Joined
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139 Posts
I'm so stoked! This post is for you 10-13 MPG folks out there.
I finally found my mileage black hole! After throwing a few hundred bucks in the way of a new VAFM and TPS, water temp sensor, 02 sensor, as well as a thorough off-the-vehicle injector cleaning and all imaginable checks for vacuum leaks etc...
Turns out if your EGR vacuum modulator is bad, it won't necessarily throw a code! I did the FSM "blow test", by pulling the three tubes off Q, P and R, then plugging P and R with my finger while blowing into Q. Air did not flow that freely, even after cleaning the filter under the cap. There are websites out there that say if you can blow air through the big pipe on the bottom, then its bad. Some folks have the diaphram blow out from heat and exhaust pressure, and it gets caked with soot. After I broke mine open, it was dirty but not obviously broken. I tried spraying cleaner through the ports, but I was not satisfied with it.
I ended up getting a new one (Toyota part# 25870-65010) for my 3VZE 3.slow off ebay for $40 shipped, and I topped off and test drove the freeway. I was not light footed, went 70-80 miles per hour and worked the AC part of the time. Even jumped the start a few times. Went about 51 miles. Topped off again exactly the same way.
Long story short, my mileage shot up from 14.71 MPG to 18.76! That's a 27.5% increase. When gas was $4, that's over a buck a gallon sucked out of my pocket!
(If somebody needs a good VAFM, I have a slightly used one for cheap, with only 45K miles on it.)
I finally found my mileage black hole! After throwing a few hundred bucks in the way of a new VAFM and TPS, water temp sensor, 02 sensor, as well as a thorough off-the-vehicle injector cleaning and all imaginable checks for vacuum leaks etc...
Turns out if your EGR vacuum modulator is bad, it won't necessarily throw a code! I did the FSM "blow test", by pulling the three tubes off Q, P and R, then plugging P and R with my finger while blowing into Q. Air did not flow that freely, even after cleaning the filter under the cap. There are websites out there that say if you can blow air through the big pipe on the bottom, then its bad. Some folks have the diaphram blow out from heat and exhaust pressure, and it gets caked with soot. After I broke mine open, it was dirty but not obviously broken. I tried spraying cleaner through the ports, but I was not satisfied with it.
I ended up getting a new one (Toyota part# 25870-65010) for my 3VZE 3.slow off ebay for $40 shipped, and I topped off and test drove the freeway. I was not light footed, went 70-80 miles per hour and worked the AC part of the time. Even jumped the start a few times. Went about 51 miles. Topped off again exactly the same way.
Long story short, my mileage shot up from 14.71 MPG to 18.76! That's a 27.5% increase. When gas was $4, that's over a buck a gallon sucked out of my pocket!
(If somebody needs a good VAFM, I have a slightly used one for cheap, with only 45K miles on it.)
