If you remember, I had some bad gas, and it caused my car to run rough, so I added some fuel treatment, and you guys gave me the advice to check all the fuel injectors, and sensors, then get the fuel rail flushed.
Well, I did it, and the car idles much smother, and I am getting about a 10% better fuel economy.
I went from around 19.8 MPG to 21.9 MPG!
I have put about 2000 miles on the car, since i had it done, and I am very pleased with the results.
The flush cost me $113 at the dealership, and they checked all the sensors, and did a power balance check.
All of m ydriving is highway driving, at 78 MPH, with about 5% of my driving, in neighborhoods, and in town.
Great to hear. I've been measuring good mpg improvements too, but I only fill up around 2x a month, so I'm waiting for more data before feeling too confident in the results.
13901 posts
1990 Q45 325,000 miles 19.9 years ownership
Marietta , Georgia
4-30-2002
5:17 AM 7/10/2003
Just an annual event on mine along with a fogger plenum runner TB clean and a hand wipe of the bottom of the TB and hand clean of the MAF screen, when I change the air and fuel filter........every May/June. A can of BG 44k prior to each 90 day oil change and the above will usually keep the idle perfect and the power as much as possible considering mileage.
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31502 posts
LETS GO VANNING
ITS A PARTY IN THE USA
5-5-2003
5:17 AM 7/10/2003
Awesome, Jeff! After adding a can of B12 Chemtool I noticed significant mileage improvements as well, about 2mpg, and idling is far smoother. Next step: Rail flush!
1992 Cadillac Seville STS, 1998 Ford Mustang, 1991 Saab 900 Turbo convertible named Ducky
Quote, originally posted by MinisterofDOOM »
Get out of my gene pool. And take your ES350 with you.
Yes, a quarterly soaking of the MAF with brake cleaner has done wonders for the idle smoothness, as well. I didn't see much change in the mileage, but if I let it go too long, the car starts to load up and run like an American car.
hm.. on my 96K 97Q after recent BG service I didn't notice _any_ changes. Not that I was complaining about anything but I was expecting some effect. Was it done at all? :D
Right after service my mileage was: first tank 17.5, second 19.9 with mixed driving (higways prevail though). Somewhat low for the second gen Q. Is it a good idea to replace sensors and may be thermostat?
$113 including power balance test? It's very good. I was charged 120 and no balance test. They asked another 100 for it.
56 posts
drifting, engine tuning, music
Ontario,CA
7-23-2003
re: bad fuel mileage
5:17 AM 7/10/2003
I don't think you're getting the best possible mileage out of your car. I have an '89 240sx w/ KA24E SOHC, HyperGround Kit, Magnecor ignition wires, SplitFire 3xPlatinum plugs, port/polished head, throttle body, intake plenum, manifold (removed SCV valve (secondary butterflies)), air filter adapter, polished MAF sensor (only on main air inlet), Hotshot Headers (and gasket are port-matched to the head), ThermoTec exh. wrap, Random Tech cat, new 180SX fuel pump/in-tank filter, new 195cc injectors, 300ZX fuel filter, Injen intake, HKS Super Mega Flow air filter, and STOCK EXHAUST (race exh. is for the races only, cops y'know). Everything on the car is in excellent condition, sensors, valves, vacuum hoses, car is driven hard but very well maintained. According to my measurements, I'm getting about 26MPG. How accurate are my measurements? Simple, do the only way possible to find the exact figures. You get two (2) separate 1gal. gas containers, drive your car until it's empty, RESET THE MILEAGE COUNTER, add 1gal ONLY, and Drive you car on the freeway. Where I live, it's 30-35 miles to Downtown Los Angeles, and I had to go anyways because it's the only place that I could find that carries the newest Japanese race/drift videos and mags. I ran out of gas exactly 26 miles later doing 85-90 on the fast lane with light traffic on a Saturday, took me about 25 min. getting there. Now use the other gal. of fuel to get you to a gas station. This is just my personal experience that I pass on for others to read. Hope it helps you in some way. [email]superslidestye@excite.com[/email]
JDM Drifting is the only path to true performance!
my car is running rich (i hope the bad knock sensors are causing that) and i've got a lead foot so gas mileage doesn't exist for me. i'm happy when i get over 17 mpg. good gas mileage is what the bike is for, i get 40 mpg in the city, no highway because the gearing is horrible and it leaks oil when held at constant freeway speed. hmm, maybe that's because all the engine gaskets are 23 years old...
31186 posts
94 Q45t 5 speed NICO Track Slut
Anderson and Angola IN
2-23-2003
5:17 AM 7/10/2003
To be honest, I went through all that trouble to find out that the numbers were the same using my way and your way........ But mine is a tad easier!!!!
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