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Do you get one spark or a bunch?
I keep an extra plug in the cars so that I can check for spark - It need not be a plug for your car, just set the gap properly.
Have you pulled codes and done the testing if you have the little test box in your engine compartment? My car passed all tests and had no codes when it would not start.
If your timing belt has skipped a tooth or two - or if teeth are missing - the cam will turn, but not act properly. How old is your timing belt? Most people have never seen their timing belt - you may be amazed at how small and fragile it looks!
When I had a problem with our '90 744TI, all I got was one spark. Turned out that the computer was gone. The junk yard that with over 700 Volvos - had 150 computers for NA 740s, but NONE for turbos - they could not find one on their network either.
Another timeI had a ground problem for the ignition - my car stalled when the high beams were turned on - its in the FAQ! When I cleaned all the grounds in the left front fender (there was one at the base of the anti-lock frame) I checked the battery connections - the main wire and the small wires on the positive post were badly corroded - I cut some crud off and soldered them to the post connector.
Good luck and hope it is not the computer.
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