Does this sound like a problem with the Crankshaft Position Sensor?
1994 sport, all stock daily driver in otherwise great condition. 4.0, AW4, 120k
This CPS is new, installed about five months ago.
I have just tested it with an Ohmmeter, and found 100% resistance between terminals B and C through the sensor.
Unlike the last time the CPS died, the key-on OBD display is currently showing no codes.
Temperatures have been below freezing here lately.
I’ve read many CPS threads here, and I know CPS problems can be intermittent, but this is curious because there is one other preceding factor here – If the engine is cold, it will only start if the engine has not yet been turned over. If it's cold and hasn't been cranked, it’ll start right up, but if the engine has run for a minute or more, it’s dead for the rest of the day. If it does start, it runs without hesitation.
Here’s what I observed:
1. I went out yesterday morning to start the car, and it fired right up perfectly.
A minute later, I turned off the engine and walked away. A few minutes after that, I tried to start it again, but it would not catch. – Just cranking, but no fire at all.
2. So, it sat all day. Come evening, I tried again. It started right up nicely without any hesitation. I left it idling until the engine was warm, and it ran smoothly the entire time.
I then shut it off and restarted a bunch of times to test it out, and it always worked great – It’s like there was never a problem.
3. This morning, it again started up instantly. I moved the car a few feet and shut it off.
A minute later, I’m back to no start - the same problem has returned – just cranks; barely catches, coughs once and dies. Further cranking results in nothing but a dead battery.
So, considering these events, and the fact that the sensor tests okay, do Y’all think I should be considering something other than a new crankshaft position sensor?
1994 sport, all stock daily driver in otherwise great condition. 4.0, AW4, 120k
This CPS is new, installed about five months ago.
I have just tested it with an Ohmmeter, and found 100% resistance between terminals B and C through the sensor.
Unlike the last time the CPS died, the key-on OBD display is currently showing no codes.
Temperatures have been below freezing here lately.
I’ve read many CPS threads here, and I know CPS problems can be intermittent, but this is curious because there is one other preceding factor here – If the engine is cold, it will only start if the engine has not yet been turned over. If it's cold and hasn't been cranked, it’ll start right up, but if the engine has run for a minute or more, it’s dead for the rest of the day. If it does start, it runs without hesitation.
Here’s what I observed:
1. I went out yesterday morning to start the car, and it fired right up perfectly.
A minute later, I turned off the engine and walked away. A few minutes after that, I tried to start it again, but it would not catch. – Just cranking, but no fire at all.
2. So, it sat all day. Come evening, I tried again. It started right up nicely without any hesitation. I left it idling until the engine was warm, and it ran smoothly the entire time.
I then shut it off and restarted a bunch of times to test it out, and it always worked great – It’s like there was never a problem.
3. This morning, it again started up instantly. I moved the car a few feet and shut it off.
A minute later, I’m back to no start - the same problem has returned – just cranks; barely catches, coughs once and dies. Further cranking results in nothing but a dead battery.
So, considering these events, and the fact that the sensor tests okay, do Y’all think I should be considering something other than a new crankshaft position sensor?
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