It was the Mass Air Sensor [MAS]!
07-06-2003, 07:03 PM
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It was the Mass Air Sensor [MAS]!
<center><img src="http://www.unicomsystems.co.uk/Images01/CHTS4_1a.jpg"></center><p>
Since buying my S4 I've suffered with (1) cold start idle problems, (2) significant RPM drop when the Air Con was turned on ... and (3) a slight hesitation at WOT.
Numerous suggestions and 'helpful tips' from here and elsewhere failed to cure the problem.
In desperation I ran some checks on the MAS today .... it fell at every fence!
So, I went out and brought a new one and WOW what a difference ..... I love these cars.<ul><li><a href="http://www.unicomsystems.co.uk">http://www.unicomsystems.co.uk</a</li></ul>
Since buying my S4 I've suffered with (1) cold start idle problems, (2) significant RPM drop when the Air Con was turned on ... and (3) a slight hesitation at WOT.
Numerous suggestions and 'helpful tips' from here and elsewhere failed to cure the problem.
In desperation I ran some checks on the MAS today .... it fell at every fence!
So, I went out and brought a new one and WOW what a difference ..... I love these cars.<ul><li><a href="http://www.unicomsystems.co.uk">http://www.unicomsystems.co.uk</a</li></ul>
07-07-2003, 03:47 PM
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See "S4 Rebuild" on my website ....... details inside .....
<center><img src="http://www.unicomsystems.co.uk/Images01/Image1zx.jpg"></center><p>Select "ECU Management Sensors" within the S4 Rebuild pages of my website. I documented and photographed what I did.<ul><li><a href="http://www.unicomsystems.co.uk">http://www.unicomsystems.co.uk</a</li></ul>
07-07-2003, 05:09 PM
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Unconvinced by the K&N oil reports ....
Despite what we might read on the likes of AW, from new [and forever thereafter if correctly re-oiled] there is no way that a hotwire, self-cleaning Bosch MAF can become contaminated by a K&N and its' oil. Bosch have been using that type of sensor in TD commercial vehicle applications utilising 'oil-bath' air cleaners for years. I've heard tales of everything from olive oil to old engine oil being used on the wire-mesh filter elements in less developed parts of the world! ....... "but each to his own" eh?
I've often used carburettor cleaner on MAF/MAS sensors. No problems ever encountered other than with some Ford units where the plastic body melts!
I've often used carburettor cleaner on MAF/MAS sensors. No problems ever encountered other than with some Ford units where the plastic body melts!
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07-07-2003, 05:17 PM
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So I take it you just replaced it and didn't try to "clean" it..........
I'm suffering from what sounds like the same problem. I keep thowing the code 2413. My mileage stinks all of the sudden, it isn't starting like it did a few months ago (takes several cranks), the car's idle is super low when the AC is on and then jumps up to about 1400 for about 2 seconds, it has a total flat spot everytime I hit 3K rpms and in general just feels weak. I want my fun back!! 8^(