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Old 05-11-2013, 08:44 PM   #1
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Crank Position Sensor. Help me find.

Ok, so my car killed on me at Starbucks. Took 6 or 7 times to get it to stay started. And the code once again was crank position sensor. Also threw a oil pressure sensor code this time. Oil pressure could have been because I kept having to restart it. (I was in the drive through line)

So which wire is it on the picture? All the wires look good and it's really tight. Changing it will be a major bitch looks like.

1. is a wire directly above the starter that you can't see.
2. is shown
3. is shown

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Old 05-11-2013, 09:13 PM   #2
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#2 is the crank sensor. Remove the starter and you can access the crank sensor easily.

#3 is the knock sensor.
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Old 05-11-2013, 09:14 PM   #3
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Damn. What a pita.


How does that go bad? And with it inside the rest of the harnesses it's going to be a pain. I don't even know where it goes to.
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Old 05-11-2013, 09:19 PM   #4
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The harness will unplug from the sensor, then use a 10mm socket to remove the sensor retaining bolt. You can leave the wires connected to the starter, remove the bolts and slide it out of the way. This will give you enough room to remove the crank sensor.
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Old 05-11-2013, 10:06 PM   #5
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Odd that a sensor can just go bad like that. Of course if this is my problem that I've had the past 2 years then I'd very much like that.

So I guess it's order time.


Oh MAUREEEEEEEEN.................... lmao


Rodgers Chevrolet to the rescue. hahahaha
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Old 05-11-2013, 10:17 PM   #6
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A quick check would be to backprobe the connector, one wire should have 5 volts + at key on, one wire should be ground and the other should have signal as you are turning the engine over by hand (socket on crank pulley etc). It should be on/off/on/off etc etc as the crankshaft reluctor ring passed over the sensor face.

if it doesn't register any signal, the sensor is probably bad, barring that the pin in the connector isn't getting a poor connection.
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Old 05-11-2013, 10:42 PM   #7
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Damn. What a pita.


How does that go bad? And with it inside the rest of the harnesses it's going to be a pain. I don't even know where it goes to.
If it turns out that it's not the sensor (I replaced mine and it turned out to be something else), let me know.
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Old 05-11-2013, 10:52 PM   #8
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I have seen issues with the harness rubbing on the motor mount bracket/block. The symptoms sound like a faulty crank sensor IMO.
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Old 05-12-2013, 12:28 AM   #9
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Quote:
Originally Posted by PQ View Post
Odd that a sensor can just go bad like that. Of course if this is my problem that I've had the past 2 years then I'd very much like that.

So I guess it's order time.


Oh MAUREEEEEEEEN.................... lmao


Rodgers Chevrolet to the rescue. hahahaha
Probably going to have to chalk it up to "S#%t Happens". My oil pressure sensor went out after 10 months. Replaced it and have had zero problems since.
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Old 05-12-2013, 12:58 AM   #10
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Think about it this way. Everything breaks eventually. Eventually has to be sometime. Why not now?
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01000111011011110110111101100100001000000110110001 11010101100011011010110010000001110111011010010111 01000110100000100000011101000110100001101001011100 110010000001101111011011100110010100100001

x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1
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Old 05-12-2013, 01:55 AM   #11
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Quote:
Originally Posted by Rhino79 View Post
A quick check would be to backprobe the connector, one wire should have 5 volts + at key on, one wire should be ground and the other should have signal as you are turning the engine over by hand (socket on crank pulley etc). It should be on/off/on/off etc etc as the crankshaft reluctor ring passed over the sensor face.

if it doesn't register any signal, the sensor is probably bad, barring that the pin in the connector isn't getting a poor connection.
Easier to just replace the sensor and see.

Quote:
Originally Posted by CamaroLoco View Post
If it turns out that it's not the sensor (I replaced mine and it turned out to be something else), let me know.
Ok.

Quote:
Originally Posted by LSX Camaro View Post
I have seen issues with the harness rubbing on the motor mount bracket/block. The symptoms sound like a faulty crank sensor IMO.
Yup, I looked for any sign of that. I REALLY hoped to find some. But it all looks good.

