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Does anyone know what the differences are between the many models of fuel ecu's? My 1990 Carlsson 2litre 9000 has a-547 fitted, all references I can find suggest this is off of an earlier 900,and that the correct one is probably a -587.The car runs fine although Very rich and seems to have no power so to speak of, I would estimate at most 140-150bhp.Boost peaks just in the red and does NOT decline noticeably with rpm rise. All hoses,valves etc good. It just has no go(compared to my Granada 24v with allegedly the same power)
 

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You could always ask your local parts person at a Saab dealer to check the part no: for you to see if it is the right ecu for your car, Can't suggest anything else
 
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