Will Cleaning The Mass Air Flow Sensor Increase Mpg

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Aug 3, 2014

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Vehicle:

2007 Prius

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II

How-do-you-do. I drive a 2007 Prius with 75000mi. So dealership pointed out my throttle body was dirty and needed cleaning so I decided to do it myself. Before I cleaned the throttle trunk with CRC Throttle Body Cleaner and the MAF sensor with CRC MAF Cleaner, my avg mpg was ~48mpg on each tank. I read cleaning throttle body and MAF sensor will improve mpg past about 3-5mpg, but this was not the example. After I cleaned these two components, I am now averaging about 40mpg on the exact aforementioned conditions I've been driving under. In addition, my Ice remains running for a significantly longer fourth dimension at finish lights before shutting off than before cleaning (shuts off after ~30sec-1min later on coming to consummate stop). Also, when I am going downhill now, I get about 75mpg because the ICE is also all the same running even with my feet off the acceleration pedal, whereas earlier it was displaying 99.9mpg on the aforementioned hill. I was thinking maybe something incorrect with the throttle body now? Whatsoever explanations or aid would exist great. Thanks!
What did the dealer exercise to your auto?
You won't get whatever better mileage past cleaning the throttle body and I have never seen that mentioned here.

Accept the air cleaner box off and check all the hoses are continued. Take the big hose off the back of the tb and spray the cleaner through that port. That's the 1 that gets dirty as the big hose is the pvc hose. Cheque for free play with the butterfly by turning the springed cease. Lubricate the springed cease. I know the maf is plugged in because if it wasn't information technology would throw an instant dtc.

Then when you put the air box assy back on make sure the throat clench underneath the air box is tight likewise.
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The dealer didnt clean information technology. I did. I followed pace past footstep instructions from diy prius to clean the TB and MAF sensor. I didnt take anything apart except remove the MAF sensor.
The dealer didn't do anything- he decided to do the job himself..
... day belatedly and a dollar brusk..
1. Delight explain your exact procedure used to clean the throttle body and mass air flow sensor.
2. In full general, less is more when doing these cleaning procedures. This means you lot do non need to utilize 1/2 can of throttle body cleaning fluid and drown the intake manifold in cleaning liquid, to attain a good result. The Toyota recommended procedure is to spray some cleaning fluid on a clean material and apply that to scrub dirt off the throttle body interior and throttle plate, rotating the throttle plate shaft to gain access to the underside of the throttle plate. This avoids having dirty cleaning fluid laden with dirt getting into the throttle body motor shaft and bounden the motor. Obviously the air cleaner housing has to exist removed for access.
3. The mass air flow sensor is cleaned by removing it from the air cleaner housing, and spraying the sensor seedling and bare wires with MAF cleaner. Practice not touch whatever of those cleaned parts and brand sure you have a good seal when reinstalling the sensor in the air cleaner housing.
four. Information technology is not reasonable to expect improved mpg by performing those cleaning procedures.
v. The point of doing the throttle trunk cleaning procedure is to avert engine no-beginning issues (DTC P3191 for example) which tin happen if the throttle plate binds up.
6. The bespeak of doing the MAF sensor cleaning is to improve the engine ECU's ability to manage fuel delivery to the engine, and avoid a DTC being logged (such as DTC P0171, P0172, or one of the P010x codes.) That might upshot in a marginal mpg comeback but that should not exist the primary motivator backside that cleaning activity.
7. Brand certain the wiring harness connector to the MAF sensor is properly engaged and locked.
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Morton, IL

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I followed this guide exactly:
Toyota Prius: How to Clean the Throttle Trunk - PriusDIY.com

Except instead of using a store towel, I used regular paper towels and I recall a very small bit of information technology (the size of a ladybug) ripped off during cleaning. I didnt think this would be a big consequence since information technology would but burn off in the engine and disintegrate.

On the cleaner bottles, it said spray liberally, so I used it pretty liberally and I could see fluid sitting at the bottom of the throttle body. As for the MAF sensor, I didnt touch any part of the seedling or wires, only sprayed it with MAF sensor cleaning fluid quite liberally as well.
1. It is non helpful for whatever debris to be immune into the intake manifold. The concern is that the paper may stick to the edge of a valve, carbonize, and prevent the valve from sealing properly.
2. What did the MAF sensor seedling and wires look similar, later they were cleaned?
3. At this point, if your car is non logging any alert lights, you lot should just drive it and perhaps the mpg will improve over time.
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The MAF sensor was a shiny, glossy bister later it was cleaned. The ii wires were a shiny metallic silver. No warning lights were on and it runs fine, its just annoying to know my Prius isnt equally tranquillity equally it was before similar a normal hybrid vehicle and im getting lower mpgs :[
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I feel another guess coming on. The additional cleaning fluid in the bottom of the intake manifold has dissolved the oily residue that collects there and when ingested into the engine has temporarily fouled the plugs. It is more likely that the 12V battery has decided to give upwardly the ghost in conjunction with this procedure. Working on your car with the windows downwardly and your favorite radio station playing for 30 minutes or more than (guessing here) might have been all it took. Excessive engine run times and a respective drib in mpg are a proficient indicator of a weak 12V auxiliary battery. Run this check and if the 2nd voltage value is much below 12.0V y'all probably need a new battery.
A reasonable hypothesis, and the OP can prove or disprove this by removing the iridium spark plugs for inspection.
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Deceit be the 12v bombardment since that was replaced 3 weeks agone with an Optima Yellow Peak. I will try to remove the plugs when I get a chance and see if those can be replaced.
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Information technology seems the more I drive, the Water ice is turning off quicker and quicker at stops, although it's nonetheless long compared to earlier cleaning the TB and MAF. Maybe I'll just drive information technology out and the problem will set itself in the long run if no i has an immediate easy fix to the outcome.
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2007 Prius

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I am reporting the exact same experience; I cleaned the MAF and TB yesterday using the CRC spray cans (MAF cleaner for MAF and TB cleaner for TB) and my Prius (2007 with 91K) doesn't plough ICE off every bit quickly equally before. I didn't use paper to make clean, I used a clean textile to make clean the TB. I did liberally spray the TB cleaner on the butterfly and underneath; no, I did not spray more than 5 or 6 times.
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Ecu only needs to learn characteristics of changed throttle body. If information technology was muddied enough it may not even close downwards engine at first. It learns it bit faster if you disconnect 12v bombardment for 10min to reset ecu. Or you lot tin just bulldoze it and it volition eventually learn it.
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2007 Prius

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I re-checked and re-tightened all the screws that I had removed/loosened for the job, plant 1 spiral that was loose, oops. Now, my Prius is back to normal. Cheers!
Stone
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What about the not related MPG decrease as winter approaches? OP doesn't have a location listed.