Help needed for '97 RAV4 part identification [MAP sensor]

[flex]

Originally Posted by calgaryrav4

It sure looks like the MAP sensor

Toyota # 89420-42010 correct?

I have never heard of replacing the MAP sensor to reduce pollution before...

Well it seems it's not the exact name, but the identification part number is good (thanks to the toyodiy.com website I've just discovered)

toyodiy.com #89420 part

[jthomas43613]

Originally Posted by 2001SL2

The sensor measures the changes in pressure (MAP=Mass Air Pressure) in the intake manifold and adjusts the amount of fuel injected accordingly

sorry but you are wrong, MAP= Manifold Absolute Pressure

[calgaryrav4]

Originally Posted by flex

Well it seems it's not the exact name, but the identification part number is good (thanks to the toyodiy.com website I've just discovered)

Yeah I think toyota calls it a vacuum sensor or something like that...

I the non toyota world it is called a MAP (manifold absolute pressure). If you call it a vacuum sensor most people will not have a clue what your talking about.

How many Km's do you have?

When was the last tune-up?
-spark plugs
- cap and rotor
- wires
- air filter
- fuel filter (not so much for emissions more for performance)
- timing checked/addjusted (since you have a dizzy)

When was the last time the oxygen sensor changed? (can cause poor emissions if worn out, and yes they do wear out over time)

I would start with the basics first.

Honestly, I don't know if I would trust that mechanic. It sounds like hes out to make a quick buck off you.

[flex]

Well, it's my father-in-law who took care of the car until i bought it to him last week.

Check was done last month. I didn't have picked invoices up yet from him so I don't know the full history but I'm at least sure about filters, oil service, timing belt, water pump and spark plugs for the last tune up.

The rav4 has around 180000 kms.

The MAP sensor replacement advice doesn't come from a mechanic (well in fact he was, right before its current job), I know him very well and he's now in charge of a several technical inspection centers (every two years in france for cars that are at least 4 years old). In France, Car repair shops and technical inspection centers are two seperate things to avoid conflicts of interest.

During low speed emission test, he disconnected the MAP sensor, and emissons had reduced dramatically to more than a standard level.
May it be significant?

Beside this emission problem, the engine seems to work perfectly at low speed, and high speed, and I haven't encountered any acceleration problems.

I'll check the history of the vehicle, as soon as I get all the invoices.

[2001SL2]

Originally Posted by jthomas43613

sorry but you are wrong, MAP= Manifold Absolute Pressure

Correct. Sorry

[brett gazdzinski]

I would suspect the map sensor disconnect just masked another problem.
If it was bad, i think the rav would run poorly.
Try driving with it disconnected, it will likely run very poorly.

plugs, wires, oxy sensors, I would suspect other things before the map sensor.

Brett

[flex]

when you say plugs and wires, this is the ones for the spark plugs?

[2001SL2]

Originally Posted by flex

when you say plugs and wires, this is the ones for the spark plugs?

Yes, spark plug wires. OEM toyota are good quality

[flex]

Just another though, what about the Exhaust Gaz Recirculation system? It has caused so many problem on some engines...

Is EGR available only on diesel engine?

[2001SL2]

EGR is on gas engines also. THe valve is right next to the throttle body, on the back of the intake manifold.

YOu can actually reach under the top and move the valve with your fingers to see if its sticking.

If you run the engine and manually open the valve then the engine should try to stall. If it doesn't, the valve may be clogged