Read More. The throttle body controls the air flow into the engine and the fuel injectors supply the proper amount of fuel to each piston depending upon operating conditions. If the engine stops, say in a traffic accident, the fuel pump is shut off to minimize the chance of high pressure fuel leaks and fire. All corporate trademarks are the property of their respective owners. OutdoorWire Websites. The air flow meter uses a flapper vane and temperature sensor to detect the amount and temperature of the incoming air flow. So you should go by the FSM wiring diagram for your specific vehicle for exact connections. In a stock engine compartment, this is in the driver's side front corner. The Toyota 22R-E engine is electronically fuel injected.
On the 22RE engine, the AFM is located atop the air filter box. so it probably ignores it and goes into some sort of safe but less than ideal operating mode.
22RE motors utilize a air fuel meter (AFM) system, as opposed to mass air flow or speed density, in order to regulate the air entering the motor.
The AFM is. Are there larger toyota motors that use AFM's like the 22re. Has this ever been tried?
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The AFM is not really designed to be adjusted, so it either works or doesn't work outside of some folks adjusting the tension of the internal spring to vary the AFM calibration. These modifications increase air flow and can cause a lean condition. And since the density of the air affects how far the AFM sensing vane is pushed open for a given volume of air passing through it, the ECU needs to know both the temperature and the volume or air in order to estimate the mass or weight of air or oxygen coming into the engine.
Tips and Tricks
Next use the razor blade to cut through the silicon around the black plastic lid on the AFM. This is an easy modification that only requires a razor blade and a Phillips screwdriver.
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|The T HA circuit is just a temperature sensitive resistor in series with a fixed resistor R inside the ECU and the ECU "sees" the voltage across T HA to ground and uses this to determine the temperature of the intake air, which affects its density.
It is now time to go test the modifications for any improvement in the fuel mixture. If the engine runs overly rich or lean, especially at full throttle, the AFM could be the cause, if its telling the ECU that extra air is present that isn'tthe ECU running on open loop mode at full throttle would increase the fuel injected into the cylinder, causing the rich condition.
Toyota Tech from 4x4Wire Read More. Too lean of a fuel mixture can result in detonation and holes burnt in pistons in extreme cases.
Minute Mod Adjusting the Air Flow Meter
Currently my 91 pickup with a 22re has the following done to the engine, Comp. Increasing the fuel mixture by doing this mod actually hurt the. Most people including Marlin suspected AFM and in a way thats dead on. This results in a richer mixture and often, improved power and throttle response. Here's OldMage's explanation of how to do this for the 22RE: The AFM mod.
If this happens, check the E1-Fc connection.
Toyota 22RE Air Flow Meter (AFM)
It is now time to go test the modifications for any improvement in the fuel mixture. Anybody Paid for a 3. In the image below, the AFM is dead center in the image:. So now that you know how the AFM is supposed to work, on to the actual device testing procedure If the engine runs overly rich or lean, especially at full throttle, the AFM could be the cause, if its telling the ECU that extra air is present that isn'tthe ECU running on open loop mode at full throttle would increase the fuel injected into the cylinder, causing the rich condition.
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|Start by locating the AFM, which is directly behind the air box.
Video: 22re afm mode 22RE Toyota AFM MAF sensor adjustment part 2.
Too rich of a mixture will result in poor fuel mileage, sluggishness at lower RPMs, and excessive exhaust emissions. Mitsubishi 4x4 Tech - Mods, Maintenance, Tech and more Name of 90's Montero parts catalog? Without the fuel pump running, the engine will cut out and die from lack of fuel.
Mitsubishi 4x4 Tech - Mods, Maintenance, Tech and more In a stock engine compartment, this is in the driver's side front corner.
Pull the 15 amp fuse under the dash for the electronic fuel injection EFI for several minutes in order to reset the ECU.
It should be possible to move the gear without completely removing the retaining clip. Copyright c OutdoorWire, Inc and MUIRNet Consulting - All Rights Reserved, no part of this publication may be reproduced in any form without express written permission You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
The AFM is not really designed to be adjusted, so it either works or doesn't work outside of some folks adjusting the tension of the internal spring to vary the AFM calibration.
22re afm mode
|If the pump were to keep running, it would likely be damaged in short order.
Video: 22re afm mode How to test air flow meter on a 1988 toyota pickup 22RE 2.4L
We suggest only adjusting the gear one tooth at a time until the correct mixture is achieved. Common modifications such as free flow air filters, camshafts, and exhaust headers can help give Toyota trucks more power to turn big, heavy tires. Name of 90's Montero parts catalog? All corporate trademarks are the property of their respective owners.
And to see why this is so, look at the Theory of Operation section above Recent Posts on TrailTalk.