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You should start with getting a Bentley manual. These mauals are the most comprehensive source for troubleshooting and repair information for the 900's. They cost $40 - $50 and are available from this site's sponsors and from most Saab dealers; you may also be able to find them on Ebay from time to time. This book will help you troubleshoot your problem. Best investment you'll ever make.
As far your problem- '88 model year was a transition year from LH 2.2 to LH2.4 FI IIRC. The scrapyard AMM may not be interchangeable. You can determine this by simply looking at the part number. LH 2.2 will have 005 as the last 3 digits of the part number (has aluminum body), and LH 2.4 will have 013 as the last 3 digits of the part number (has an all plastic body). The two types cannot be interchanged. Moreover, if you have introduced an incompatible AMM into the system, I don't know what damage if any might be caused. Hopefully none. I can tell you that I have never seen nor experienced a no-start condition from a bad AMM. You might be jumping the gun in assuming that your's is defective; you might just need to replace your fuel filter or fuel pump based on the symptoms you've described.
In any event, I'm not going to type in the troubleshooting section of the Bentley manual here. Not from a lack of willingness, but I (or anyone else in this forum) would need more information after some basic tests have been completed.
As a source for reference, a reliable source for rebuilt AMM's is Injection Labs in Gardnerville, Nevada. Their phone is (702) 782-8544. I have used their rebuilt units before with no problems whatsoever. Good luck!!!
posted by 24.91.16...
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