Go Back   Club Lexus Forums > Lexus Model Forums > RX Models > RX - First Generation
Sign in using an external account
Register Forgot Password?

I have a bad gas mileage, how about yours ??

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 08-01-07, 11:19 AM   #31
bowen.chau
Rookie
Trader Score: (0)
 
Join Date: Jul 2007
Location: -
Posts: 82
Default

The spark plugs have been changed last week ... before the spark plug change, the gas mileage is still very low.

And the MAF sensor has been cleaned several time.

Anyway, we will change the MAF sensor tomorrow and let's see what will happen.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!

Last edited by bowen.chau; 08-01-07 at 10:49 PM..
bowen.chau is offline   Reply With Quote
Old 08-01-07, 10:49 PM   #32
bowen.chau
Rookie
Trader Score: (0)
 
Join Date: Jul 2007
Location: -
Posts: 82
Default

Okay, it's me again.

P1130 and P1135 is the code.
Changed the MAF sensor over the air box. Still, no change in MPG ... Still P1130 and P1135. Will change the B1S1 O2 sensor in the afternoon and see what will happen.
bowen.chau is offline   Reply With Quote
Old 08-02-07, 10:55 AM   #33
bowen.chau
Rookie
Trader Score: (0)
 
Join Date: Jul 2007
Location: -
Posts: 82
Default

Alright, changed the MAF and 2 O2 sensors and the car runs smooth and obtain a good MPG again !~

Thanks, Lexmex and all other people who has helped me.
bowen.chau is offline   Reply With Quote
Old 09-01-07, 10:21 AM   #34
rachel
Driver School Candidate
Trader Score: (0)
 
Join Date: Aug 2007
Location: Ohio
Posts: 16
Default

I get 20 mpg, I commute 75 miles one way to work.
rachel is offline   Reply With Quote
Old 09-01-07, 10:30 PM   #35
zombie
Lead Lap
Trader Score: (1)
 
zombie's Avatar
 
Join Date: Mar 2006
Location: SugarLand,Texas
Posts: 487
Default

Quote:
Originally Posted by rachel View Post
I get 20 mpg, I commute 75 miles one way to work.
awd or fwd?
__________________

http://www.cardomain.com/ride/2671523
99 rx300 170k+ miles
wrecked May 2011
zombie is offline   Reply With Quote
Old 09-02-07, 08:34 PM   #36
AlexusAnja
Moderator
Trader Score: (0)
 
AlexusAnja's Avatar
 
Join Date: Mar 2006
Location: NY/NJ
Posts: 4,095
Default

AWD, I get about 16 local and at best now about 19 highway, although I haven't done a full tank of highway in a long time. I don't commute with my RX, it's my "baby"
__________________
'10 MDX blk/blk
'04 LS430 CL blk/blk (I'm on cloud 9)
'99 RX green/beige - (still smashing, but it's the beater)

N:Quebec E:Boston W:Chicago S: Orlando
AlexusAnja is offline   Reply With Quote
Old 09-18-07, 12:32 PM   #37
bluovalguy
Driver School Candidate
Trader Score: (0)
 
Join Date: Aug 2007
Location: OK
Posts: 8
Default

Mine is horrible. I used 3/4 of a tank in 140 miles.
bluovalguy is offline   Reply With Quote
Old 09-25-07, 01:03 PM   #38
lexus114
Lexus Champion
Trader Score: (0)
 
lexus114's Avatar
 
Join Date: Aug 2007
Location: Bethlehem Twsp. Pennsylvania
Posts: 3,948
Default

if you guy`s are not using premium fuel,that might be some of your problem. it call`s for 91 octane for engine performance, and durability. knock sensor retard`s the timing on regular unleaded. And not as much power,or fuel milage.
lexus114 is offline   Reply With Quote
Old 09-25-07, 01:54 PM   #39
bluovalguy
Driver School Candidate
Trader Score: (0)
 
Join Date: Aug 2007
Location: OK
Posts: 8
Default

I am using premium gas (a full tank of it to go 130 miles).
bluovalguy is offline   Reply With Quote
Old 10-02-07, 10:25 PM   #40
mckellyb
Driver
Trader Score: (0)
 
mckellyb's Avatar
 
Join Date: Jul 2003
Location: Texas
Posts: 176
Default

MPG is horribly variable based soley on driving style, terrain and traffic environment.

