Help needed for '97 RAV4 part identification [MAP sensor] - Toyota RAV4 Forums
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#1 (permalink) Old 12-23-2009, 07:25 PM
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Help needed for '97 RAV4 part identification [MAP sensor]

Hi,

I need to identify a part located near the engine. Someone told me I should replace it to reduce pollution.

Can anybody help? What is it exactly? Does a replacement of such part could help in reducing pollution?

It's for an '96 automatic petrol rav4.

Thanks.

[img]/forums/album_pic.php?pic_id=10175[/img]

[img]/forums/album_pic.php?pic_id=10176[/img]
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#2 (permalink) Old 12-23-2009, 08:16 PM
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I believe that is the MAP sensor, but I am not sure.

Kurt

Bored throttle body, Ram Air Intake, 2.5" dia. exhaust, DynoMax muffler, Thrush resonator, 9005 low beams... + more
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#3 (permalink) Old 12-24-2009, 12:43 AM
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It sure looks like the MAP sensor

Toyota # 89420-42010 correct?

I have never heard of replacing the MAP sensor to reduce pollution before...
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#4 (permalink) Old 12-24-2009, 04:25 AM
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You guys are correct, it IS the MAP.
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#5 (permalink) Old 12-24-2009, 06:08 AM
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Thank you for the information.

What is the purpose of such sensor?
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#6 (permalink) Old 12-24-2009, 07:12 AM
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The sensor measures the changes in pressure (MAP=Mass Air Pressure) in the intake manifold and adjusts the amount of fuel injected accordingly

High pressure = low vacuum = WIde Open throttle
Low pressure = high vacuum = Closed throttle
Throttle plate partially open + high vacuum = engine under load
etc

It is essential for adjusting the fuel mixture and timing

Kurt

Bored throttle body, Ram Air Intake, 2.5" dia. exhaust, DynoMax muffler, Thrush resonator, 9005 low beams... + more
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#7 (permalink) Old 12-24-2009, 09:44 AM
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So, in case of possible malfunction, it may fix pollution problems with better fuel mixture adjustment.
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#8 (permalink) Old 12-24-2009, 07:28 PM
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Quote:
Originally Posted by flex
So, in case of possible malfunction, it may fix pollution problems with better fuel mixture adjustment.
If its not working right your Rav will run very poorly or not at all.

Did you fail an emissions test recently?
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#9 (permalink) Old 12-25-2009, 03:02 PM
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Well, the emission test didn't failed but is really poor.

We tried to disconnect the sensor few seconds during the test and emission went better... I think It may add too many fuel in the mixture adjustment.

The guy at the emission test told me he has already seen that before with another kind of car and the replacement of such sensor had resolved the problem.

The car has been checked by Toyota very recently for some parts replacement and engine check (among other little things). They didn't find unusual things.
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#10 (permalink) Old 12-25-2009, 05:15 PM
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How many Km do you have?

Before jumping into changing the MAP sensor or other sensors, when was the last tune up done?
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