2weeks ago, I noticed a loss of power from the engine (AC was not turned on - rarely use it!). This was followed with the engine warning light coming on and the engine going ito safe mode. Took it to a Saab specialist. Diagnostic showed a faulty air mass conponent. This was replaced. However, this has not fixed the problem. Engine warning light comes on then goes off radomly. The engine also sound very rough!! The turbo lag (which was never great) is very bad!! any suggestions?
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That is pretty much normal. When the AC engages it's compressor it triggers the idle sensor to increase idle to compensate for the huge load that an AC unit puts on a vehicle. If your AC is producing cold air, approx. 40 degrees on high, then it should be ok. Power loss is all part of the program with AC. It takes much more noticeable power to run an AC unit on a vehicle, and especially a 4 cylinder. Ever see your house lights dim a bit when you turn on the Home AC central air? :.) Every item under your hood connected to your engine steals power from the engine. The AC is the king of all takers of power.
Does this occur when turning on AC while at speed ? If so, possible electrical problem. Get help soon....risky chance... if AC is turned on inadvertently while driving (maybe by a child or your passenger) and you don't notice it.....that loss of power could be disastrous.
I am not a mechanic but i have got the same model saab which i have had for 5 years. Same issue a couple of years ago, for me it turned out to be a hole in the hose to the intercooler. Loss of power and smoking. Once repaired all ok though
Check all battery terminals and 12v power feed connections are clean and tight.
Check all battery chassis and ground connections are also firm and in good order.
Check any in line 'Maxi' fuse connections are firm.
Check for water ingress in any cable loom or bulkhead connector exposed to the water spray.
coolant is what makes the car keep cool. it wouldnt keep it from running. sounds like a gas problem. check the fuel pressure and check all the fuel compartments. take it to a mechanic.. not Saab. they will do it for cheap maybe nothing.