poor M.P.G.s on SC400 today
#1
Lexus Champion
Thread Starter
poor M.P.G.s on SC400 today
My car is fully tuned up, all stock except BFI and new cat. conv. I drive conservative, and with the A.C. on very little. Filled up today and got 14.2 MPG. Im wondering if when I filled up before if maybe it wasnt comp. full. I seem to have to turn the filler nozzle upside down to gas-up. I have checked a year ago and got 20.
#3
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
The way you drive, where you drive and road conditions have a HUGE effect on your miles per gallon. With 100% driving in the city, my average is usually 15-16 miles per gallon. But driving like a grandma I was able to squeeze out 18.1 mpg in just the city. It maxes out at 25mpg on the highway.
Your 20 miles per gallon seems like more highway then city, and the 14.2 seems like just city. Is that right? If it is, those numbers seem okay. (especially with the a/c on)
Your 20 miles per gallon seems like more highway then city, and the 14.2 seems like just city. Is that right? If it is, those numbers seem okay. (especially with the a/c on)
#4
Lexus Test Driver
For the record, I get around 19-21 with the AC on around town. Try again to make sure you started with a full tank. If you are still having that bad of mileage, you might look into cleaning your sensors and replacing the o2's.
#5
Lexus Champion
Thread Starter
It seems like with the A.C. on last night, I had a pretty good hesitation taking off at stop lights. Runs good at 20 mph on up. The above noted mpg was with out air, reg. conservative driving, name brand prem. gas. Went with Autolite platinums, wish I had went with Denso platinums. But I got good mileage with the Autolites when they were fresh installed. When I put in fuel injector cleaner my hesitation goes away.
#7
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
Check out this thread:
https://www.clublexus.com/forums/per...mely-rich.html
Trending Topics
#8
Lexus Champion
Thread Starter
You know a couple of years ago I had been out driving, came in and let it set for a while, my dad was in town. I fired it up and we were standing outside the car at the rear and there was this thick white smoke. I thought it was water in the mufflers. It hasnt done it again for 2 yrs. Ill keep a close eye on it. Dosent run better when cold, but Im sure a new ECU would be nice, wonder what Lex. dealer wants for one?
#9
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
your best bet would be to get a used one in the classifieds for around $100. The Lexus dealership is going to want at least $1000 for an ecu.
If you think its the ecu, try getting the capacitors replaced. That is what usually goes bad in them. I'm doing that this week.
If you think its the ecu, try getting the capacitors replaced. That is what usually goes bad in them. I'm doing that this week.
#13
Lexus Champion
Thread Starter
My car def. runs just as good when warm, still havent put enough miles on to recheck the mileage. I had made a note in my receipt box on 5-13-06 22.8 mpg. I also cleaned and installed a new ground cable shortly after I saw the white smoke 2 yrs. ago.. Currently when you first start it, by looking you cant tell if its running as far as any kind of smoking.
#14
Lexus Test Driver
iTrader: (7)
Join Date: Oct 2006
Location: SoCal & SLOcal
Posts: 927
Likes: 0
Received 0 Likes
on
0 Posts
Usually the smoking is when its really cold outside and the car is at ambient temperature internally.
If its not doing any of the symptoms described in the other thread then it might not be the ecu.
Have you checked your air filter and tire pressure. I know for a fact low tire pressure will make your mileage a lot worse.
If its not doing any of the symptoms described in the other thread then it might not be the ecu.
Have you checked your air filter and tire pressure. I know for a fact low tire pressure will make your mileage a lot worse.