RX - 2nd Gen (2004-2009) Discussion topics related to the 2004 -2009 RX330, RX350 and RX400H models

Excessive fuel consumption RX 330

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Old 07-06-17, 03:30 AM
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Gripz
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Default Excessive fuel consumption RX 330

Of late ive noticed that RX 330 2004 model has been consuming fuel uncontrollably.
Ill appreciate if anyone can help me with the solution,
Old 07-06-17, 05:48 AM
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Lexuswiz
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When you say uncontrollably, what is your current fuel consumption? Also are there any check engine lights on?
Old 07-06-17, 06:08 AM
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05RX330AWD
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Same here, although now towards the summer months here in Canada the MPG has improved slightly.
I have read on a consumer report the RX330 was tested as a new vehicle at around 14 MPG combined City/ Highway, which is what I am at presently, no CEL & with mostly city driving
Winter, worse, 10- 12 MPG.
After changing spark plugs, air filter, cleaned the map sensor, filling with Premium 91 & more....
at this point, I am living with the fact the RX330 isn't as fuel efficient as a Toyota Corolla.
Old 07-06-17, 08:45 AM
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mandyfig
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You should be able to get at least 20 mpg. I do get 24 mpg, all highway driving.
Old 07-06-17, 09:10 AM
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05RX330AWD
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Originally Posted by mandyfig
You should be able to get at least 20 mpg. I do get 24 mpg, all highway driving.
That sounds about standard for FWD, differs to less with AWD.
Old 07-08-17, 06:19 PM
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LuckyPants
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Originally Posted by 05RX330AWD
That sounds about standard for FWD, differs to less with AWD.
I usually get 20-22 MPG on my 2004 AWD in mixed driving using regular (87 octane) gas.

And the RX will *never* be as fuel efficient as a Corolla, even at it's best.

Maybe a faulty O2 sensor? Have you had the codes checked?
Old 07-09-17, 02:53 AM
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05RX330AWD
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Now I know why you chose LuckyPants for your CL Member name...
20-22 MPG.
I was actually being sarcastic with the Corolla comment, no CEL codes, I did verify the O2 sensors with Techstream, all appears normal.
Old 07-09-17, 10:18 AM
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FactoryRX
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Well I own a 2004 RX 300 awd ( I guess the 2nd gen 300 wasn't sold in the USA ) , And I get, at very best being ultra careful on the gas, 24 mpg in the highway...... With mixed driving not paying attention to how I drive, I get around 18 mpg....
Frankly I was expecting low gas mileage before buying , but not as low as this.... I've Always owned High displacement gas cars but this is my first suv.... I guess the mileage is killed by weight and aerodynamics !
Old 07-10-17, 12:30 PM
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05RX330AWD
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Oddly enough after removing an Ignition Coil due to a PO304 code & putting it back, details here:
https://www.clublexus.com/forums/rx-...0304-code.html
Now I'm getting 19 MPG City instead of 14 MPG City, , also, I did disconnect the negative of the battery to take out the Ignition Coil.
Old 07-10-17, 11:30 PM
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FactoryRX
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The ecu probably was correcting the mixture because of the misfiring coil...
Old 07-11-17, 03:23 AM
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Originally Posted by FactoryRX
The ecu probably was correcting the mixture because of the misfiring coil...
Most likely when I erased the code 2 months ago & it didn't return until yesterday, the Ignition Coil wasn't performing as it should, but just good enough to not set off the code....
although the MPG was severally affected.
Old 07-13-17, 02:19 PM
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yes sorry, I thought you had the coil replaced !
Old 07-13-17, 03:23 PM
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I just decided yesterday to replace the Ignition Coil for cylinder 4 & change the 3 plugs for Cylinder 2, 4 & 6 since I finally managed to pry the stuck boot off the spark plug.
Since I disconnected the negative from battery, the RX330 reset again, haven't driven enough for evaluating the MPG again, as yet.
Hopefully it will be at least acceptable, I'll post in a few days with the result. No codes for misfires.
Old 07-13-17, 07:41 PM
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ToledoRX
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Originally Posted by Gripz
Of late ive noticed that RX 330 2004 model has been consuming fuel uncontrollably.
Ill appreciate if anyone can help me with the solution,
I get about 22 mpg on mostly highway driving (1 mpg lower with the A/C on). That being said, it is not unusual for my mileage to drop below 15 mpg when driving in stop and go traffic in cities.
Old 07-13-17, 09:42 PM
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mdbrown
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My 07 RX350 averages around 18-19 mpg combined with about 60% around town and 40% highway. My foot keeps it from doing a bit better...


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