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Old 09-19-2009, 09:09 PM   #1 (permalink)
smokin6.5L
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how can you tell when the crank position sensor is going bad

hey just a question how can you tell when your crankshaft position sensor is going bad or bad i have no check engine lights but im just curious as to what you have seen differently about your truck when this is going bad or is bad
thank you for the info.
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Old 09-19-2009, 09:14 PM   #2 (permalink)
woodchuck2
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Most of the time the engine will suddenly just not start, but i seen some that will quit while going down the road but restart after a short cooldown. Usually the tach in the dash wont move when cranking either. You can check it with an Ohm meter by waving a wrench in front of it. Is your 8.1 giving you a problem? They were noted for crank sensors when that engine first came out.
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Old 09-19-2009, 09:17 PM   #3 (permalink)
smokin6.5L
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no its not giving me a problem i am just curious to know some of the symptoms cause i want to know when its going bad
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2002 chevy 2500HD 8.1L with the ally, K&N intake, Airaid throttle body spacer, ported and polished throttle body, westers custom tune, true dual 3in exhaust with super 44's, honed injectors. Another fun one
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Old 09-19-2009, 10:36 PM   #4 (permalink)
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It will run with about the same symptoms as if you unplugged half of your spark plug wires. Really.
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Old 09-20-2009, 10:08 PM   #5 (permalink)
vern650
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when mine went bad at first it would occasionaly miss while cruising down the road, nothin major just a miss here or there. then every once in a while it would just shut off goin down the road but would fire right back up. when it was doin this there was no check engine light. then one day after work it wouldnt start for like 20 minutes then when it finaly started it finaly turned the light on and thats when i changed it.
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Old 09-21-2009, 01:19 PM   #6 (permalink)
PAUL3500
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How big of a job is it to change out and what is the cost to have a dealer do it?
Just curious....
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Old 09-21-2009, 02:16 PM   #7 (permalink)
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You need to do it from underneath. I put the truck up on ramps, let it cool down and took out the bolt that holds the sensor using a 10mm ratchet wrench (if you don't have one, get one). Liberally spray on some penetrating oil, work the old sensor loose and carefully move it upward (I tapped it a little with a long screwdriver and small crow bar). Once you have the first O-ring of the sensor out of the hole, apply some more penetrating oil and continue to carefully move the old sensor out.
I am not sure how much the dealer would charge to do this, but I read somewhere that it wasn't cheap.
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Old 09-21-2009, 08:07 PM   #8 (permalink)
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crank sensor

I had to replace both batteries in my 03 last week. I disconnected my Edge while I had the batteries out and when I installed the two new batteries the truck would turn over for 4 or so seconds and then stop (never starting). I plugged the Edge back in that the truck started right up with an engine light code for malfuntioning crank sensor. I unplugged the Egde again and it wouldn't start just like the first time. I plugged the Edge back in, cleared the code and it is running fine. Is the Edge covering up the problem of a bad crank sensor?
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Old 09-21-2009, 08:34 PM   #9 (permalink)
PAUL3500
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I'm wondering if this is inevitable and should it be changed as a preventitive maintenance issue or is it just happening to some 8100's ?
I am new to this stuff and trying to get a handel on the things I need to watch out for.
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Old 09-21-2009, 09:34 PM   #10 (permalink)
vern650
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Quote:
Originally Posted by PAUL3500 View Post
I'm wondering if this is inevitable and should it be changed as a preventitive maintenance issue or is it just happening to some 8100's ?
I am new to this stuff and trying to get a handel on the things I need to watch out for.
'01-'02 8.1's had bad sensors and were pretty common for them going out. i believe they even made it a recall after a while. the '03 and newer have better sensors and don't have near the issues with them as the '01-'02s. so your '04 shouldnt be an issue, my brothers '03 has around 180,000 miles and is still rollin on the original sensor.
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Last edited by vern650; 09-21-2009 at 09:36 PM.
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