My wife's '02 AWD had achieved over 30 MPG, that's not a typo, on several tanks when she's followed me while I've been driving our big diesel pusher motorhome. Top speed is 75 or so, and typical crusing speed is 62. Acceleration is rather lazy...at least for her. For me, the 5.9L Cummins is working it's heart out trying to move 32K lbs. from a standstill. For the 40 foot motorhome, when towing the Suzuki Grand Vitara we used to have, 0-60 MPH was 55 seconds. Slow is a poor description.

Sometimes she'd ask me over the FRS radio, "what's the problem?" For a while, I had a flaky oil pressure sending unit which would severly retard fuel delivery and turbocharger boost, but it was fixed at this point.

I'd have to reply, "nothing, this is a 6% grade and you've been seeing full-throttle since before we got to it."

Typical MPG in our Vegas home is about 19, but traffic here is truly bad and A/C use is mandatory almost year-round. The highest I've seen on the computer for a full tank was 32 and change. Had close to 600 miles on that tank....

FWIW, we've used only 87 octane, 85 at high elevation.
__________________
Kelly B
'02 AWD, 121K miles, has everything but the trailer hitch, my wife's ride on BFG A/T ko tires
'05 Cadillac STS, Northstar, 122K, my daily-driver, ate a $2K transmission @ 113K
'99 Bounder Diesel 39Z, 128K miles, 9 provinces, one territory, and 49 states visited with it
mckellyb is offline   Reply With Quote
Old 10-03-07, 01:50 PM   #41
bluovalguy
Driver School Candidate
Trader Score: (0)
 
Join Date: Aug 2007
Location: OK
Posts: 8
Default

Granted, mileage will vary, but there is no reason at all that my 66 mustang with a 289, a 3 speed auto tranny, and more than a few performance mods, should be getting better mileage than the rx 300. Freeway is the only place the lexus' mileage is better, and only then because the mustang is turning over 3000 rpm's due to the 3 speed.
bluovalguy is offline   Reply With Quote
Old 11-11-07, 05:43 PM   #42
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,382
Default

We have talked before about the IACV valve on the throttle body. Now some have removed the IACV valve completely to clean it out, this is also good to see how the valve is functioning itself. However, I wanted to show a little advanced step without having to remove the IACV to clean it.

Note below the blue arrow. This is running along top the air assist hose that connects to the engine block through some hoses and goes into the IACV valve at the end of the arrow.
Attached Images
 
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 11-11-07, 05:46 PM   #43
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,382
Default

Now I disconnect the air assist hose and you see the valve.
Attached Images
 
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 11-11-07, 05:50 PM   #44
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,382
Default

Then you want to shoot in the hole where the blue arrow is with carb cleaner or other engine degrease (actually I used something akin to liquid wrench that also worked well) and whatever you spray in there, will come out where the yellow air is pointing. For me, it was a little black at first and then clearer.
Attached Images
 
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 11-11-07, 05:55 PM   #45
Lexmex
Super Moderator
Trader Score: (0)
 
Lexmex's Avatar
 
Join Date: Apr 2004
Location: Miami, Florida
Posts: 16,382
Default

Now in the previous photo you can stick a small plastic cup or several sheets of paper towel underneath to catch the residue.

Next step is the this piece circled in blue. This plastic piece is where the air assist hose from the valve on the IACV valve goes to (do also clean that hose with some cleaner). Its function is to divert the air to the front and rear bank. This also gets dirty and I also had a bit of residue in here, too.
Attached Images
 
__________________
Homepage of my 1999 RX300 AWD
Lexmex is offline   Reply With Quote
Old 11-11-07, 05:55 PM
 
 
 
 
Reply

Tags
air, bad, battery, camshaft, change, effect, flow, fuel, gas, lexus, mass, mileage, mpg, rx300, sensor

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2001 LS430 suggestion on body kit fchungi2 LS430 5 12-01-13 12:52 AM
Changing the suspension C240 Suspension and Brakes 0 07-30-13 10:34 AM
GPS Map software for Indonesia hjbb RX - Third Generation 1 02-19-13 04:22 PM
Toyota Harrier Rear window? 033rierrah RX - Second Generation 3 11-26-12 03:40 PM
Speaker Problem - searched high and low RuninRoach RX - Second Generation 15 09-14-12 01:16 AM

All times are GMT -7. The time now is 01:58 AM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info