I know there are a ton of these "crank, no start" posts but can't seem to find one with my exact symptoms. I bought this jeep off a guy who owned it for years, and he had went to start it one day and it would just crank and not start. He replaced the camshaft and crankshaft sensors about a year ago, so then he tried replacing them again, but still not starting. He had also replaced the PCM a while ago, not sure how long ago. I bought it this way and my first idea was to check fuel.
After spraying a little starting fluid down the throttle body, it sputtered but did not fire up. I did not hear the fuel pump running when key was on so I checked out the relays. I am getting power to both the common side and the coil side of the fuel pump and ASD relays. The fuel pump will run with a jumper in the relay, but not with a relay plugged in (and yes I did try a new relay). Even with the fuel pump and ASD relays jumped, it will only sputter and will not run. It did seem to kind of "pop" when it sputtered. So this made me think timing?
With the relay plugged in, I can feel the relay click when key is turned on, but it turns right back off, like the computer is telling it to turn off and I do not hear fuel pump run at all. The only code I have is P1495, which I tried clearing and it came back. Could the brand new camshaft or crankshaft sensors be bad and not throw a code and this causing fuel pump to not run? I know the aftermarket sensors don't have a great reputation, and I can't seem to find a place that sells the Mopar sensors anymore. I plan to check the power at both crank and cam sensors, and continuity between the sensors and PCM tonight, but it just seems odd that the fuel pump won't run unless maybe the PCM is bad.
After spraying a little starting fluid down the throttle body, it sputtered but did not fire up. I did not hear the fuel pump running when key was on so I checked out the relays. I am getting power to both the common side and the coil side of the fuel pump and ASD relays. The fuel pump will run with a jumper in the relay, but not with a relay plugged in (and yes I did try a new relay). Even with the fuel pump and ASD relays jumped, it will only sputter and will not run. It did seem to kind of "pop" when it sputtered. So this made me think timing?
With the relay plugged in, I can feel the relay click when key is turned on, but it turns right back off, like the computer is telling it to turn off and I do not hear fuel pump run at all. The only code I have is P1495, which I tried clearing and it came back. Could the brand new camshaft or crankshaft sensors be bad and not throw a code and this causing fuel pump to not run? I know the aftermarket sensors don't have a great reputation, and I can't seem to find a place that sells the Mopar sensors anymore. I plan to check the power at both crank and cam sensors, and continuity between the sensors and PCM tonight, but it just seems odd that the fuel pump won't run unless maybe the PCM is bad.