Camshaft Position Sensor

[Logan Savage]

Can the camshaft position sensor cause only one injector not to fire ?

 

[teeje]

No. The camshaft position sensor only pays attention the the camshaft position. Hence the term camshaft position sensor. It's possible for injectors to short over time. Try hooking up a multimeter and see what the resistance is on a known good one and check the bad one


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[Logan Savage]

According to what I read the camshaft position sensor sends a signal to the PCM at the appropriate time for the PCM to send a signal to the appropriate injector & that injector fires . If that is correct , if for some reason the camshaft position sensor skips sending a signal for # 4 injector then # 4 injector wouldn't fire .
I'm kind of grasping at straws , I have verified power to one of the injector wires , I have verified continuity of the other injector wire to the PCM . There is power to the injector all the time & the PCM is supposed to provide a pulsing ground to the injector to fire it . The PCM requires a signal from the camshaft position sensor before it provides the ground . At least that's the way I understand it .
I know the injector is good , I know the power wire is providing power to the injector & I know the ground wire from the injector to the PCM is good . The PCM is not providing the ground so either the PCM isn't getting a signal from the camshaft position sensor or the PCM itself is bad . I'm trying to eliminate the possibility that the camshaft position sensor could be the culprit before I condemn the PCM .

 

[uss2defiant]

the cps is not that expensive to replace. I think it's only a $20-$30 dollar MOPAR part if memory serves me correctly.

 

[kage860]

I'm assuming you have a missfire in cylinder #4.
Have you tried to swap the coil / spark plug to another cylinder yet?
While you have it out see if spark plug #4 is soaked in fuel or not.

After that I would look at the injector, then the CPS last based on your symptoms. Usually with a bad CPS your car won't start.

 

[Logan Savage]

Injector # 4 isn't firing . A noid light won't flash when connected to the connector of # 4 injector . The light flashes when connected to other injectors . As previously stated I have verified power on one wire at the connector & verified continuity of the other wire from the injector connector to the PCM . It seems unlikely that the camshaft position sensor would skip one cylinder only but I'm trying to find out if it's possible . I guess I'm hoping it isn't the PCM but more than likely it is .

 

[teeje]

Sorry you're correct. I was thinking of something else. Yes the cps sends a signal to the injector when the correct valve is open. However, these 3.7s were known for bad valve seats. I had the same issue. Let me guess. P0304? That's exactly what I got before I got a new engine. Run some marvel mystery oil in the tank but make sure to read the directions. May free up some carbon. If you haven't swapped the "bad" injector with a good one yet, start from there


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