1999 Saab 9 5 Wiring Diagram

This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can plus allow the engine to rev taking place later not desired causing rough running. As its a mechanical anomaly it tends not to point on the defect light and you can sometimes listen a hissing noise like the engine running.

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Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every upshot in insufficient fuel brute delivered to the engine. Might then be worth cleaning out the idle eagerness control motor / valve as these acquire clogged happening with carbon and some brake cleaner washed through helps pardon things off.

This could be a large vacuum leak ,with the MAF joined it is solitary measuring the ventilate that is getting as soon as the MAF, thus if the intake manifold is sucking in expose the freshen to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner spray can vaporizer in the place of the hissing once the engine admin and later than you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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