help much, maybe try to drive it like 100 miles in a week after you do the maintence. you should def. be getting at least 18-20 in town
also driving less than 5 miles a day doesnt help much, maybe try to drive it like 100 miles in a week after you do the maintence. you should def. be getting at least 18-20 in town
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