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Difficult to do with a common rail diesel without diagnostic equipment and some expertise.
The main problem is the electronics will not allow fuel injection to begin until from the start of cranking a minimum fuel rail pressure to be achieved in a certain time - so if nothing else is found; battery, starter, good cranking speed, blocked fuel filter, air leak in fuel line, etc., check electrical pulses are being sent to the injectors with noid lights. If there is a pulse the injectors should be removed for testing but if there is no pulse it would be better to call in a specialist to test the electronics and the high pressure pump.
Hi. I'm not clear about something. Did the car run after the shop by-passed the anti-theft, replaced wiring to CPS and camshaft? Why did you need to replace the ECM and CPS a second time? There isn't a fast answer for this issue. It may take days of diagnostics.I always recommend starting with checking "Fuel & Spark". A compression test is a great idea as well. Right everything down so your not guessing. An engine can crank and not start for many reasons. Which coil test did you perform? Did the coil have both power and a pulse (While Cranking)? Please write back with specific diagnostic information and questions. I will do my best to help. Good Luck.
When you say it is getting gas, is it getting fuel pressure to injectors or are injectors actually pulsing and spraying? If you put a test light across the two wires of an injector, you should have a pulse when cranking. If not, and you have no spark, it could be a crank sensor fault. Have you had the vehicle checked on a diagnostic machine to see if any faults are permanent? This would be my first place to start or else you could end up in a "precision guess-work" scenario which would be far from cheap on that calibre of vehicle.
When the problem is ongoing, if it cranks good, have a helper crank it while you check for spark at the plugs, if everything is hot, wear gloves. Check proper fuel pressure and fuel injector pulse.
I'm especially interested in the fuel injector pulse. If your losing rpm signal, there will be no fuel injector pulse.
How long since overall tune-up? Any applicable trouble codes? Your obd1 so checking trouble codes should be easy, as long as your mil lamp works. There may not be any codes, I don't know? I can only help with testing, you have to do the testing.
Fuel in the tank does not mean fuel in the injectors. Run a fuel pressure test to see how much fuel pressure there is. Also check the injector pulse with a noide test light. The injectors may not be getting a ground to fire because of a bad fuse.
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