[Gmecm] erratic 3.8L Cam sensor alarms

[Scott Feaver]

I wondered if that was possible to do that way.   In my case however, the 
magnet had been chewed up a bit and was sticking inside the timing cover all 
over.  I had to pull it all apart to clean it up.

I believe I got the part from Autozone for about 8 bucks or so.

Scott
----- Original Message ----- 
From: "David Allen" <davida1 at hiwaay.net>
To: <gmecm at diy-efi.org>
Sent: Sunday, October 08, 2006 5:12 PM
Subject: Re: [Gmecm] erratic 3.8L Cam sensor alarms


> IIRC the magnet IS indeed replacable.  In fact I have replaced several; 
> working throug the sensor hole wihtout engine disassembly.
> David
>
>
> ----- Original Message ----- 
> From: "Ron Drew" <rjdrew at adelphia.net>
> To: <gmecm at diy-efi.org>
> Sent: Sunday, October 08, 2006 3:44 PM
> Subject: Re: [Gmecm] erratic 3.8L Cam sensor alarms
>
>
>> Many thanks Scott; I think that you have led me to the problem. I 
>> understand
>> that the magnet is not replaceable; so I'm planning to replace the timing
>> set.
>>
>> Ron
>>
>> ----- Original Message ----- 
>> From: "Scott Feaver" <sfeaver at magma.ca>
>> To: <gmecm at diy-efi.org>
>> Sent: Sunday, October 08, 2006 10:52 AM
>> Subject: Re: [Gmecm] erratic 3.8L Cam sensor alarms
>>
>>
>>>I had my magnet come out of the sproket at about 130k miles.   Its held 
>>>in
>>>a plastic retainer and it disintegrated.    Maybe its starting in your
>>>case, and its position drifts slightly back where the sensor wont pick it
>>>up..
>>>
>>> Scott
>>> ----- Original Message ----- 
>>> From: "Ron Drew" <rjdrew at adelphia.net>
>>> To: <gmecm at diy-efi.org>
>>> Sent: Sunday, October 08, 2006 10:09 AM
>>> Subject: [Gmecm] erratic 3.8L Cam sensor alarms
>>>
>>>
>>>> Has anyone experienced problems with a GM 3.8L (1989 with 122K miles)
>>>> missing cam position pulses? More specifically, the pulses generally
>>>> begin to miss when the car has been driven for a while on warmer days;
>>>> and it only seems to trigger the alarm at lower speeds.
>>>>
>>>> This what I have done:
>>>> - I replaced the ECM with a known good spare which did not help.
>>>> - I've tried a couple of different brands of sensors, which did not 
>>>> help
>>>> (they all behave the same).
>>>> - The crank sensor works flawlessly; the cam sensor shares the same '+
>>>> volts' & 'ground' with the crank sensor, so any problems with the '+
>>>> volts' and 'ground' would need to exist on a very short run of wiring
>>>> between the Crank and cam position sensors.
>>>> - I have not yet scoped the sensor line going back to the ECM.
>>>>
>>>> I suspect the problem may be with the position indicator mounted on the
>>>> cam sprocket. I don't know if this is a permament magnet or a normal
>>>> piece of metal. As far as I can tell there is no magnetism in the
>>>> position indicator. BTW I may go weeks and not see an alarm, so the
>>>> problem can be very erratic.
>>>>
>>>> I thought I'd check here and see if nayone has experienced this or has
>>>> any ideas.
>>>>
>>>> Thanks
>>>> Ron
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>>>
>>>
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>>
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