Crank, no spark, no fuel

[Timothy McManus]

I have an early 1993 RT/10, was running great until I went out to the car one day and it just cranks, but never fires over. I checked all of the fuses in the passenger footwell, they were all good. No smell of gas out of the exhaust after cranking. I put a spark tester inline with a few of the spark plugs and I’m not getting any spark while cranking. I can hear the fuel pump running for 2 seconds when I turn the key to run so I am assuming there is good fuel pressure. I have a fuel pressure gauge, but don’t see a shrader valve anywhere to measure it. When I check the engine codes I get:

12 Direct battery input to PCM was disconnected within the last 50 key-on cycles (normal)

33 A/C clutch relay circuit

55 End of error messages

Code 33 has always been there, but idk if it could have anything to do with this new issue.


My thoughts are a crankshaft position sensor, camshaft position sensor or ignition module or something else that I’m unaware of. Does anyone know a way to narrow down the problem?

 

[Viper Specialty]

Crank engine. Listen for fuel pump run-on for a second after engine stops rotating. If you are getting FP activation, unlikely to be crank sensor issue, more likely Cam sensor. Otherwise, no FP activation when cranking often = bad crank position sensor.

 

[Timothy McManus]

I put my hand on the fuel pump relay and could feel it kick on and prime for 2 seconds when the key was turned to Run. Cranked the engine over for about 5 seconds and felt the fuel pump relay turn on for maybe ½ a second. Cranked the engine a second time and did not feel the fuel pump relay turn on at all. I have a new crankshaft position sensor on the way and will update once I get it switched out.

Thanks Viper Specialty for the helpful insight