Replace your 20 - 30 year old MAF Sensor
#1
Pole Position
Thread Starter
Replace your 20 - 30 year old MAF Sensor
CRC Mass Air Flow Sensor Cleaner (Use 1995-2000 LS400 only) helps restore functionality to MAF sensors.
However, no matter how clean the sensor elements, their capacity diminishes through age or use.
On my 1999 LS400, routinely clean the MAF sensor with CRC Mass Airflow Sensor Cleaner each air filter change.
Recently a MAF trouble code arose and so cleaned MAF again.
The code dissipated, but after 178,000 miles, replaced the 21 year old MAF sensor with new purchased from Lexus....$200
Efficiency has improved appreciably, easily 15-20% with in city driving.
Not inexpensible, but payback over about 8,000 miles @ $3.00/gallon for premium and average 21 MPG
The engine is happier too...(catalytic converters, oxygen sensors, engine oil, valves (deposits), emissions system, etc.)
Transmission shifting feels more behaved.
Now seeing average 25 MPG. (Highway is 29 - 30 MPG despite LS400 has an LS430 engine transplant.)
Note: The MAF Sensor purchased from Lexus did not include the necessary rectangular rubber sealing gasket...although it is supposed to.
On information, Toyota is sorting this out.
As it is not sold separately, have Toyota/Lexus. parts counterman open the MAF box before purchase.
MAF sensor gasket
However, no matter how clean the sensor elements, their capacity diminishes through age or use.
On my 1999 LS400, routinely clean the MAF sensor with CRC Mass Airflow Sensor Cleaner each air filter change.
Recently a MAF trouble code arose and so cleaned MAF again.
The code dissipated, but after 178,000 miles, replaced the 21 year old MAF sensor with new purchased from Lexus....$200
Efficiency has improved appreciably, easily 15-20% with in city driving.
Not inexpensible, but payback over about 8,000 miles @ $3.00/gallon for premium and average 21 MPG
The engine is happier too...(catalytic converters, oxygen sensors, engine oil, valves (deposits), emissions system, etc.)
Transmission shifting feels more behaved.
Now seeing average 25 MPG. (Highway is 29 - 30 MPG despite LS400 has an LS430 engine transplant.)
Note: The MAF Sensor purchased from Lexus did not include the necessary rectangular rubber sealing gasket...although it is supposed to.
On information, Toyota is sorting this out.
As it is not sold separately, have Toyota/Lexus. parts counterman open the MAF box before purchase.
MAF sensor gasket
#3
Racer
Would replacing this be a benefit if I’m only seeing about 15-16mpg city? Or would you try cleaning first? 99’ with 157k. I average 28-31mpg hwy but city is pretty horrible. It has been extremely hot lately, averaging 110-115 for the last 2-3 weeks, so AC is working nonstop.
Or would this be typical of severe/extreme weather causing the fuel coming drop?
Or would this be typical of severe/extreme weather causing the fuel coming drop?
The following users liked this post:
EthanS (08-03-20)
#4
Pole Position
Thread Starter
Would replacing this be a benefit if I’m only seeing about 15-16mpg city? Or would you try cleaning first? 99’ with 157k. I average 28-31mpg hwy but city is pretty horrible. It has been extremely hot lately, averaging 110-115 for the last 2-3 weeks, so AC is working nonstop.
Or would this be typical of severe/extreme weather causing the fuel coming drop?
Or would this be typical of severe/extreme weather causing the fuel coming drop?
Last edited by YODAONE; 08-02-20 at 09:29 PM.
#6
Worst I've seen from a tank is 17mpg during the summer with A\C running. Dense city driving <40mph, tons of traffic. Typical city is 18-20mpg. Mixed tank is usually 23 or so.
Highest I've seen is 32.5 on a half tank with a tail wind and a thousand foot elevation loss. Highest "normal" I've seen is 28.2.
However, I'm at altitude, which helps things slightly.
Highest I've seen is 32.5 on a half tank with a tail wind and a thousand foot elevation loss. Highest "normal" I've seen is 28.2.
However, I'm at altitude, which helps things slightly.
Last edited by 400fanboy; 08-03-20 at 12:45 AM.
#7
Yoda- I know the 95-97 models used a different MAF sensor than the 98-00. If it can be cleaned as you stated using the CRC cleaner then they're not the Karman Vortex AFM, correct? Please confirm. Thanks
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#8
Intermediate
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#11
Racer
Wonder if this will help the issue I have where it wants to turn off after start up when hot. Doesn't do it when car is cold or outside temp is cold
The following users liked this post:
EthanS (08-03-20)
#13
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#14
Racer
#15
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Thread Starter