Airflow Mass Meter

[Mr. Teal]

I tried a meter from another car and the warning light went off and engine sound awsome. So it appears it was faulty. Can it be fixed easily?

[Matt88S]

Very. You'll need a screwdriver.

Take screwdriver, unfasten the intake ductwork from the AMM. Disconnect the AMM connector, and connect it to the replacement AMM. Now reconnect the intake ductwork to the replacement AMM.

You're all done, was that easy or what?

[Matthew]

Originally Posted by Mr. Teal

Can it be fixed easily?

Do you want to fix the AMM itself?

[AUSSIE900]

You're all done, was that easy or what?

Boy .. I am amazed Matt , I had no idea you could fix these ! Endless talent ..

What should he do with the old one tho ? Paper weight ?

[Mr. Teal]

I know how to take it off and put it back on again. What i want to know is: What can go wrong with the part and how can that be fixed?

[Albert Trout]

If it's broken it's broken. No DIY fix for them. Just got to bite the bullet and get a new one.

[Mr.Wallace]

Originally Posted by Mr. Teal

What can go wrong with the part and how can that be fixed?

Everything can be fixed, oil and dust can cover the hot and cold wires, you can take it apart and blast it with brake cleaner, check the continuity and resistance of your thermistor, it should be around 8K Ω ohms at room temperature, if its higher than say 10K Ω replace it, it will cost you 20p

[Matt88S]

Originally Posted by AUSSIE900

You're all done, was that easy or what?

Boy .. I am amazed Matt , I had no idea you could fix these ! Endless talent ..

What should he do with the old one tho ? Paper weight ?

Just a little good natured humor.

Originally Posted by Mr.Wallace

Everything can be fixed, oil and dust can cover the hot and cold wires, you can take it apart and blast it with brake cleaner, check the continuity and resistance of your thermistor, it should be around 8K Ω ohms at room temperature, if its higher than say 10K Ω replace it, it will cost you 20p

I have much the same attitude, but I took one for my 88 900S apart, and inside, mounted in a gelatin like gell were wires that appeared to be as fine as a human hair. I put it back together and moved on because my sodering skills are not quite up to that level.

They are rebuildable, you can buy rebuilt ones so they have to be, but I'm betting its not something you can DIY easily. I want to say you can send them to Bosch to be rebuilt like you can do with the ECU's, but I don't know where you send them anymore, and even if you did, it would probably cost almost as much to do that as it would to buy a $150 rebuilt one from eeuroparts or the like.

[Albert Trout]

Originally Posted by Mr.Wallace

Everything can be fixed, oil and dust can cover the hot and cold wires, you can take it apart and blast it with brake cleaner, check the continuity and resistance of your thermistor, it should be around 8K Ω ohms at room temperature, if its higher than say 10K Ω replace it, it will cost you 20p

So that's the only thing that goes wrong with them?

[Mr.Wallace]

Originally Posted by Albert Trout

So that's the only thing that goes wrong with them?

Why would you ask if only one thing can break down in a system component that has over 50 parts? the most weather exposed parts should fail first.

[Albert Trout]

I may have taken it the wrong way but you implied fixing an AMM was a DIY-able job. How would go about troubleshooting and fixing the other 50 parts? I'm interested as I had an AMM fail and was told by my Saab mechanic to get a replacement one. Also, how do oil and dust get into the AMM when it sits at the back of the air filter?

[Mr.Wallace]

Originally Posted by Albert Trout

I had an AMM fail and was told by my Saab mechanic to get a replacement one. Also, how do oil and dust get into the AMM when it sits at the back of the air filter?

Mechanics are not electronic engineers or circuit designers, air filters do not remove smaller particals then the mesh will allow, exhaust fumes are not filtered out by air filters.

[TheRedBaron]

There are generic AMM rebuilding places that will rebuild any AMM/MAF/etc

[AUSSIE900]

Red is spot on , there are generic places that specialise in re man'ing AMM's Ecu's Ignition modules etc .

***Mechanics are not electronic engineers or circuit designers, air filters do not remove smaller particals then the mesh will allow, exhaust fumes are not filtered out by air filters.***

And neither are 99.99% of the people who read this forum looking for sound DIY instructions .

I think the point Alfred is making is very valid , its beyond the realm of DIY ,
HOW do you diagnose without expensive test equipment ?
To the original poster

I think there are 3 options on replacement .

Punt on a U pull it $20 special ...

Get a Remanned unit Europarts or similar

Or ask an *expert* to quote on the repair of your unit .

OR 4 u r the one in a thousand who is .. an electonics engineer
Nah delete that .. You would not have asked the question !

[Albert Trout]

I was young and inexperienced when it failed and paid £130 for a rebuilt unit