Question about 1999 Lexus RX 300

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I'm getting extremely poor gas mileage on my 99 lexus rx 300. New plugs,air filter, oil change and checked to see if my tires are properly inflated!One code came up 0441 or 0446, I can't remember.

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  • Master
  • 575 Answers

You have a problem in your Evaporative Emission Control System. Not much you can do without the right equipment. A mechanic needs to diagnose this with his testing tools. Good luck!

Posted on Dec 22, 2016

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Posted on Jan 02, 2017

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SOURCE: '99 CR-V getting crappy mileage

replace your fuel filter and clean out your injectors with Pro-Guard. Not sure it will work. But its worth a try..

Posted on Aug 05, 2008

  • 4044 Answers

SOURCE: 2003 CHEVEY BLAZER POOR GAS MILAGE Just tuned up ,

What grade of fuel are you using? There are many conditions that effect gas mileage. The way a vehicle is driven, is it shifting correctly, flooring it to get up to speed from dead stop also known as Jack Rabbit starts, driving with the defroster on when it isn't needed or the setting just above that can be used. Back in the 90's most car manufacturers made a change to their heating.cooling system that caused the AC compressor to kick in when the selector was set to defrost. This puts drag on teh motor and decreases gas mileage. Build up on valves and low compression in the firing cylinders will cause you to lose gas mileage as well. Do a compression check on the motor to make sure you don't have abnormally high compression or low compression on cylinders and use a bottle of gas treatment in your fuel to clean some of the carbon build up from injectors and valves. Also start using the Mid grade fuel. Not the High Octane in your area. In Texas we typically have 3 choices 87, 89 and 93 to choose from. Low grade is enough to run the vehicle but performance is low as well as mileage. I use the 89 octane for better performance and better mileage. The High Octane or 93 isn't really good as it leads to higher carbon build up on the valves. Also check your oil often and make sure your changing it every 4000 miles at the longest. All of this along with making sure you change the Air Filter every 5000 miles will increase your mileage.

Posted on Jan 25, 2011

  • 14585 Answers

SOURCE: 1999 buick century 85,000 miles

When you do a tune up you should replace the cap, rotor, plugs, wires,airfilter, and fuel filter, this will insure that you get the best mileage. Also have the coil checked, for proper resistance. If it starts to get weak it will throw a lower than normal voltage spark. You can not look at spark plug wires and tell if they are good, this can only be done with an ohm meter. The resistance should be 3000 to 6000 ohms per foot of wire. One other note is if your car feels sluggish or lacks power is to check the catalitic converter. These clog up and stop air flow thru the engine. There are many many things on cars that will result in poor gas mileage. A good mechanic doesn't go by just the codes a car spits out, they have to read the numbers and diagnose what is wrong.

Posted on Jan 22, 2011

  • 3 Answers

SOURCE: buick regal 92 3.8L Horrible fuel mileage

Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.

Posted on Mar 16, 2010

michigan man
  • 3533 Answers

SOURCE: Horrible Gas Mileage

i would change the fuel filter and i would take a flashlight and to make sure none of my fuel injectors are leaking and i would also put the car on ramps and put something behind the rear wheels and check all of my gas lines under the car as while.

Posted on Feb 14, 2009

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199 lexus es300 poor gas mileage


CHECK YOUR AIR FILTER,REPLACE IF DIRTY,REMOVE SPARK PLUGS AND CHECK THEIR CONDITION.CHECK YOUR TIRE PRESSURE.FUEL INJECTORS MAY NEED CLEANING,DO YOU HAVE LESS GITTY UP ON SPEED.

Sep 27, 2013 | 1999 Lexus ES 300

1 Answer

Poor fuel milage


try changing fuel filter and making sure tire pressure is correct keep your car clean so air can flow freely and try an oil change all these factor into good gas mileage and you could try adding new plug wires to your tune up

May 14, 2012 | 1998 Honda Passport

1 Answer

My 1992 isuzu pickup use too much gas. how can I inprove my mpg.


I'm not sure of the mileage on your truck, but there are a number of things that you can do to improve your gas mileage. If the truck has over 100,000 miles, the next time you change your oil you can choose engine oil that is specifically designed for high mileage vehicles (make sure that it is the correct weight for your vehicle) Change your air filter, this has alot to do with fuel efficiency. Make sure that you get your tires rotated and balanced every 5,000 miles. Also check your tread wear on all 4 tires. If you have significantly uneven tread on your tires this can have a drastic effect on mpg. Check your plug wires: if they look worn and old replace them. If they appear to be in good shape then you can get away with only getting new spark plugs. If you are really dedicated to the truck you can always opt for a fuel system flush at your local service station, I know they offer this service at Midas in my area for $99. Lastly I used to have 98 Stratus that got poor gas mileage. I started putting a bottle of the STP treatment (in the black bottle not red) during every fill up and it averaged an extra 40 miles per tank. Hope this helps.

Mar 28, 2011 | 1992 Isuzu Pickup

1 Answer

Does the fuel filter affect gas mileage


there are lots of things that can affect gas mileage. if the spark plugs and wires are worn out, the air filter being dirty, dirty fuel filter, proper inflation of the tires, O2 sensors that are contaminated and performing poorly. the first thing to do would be that the engine is in good working order, as in no check engine light, no misfire, etc. a poorly running engine will put out terrible gas mileage. then you can start with the things i listed.

Feb 21, 2010 | 2002 Chrysler 300M

3 Answers

2002 ford focus is geting poor gas milage


Tune Time.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.

New oil and filter
8) new plug wires every 80000 miles.

Nov 07, 2009 | 2001 Ford Focus

1 Answer

What is the cost of a 90000 mile service for a Lexus RX 300?


$700

timing belt
idler pulley
water pump
timing belt tensioner
valve cam gasket
coolant flush
spark plug
oil change
pcv valve
tranny oil change
differential fluid cahnge
drive belt
upper/lower radiator hose
brake system flush
air filter

good luck,i hope this help pls dont forget to rate me thanks

Jun 05, 2009 | 2001 Lexus RX 300

1 Answer

Horrible Gas Mileage


i would change the fuel filter and i would take a flashlight and to make sure none of my fuel injectors are leaking and i would also put the car on ramps and put something behind the rear wheels and check all of my gas lines under the car as while.

Feb 14, 2009 | 2000 Chevrolet S-10

1 Answer

Lexus RX 300 Yr model 2005 - Service Maintenance Tips


Hello Ben,
Service intervals in North America are oil changes at 8000 km, schedule maint with cabin filters and air intake filters, tire rotation and brake inspection, at 16,000km intervals.Given where you are located under extreme heat you could advance the intervals by 20% early.
If you have your manual package this will be detailed inside. Toyota developed a high grade oil filter years ago with exceptional filtration. If you decide to use aftermarket filters change oil around 5,000 km instead. Don't touch electronics until the vehicle indicates and issue. Trans fluid around 72,000 should be fine.
All these should be outlined in your manuals and in theh warranty cover booklet as well.
You have chosen and EXCELLENT vehicle

Jan 22, 2009 | 2008 Lexus Rx 350

1 Answer

'99 CR-V getting crappy mileage


replace your fuel filter and clean out your injectors with Pro-Guard. Not sure it will work. But its worth a try..

Jun 23, 2008 | 1993 Honda Civic 4 Door

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