MAFs and more importantly where to get one from

[Ashmond]

should have bought mine mate would have been half the price!

[Dalo Harkin]

Sorry mate, didn't know you had one going

[Ashmond]

Yeah my bad thats why I changed my sig, no bother bro

[Dave_IOW]

Dealers wanted to test drive your car?

That seems pretty odd in itself...

[Dalo Harkin]

They requested I drive it with one of them in to show symptoms, I said I would be leaving the car with them and they said they would drive it then..... think they were just being tw@ts imho
It was after this I got 20 questions in terms of any aftermarket parts and blah blah

I did think to myself on more than one occasion it was them trying to squirm out of the warranty

[Wazzzer]

Ha there's no way I'd let a bunch of parts monkeys drive my car to "test" the symptoms. They wouldn't have been able to tell much from driving it anyway.

The outsides of the Bosch units are just that; outsides. The main sensor is the important bit. See if that has Bosch printed on it

[xxChrisxx]

Ha there's no way I'd let a bunch of parts monkeys drive my car to "test" the symptoms. They wouldn't have been able to tell much from driving it anyway.

On one hand people complain mechanics don't do a proper job by just plugging in a computer. Then there are complaints when they want to test drive the car, (infact they only wanted to sit in the car). A test drive as a valid part of a proper diagnostic test.

I did think to myself on more than one occasion it was them trying to squirm out of the warranty

Also, by having a mapped car you do invalidate the warranty. MAFs are designed to flow a certain amount of air, by requesting more boost you are flowing more air through that MAF than it was designed to take.

[hardmonkeys]

Surely to find any symptoms they need to drive it..right? That's what we had to do, when I was an apprentice at Proton back 2000, sure not much has changed. 

[Wazzzer]

MAFs are designed to flow a certain amount of air, by requesting more boost you are flowing more air through that MAF than it was designed to take.

Rubbish. The AGU MAF can happily flow around 180g/s of air which is enough to take you up to approx 220bhp.

[xxChrisxx]

MAFs are designed to flow a certain amount of air, by requesting more boost you are flowing more air through that MAF than it was designed to take.

Rubbish. The AGU MAF can happily flow around 180g/s of air which is enough to take you up to approx 220bhp.

Bosch sensors work on the hot wire/hot mesh, and have several calibration curves depending on the application. ie g/s flow per volt. Flowing more air past them than they expect to see causes them to go out of calibration. This is the reason they seem so unreliable on mapped cars.