Pontiac Repair: 2004 GRAND AM WONT START

Question
QUESTION: NEED HELP GOT A GRAND AM 3.4 REPLACED THE HEAD GASKET BLOWN BETWEEN CYLINDERS 3&5 INSTALLED NEW HEAD GASKET CAR CRANKS OVER BUT WONT START FIRST WAS A SECURITY ISSUE INSTALLED A 2200 RESISTOR ON THE YELLOW AND WHITE AND THE BLACK WIRE NOW THAT THAT WORKS TRIED TO START THE ENGINE STILL WILL NOT START. USING THE VERUS SCOPE CHECK THE DATA AND SHOWS THE CKP SIGNAL BUT NO CAM SENSOR SIGNAL REPLACED THE CAM SENSOR STILL CAR WILL NOT START. CHECKED THE FUEL PRESSURE WITH KEY ON OVER 54 PSI AT THE VALVE ON THE FUEL RACK. CHECKED FOR SPARK AT THE PLUGS HAVE GOOD SPARK INSTALLED NEW PLUGS AND WIRES STILL NO START WHAT ELSE COULD BE GOING ON IN THIS CAR.

ANSWER: Hi steve.

the CMP sensor may bot show activity untill the engine is running. every year is different. you have the security thing fixed? on your scan tool it doesn't show that theft is active does it? if so that will not allow the engine to start. you have fule pressure. you have spark. on other things your missing is compression and fuel into the engine. if you have a noid light you can unplug an injector and crank the engine over the light should blink menaing the engine computer is commanding the injetor on. last thing is compression. if you have no compression it will not start. if you swapped the push rods that will do it. the intake and exhaust push rods are different lengths. If you have them in the wrong spots the car will not start. just throwinjg that out there. only other thing I have seen happen with these engines is if they have an inter mix with coolant/engine oil the engine oil looses it's ability to lube and I have seen cam shafts break on these engines. the cam seizes in the cam bearings and then it snaps off the cam is hollow rare but I have seen it happen. you would have zero compression on a few cylinders and some bent valves because of it.


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QUESTION: The compression is good over 125psi in all cylinders push rods our correct. have the voltage from the cam sensor while cranking it over by hand tested all spark plug coils while cranking over each one spark over and over but still no spark

Answer
spark is pretty basic. it needs power and ground at module on the small 2 wire connector pink is power black is ground. the 3 wire connector is the crank sensor input. the yellow and purple wires are the crank sensor input. on an a/c voltage scale cerank the engine over and check the voltage out pit it should be over 200 MV I think. if you check resistance across the yellow/purple wires it should be between 800-1200 OHMs much more or much less you have a bad sensor or wiring. all the magic happens in the module if it see the voltage it needs it should produce spark on a 3 coils.