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My 1993 pontiac grand am will crank but not turn over

Will a bad ignition cause this also there is no pulse to the injectors. How would I check the harness to the computer.

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Unfortunately this is not the 1960 or 70's. Back then you could look at pretty much any car with this problem and quickly determine if the problem was on the ignition side or the fuel delivery side. And if on the ignition side it was almost always the points, and you could very quickly re-gap them or replace them if needed.

Modern cars however have very complex computerized engine management systems. So now, if any one of a dozen sensors is giving faulty data or no data to the ECU it might keep your car from starting. On the plus side however the cars brain also diagnoses most problems for you. So anytime you have an engine problem with a modern car the first thing you do is see if the engine check light is on and if so you hook up a code reader and get all the current error codes, if any. The problem could be anything from a crank angle sensor (well, not on your car) to MAF sensor and there is no point guessing until you check for codes. Your car is pre ODB2 of course but if you use a wire to connect the A and B terminals on the test port you should be able to get the ECU to flash out the codes for you (long and short dashes). Then just look them up online.

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1 Answer

No injector pulse

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No injector pulse at injectors:
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b) use scan tool to read RPM at PCM while cranking. Ask question specifying RPM PID data.
c) crank sensor/cam sensor/ign. module/wiring fault
d) stuff not plugged in properly
4) check fuses
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