I'm wondering if a rebuilt air flow meter would deliver any noticeable improvement in mileage on my over 325,000km 1993 ES300? Car has recent plugs, oxygen sensors, distributor/rotor, timing checked, and gets regular fuel injector cleaner put through it. A rebuilt Beck Arnely AFM would cost me under $200.00. I'm thinking this metering device is a main source of info for the computer to calibrate fuel/air mix, so a new one should benefit....or would it?

 

You can clean the maf sensor. No need to buy a new one.

 

The '93 has no MAF, it has an air flow meter. There is nothing to clean and they almost never fail or wear out. If they do go bad, generally the car will not idle properly or at all.

Don't waste your money.

 

I stand corrected.

 

I found this modification which seems to promise a small mpg improvement and HP increase when done along with a timing change (see post by Pheonix): https://www.clublexus.com/forums/es3...low-power.html Old post/thread. Has anyone done this and what were the results? I'm musing over getting the rebuilt AFM to have as backup in case I mess up the one on the car.

 

I've done the airflow meter mod it works very well. It smoothed out the engine slightly and also added some extra punch. I set the timing to 15 degrees as well.

 

I have a 2001 ES300. Is there a difference between an AIR FLOW METER and a MAF SENSOR or is it the same thing? I have code P0174 coming up? Your help is appreciated!

 

http://en.wikipedia.org/wiki/Mass_flow_sensor
You have the 2nd one.