Quote:
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Probably going to have to chalk it up to "S#%t Happens". My oil pressure sensor went out after 10 months. Replaced it and have had zero problems since.
I'd have to take the blower back off to get to the OPS.
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Old 05-12-2013, 01:57 AM   #12
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Think about it this way. Everything breaks eventually. Eventually has to be sometime. Why not now?
I suppose. Be nice to get it to quit dying under load at idle speed. AND to get it to not hesitate when gassing on it. It will just sit there for a small moment when I put it in gear and push the gas. Then just go.
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Old 05-12-2013, 08:14 AM   #13
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Pq have you ever checked your ignition system?
Checked spark plugs?
TB?
Checked on a dyno?
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Old 05-12-2013, 09:04 AM   #14
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The old crank position sensor/check stabilitrac/ reduced power mode problem crops up again. Seems to occur for many when the battery is low or the starter is having difficulty turning the motor. I have it crop up occasionally since installing the ERL 500 cu in motor when the motor's hot, battery is hot......everything is hot. Once it cools down it will fire right up properly. We've pulled and checked everything. It's almost like the starter is pulling all the power/amperage from the battery and the ECU get's messed up temporarily. I'm going to run a larger gauge power wire from the battery first followed by a high torque starter.....if it will fit down there now.
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Old 05-12-2013, 01:47 PM   #15
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Quote:
Originally Posted by Doubleblank View Post
The old crank position sensor/check stabilitrac/ reduced power mode problem crops up again. Seems to occur for many when the battery is low or the starter is having difficulty turning the motor. I have it crop up occasionally since installing the ERL 500 cu in motor when the motor's hot, battery is hot......everything is hot. Once it cools down it will fire right up properly. We've pulled and checked everything. It's almost like the starter is pulling all the power/amperage from the battery and the ECU get's messed up temporarily. I'm going to run a larger gauge power wire from the battery first followed by a high torque starter.....if it will fit down there now.
^
That's what it was for me....was happening 1-2 times a month (whether the engine was hot or cold)....battery was only 2yrs old....replaced it (after replacing the crankshaft sensor, insulating each individual wire in the harness, etc.) and it didn't happen again for about 6-7 months until the weather got hot.....then the engine would get hot as would the starter and she wouldn't crank until she cooled down a little.
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Old 05-12-2013, 02:02 PM   #16
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A lot of times even just adding a heavy ground from the battery to the engine will help reduce the current drop.
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Old 05-12-2013, 05:51 PM   #17
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Quote:
Originally Posted by litle88 View Post
Pq have you ever checked your ignition system?
Checked spark plugs?
TB?
Checked on a dyno?
Yes to all. But not since the cel was beginning to come on.


Quote:
Originally Posted by Doubleblank View Post
The old crank position sensor/check stabilitrac/ reduced power mode problem crops up again. Seems to occur for many when the battery is low or the starter is having difficulty turning the motor. I have it crop up occasionally since installing the ERL 500 cu in motor when the motor's hot, battery is hot......everything is hot. Once it cools down it will fire right up properly. We've pulled and checked everything. It's almost like the starter is pulling all the power/amperage from the battery and the ECU get's messed up temporarily. I'm going to run a larger gauge power wire from the battery first followed by a high torque starter.....if it will fit down there now.
Quote:
Originally Posted by CamaroLoco View Post
^
That's what it was for me....was happening 1-2 times a month (whether the engine was hot or cold)....battery was only 2yrs old....replaced it (after replacing the crankshaft sensor, insulating each individual wire in the harness, etc.) and it didn't happen again for about 6-7 months until the weather got hot.....then the engine would get hot as would the starter and she wouldn't crank until she cooled down a little.
Quote:
Originally Posted by Rhino79 View Post
A lot of times even just adding a heavy ground from the battery to the engine will help reduce the current drop.
Are we saying it could just be the battery here?
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