Have 1997 Saab 900SE 2.0 turbo 4cyl. 5speed,my problem is car will turn over but wont start have replaced fuel pump ,fuel filter . motor will run while spraying starting fluid into the fuel body intake have checked all relays and all fuses . can you help

Look for a fuel reset. Not quite enough info on what is happening but I am going to take a leap of faith and assume it is turning over but not getting gas. Look in your manual for where the fuel reset is. Usually behind a foot panel in the front passenger side.

Easy way to verify this is to check the fuel pressure.

sounds like you have your fuel lines backwards or an electrical issue

Since it does eventually start and run, hard starting is usually a fuel delivery problem (pressure regulator, fuel filter, fuel pump, kinked fuel line). First check the fuel pressure after turning the key on but not starting the car.

I would check for fuel pressure first. If the fuel pump is out, it will not throw a code to the computer.

Replace oil press sending unit

water temp switch faulty.

In order of failure rate you should check:
1) DIC (the red module sitting between the cam banks). This may or may not throw a code (random misfire or a specific cylinder misfire). The easiest way to check this is to simply swap in a known good DIC and see if this fixes the problem. You should also check your plugs at this point and ensure that they are gapped no larger than 1 mm, as overgapped plugs are the primary cause of DIC filures..
2) CPS (crankshaft position sensor) located on the right front lower corner of the engine block. This should throw a code, but may not. I do not have access currently to the electrical specs you should be able to read with a multimeter;
3) Fuel pump and fuel pump relay. To check this, remove the IAT sensor in the throttle body transition casting and spray starter fluid into the throttle body. Replace the sensor finger tight and crank the car. If it starts and runs until the starter fluid is gone, you probably have a pump or relay issue. Raise the rear seat and hammer on the top of the tank next to the fuel pump assembly with a large rubber mallet and then try to start the car. If it starts and runs, your pump is probably failing. Check the relay under the dash regardless to ensure that it is working. You should be able to hear the pump run when you turn the key to the on position, especially with the rear seat up.
Good luck.

did it crank? first check your battery,spark,and fuel..also if check engine light shows up rent a scanner to read the code by then you a idea what causing it before do any further...

on those cars the engine is mownted in top of the transmision and use the same oil for lube and cooling please ck oil level on the engine