But what do you look for with the scope? - Saab 9-5 Bulletin Board - Saabnet.com
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But what do you look for with the scope?
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Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Wed, 12 Mar 2014 14:06:56 Share Post by Email
In Reply to: Re: Not proven but often accurate., saabsince 93b [Profile/Gallery] , Wed, 12 Mar 2014 13:46:42
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It's not like the air mass meter is an On/Off switch or a Go/No go scenario.

It is a slight deterioration of a non linear signal back to ECM that makes the fuel mixture lean out more and more as the AMM gets worse.

So you would have to have a perfect scope line of a full throttle acceleration from a good car of exact specs of the faulty car or have access to a dyno where you could have a static load on the car at a certain throttle opening and then take into account the air pressure and temperature of the day since those will alter the reading of that AMM signal as well.

So the Tech 2 air mass correction value is as good as it gets and what Bernie say is true too but the problem there is that a car owner that gets used to his or her car as the AMM goes down in health, may not even think about that the turbo boost is not as peppy as it used to be since it sneaks up on you so slowly.

We on the other hand that drive these cars, different cars, every day usually feels that in the seat of our pants when taking off and that lack of boost feel together with the dropping of air mass correction value and also a more or less amount of pinging from the engine when you accelerate down the street paint a pretty good picture of what's going on.

Anders

SWEDECAR

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