Replacing Cam sensor, got it replaced, missing magnet??..... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-14-2008, 06:36 PM   #1
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Default Replacing Cam sensor, got it replaced, missing magnet??.....

Ok so my Cam sensor bit the dust today. Code 41, SES is on and won't go off, so I went and picked a new one up. Problem is, I only have a generic explanation of where it is, and I can't find it, and I need to know what I have to remove to get to it. Would someone happen to have a pic of where it'* at? TIA!
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Old 02-14-2008, 06:56 PM   #2
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Old 02-14-2008, 07:05 PM   #3
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Default Re: Need help replacing Cam sensor. I can't find it!

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Old 02-14-2008, 07:32 PM   #4
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let us know if that does it. cuz most times that code comes up, it ends up being the magnet thats on the cam gear. and not the sensor itself.
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Old 02-14-2008, 07:40 PM   #5
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the magnets on the cam gear


what goes wrong with them ?

how common ?

they fall off the gear or something ??

interesting, never heard this one before

good luck
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Old 02-14-2008, 07:45 PM   #6
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Quote:
Originally Posted by fast68
they fall off the gear or something ??
Yes, The magnet is in a plastic clip and stuck through a hole in the timing chain sprocket. After years of getting cooked in oil, the plastic becomes brittle and then breaks, letting the magnet fall out.

Here'* mine during the rebuild (as seen from the block side of the sprocket) I've used JB-Weld to permanently glue the magnet and it'* plastic holder in place on the sprocket, even though the plastic clip holder had not broken (yet)

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Old 02-14-2008, 08:37 PM   #7
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wow that sucks

ill have to remember that one for future use


thanks for learning me on that one haha
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Old 02-14-2008, 09:23 PM   #8
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Quote:
Originally Posted by fast68
wow that sucksthanks for learning me on that one haha
No sweat. There'* been a couple of threads on this over the years, including how to carry out the fix with the timing cover still on the motor. I had mine apart already, so I couldn't see putting it all back together without inserting a little extra insurance...it'* such a simple part, but "she a no wanna run without it"
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Old 02-15-2008, 06:08 PM   #9
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I just can't catch a break, can I?

Pulled the sensor out, and I knew something was up when I saw this -

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So I proceeded to put the new one in, got everything back on, hooked the battery up, started it, and WHAMO 5 seconds later, SES just a glowin' away. Code 41 again. So, I am assuming by the marks on the sensor, the magnet fell out. Just what I needed.... Now to only wait until it'* warm to replace it. Might as well do the timing chain and tensioner. :(
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Old 02-15-2008, 07:28 PM   #10
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Quote:
Originally Posted by Bonneville92V688
So, I am assuming by the marks on the sensor, the magnet fell out. Just what I needed.... Now to only wait until it'* warm to replace it. Might as well do the timing chain and tensioner. :(
That'* a pretty safe assumption, but one that can be easily proven without too much work.

1.) Take the sensor back out, disconnect the ignition at the module, then remove the spark plugs (just to make it easier to turn over by hand.)

2.) Rotate the motor by hand while watching the cam sprocket. It may take as much as two complete revolutions to bring the cam sprocket around to where the magnet should be. (Note, the hole with the magnet will be different than the other lightening holes..it is closer to the chain and will line up better with the hole in the timing cover.)

If you don't see the black disk of the magnet, then it'* down in the pan someplace, stuck to one of the main caps, or got destroyed by the moving parts under the timing cover.

At this point, look up one of the old threads on how to put the magnet back in without taking off the timing cover.
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