Question about 1995 Saab 900
My wife has a 95 900s and we`ve had it for a few years now and can`t find a mechanic who can find a problem. the problem is when at idle on occassion the car will rev so hard it sounds like it`s going to explode then all of a sudden the rpm`s drop and the car stalls!
Try cleaning out your throttle body with some throttle body cleaner. good luck
Posted on Feb 19, 2009
Check if your idle control valve is working. if it is stuck open randomly it will definetly have the symptoms you describe. this valve controls idle by allowing air to bypass the throttle body the more open the valve the higher th idle. other sensors such as coolant temp sensor, throttle position sensor and air flow sensors all play a part in sending the computer info so the computer can send a signal to the idle control valve. so check all sensors and connections. hope this helps. p.s. the idle control valve is right next to the throttle body/cable
Posted on Aug 14, 2008
There is a recall on the engine computer for this problem
Posted on Aug 09, 2008
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Posted on Jan 02, 2017
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following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
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