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Old 10-13-2009, 11:02 PM   #1
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Cool Cam sensor location 1988 Bonneville

Where is the cam sensor on a 1988 Pontiac Bonneville? None of my books really show where it is at. Anyone have a picture of the location? Also, the battery is intermittently being drained but I can't find the source. It goes from say 12.5V down to 12V overnight. In a few days it may go down to 8 volts. I have a VOM and a AC/DC clamp on ammeter. Or do I need to get a gauge that shows milliamps ? Thanks for any help. I really want to keep my old Bonny on the road. I bought her new and now have 187,000 miles on her. Thanks again, Gary
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Old 10-14-2009, 09:16 AM   #2
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It should be located down and to the left of the WP pulley.
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Old 10-14-2009, 09:40 AM   #3
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Quote:
Originally Posted by GaryH View Post
Where is the cam sensor on a 1988 Pontiac Bonneville? None of my books really show where it is at. Anyone have a picture of the location? Also, the battery is intermittently being drained but I can't find the source. It goes from say 12.5V down to 12V overnight. In a few days it may go down to 8 volts. I have a VOM and a AC/DC clamp on ammeter. Or do I need to get a gauge that shows milliamps ? Thanks for any help. I really want to keep my old Bonny on the road. I bought her new and now have 187,000 miles on her. Thanks again, Gary

How old is the bateery? maybe pull it and have it tested at a parts store. Same with the alternator.
But if you have a draw you will need to put the VOM in line between the negative battery cable and the battery. Put the red lead on the negative cable and the negative lead on the battery. I would start by measuring amps. If you dont get a reading then switch down to milliamps. If is more than about 250 mA than you have a draw. If you have any add ons to the car IE stereo, video, amps etc, I would disconect those to start and see if those are the draw. If those don't do it than you would need to start pulling fuses to see what circuiot has the draw. You will need wiring diagrams to figure what is on each circuit.
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Old 10-14-2009, 11:39 PM   #4
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Thanks for the info. The battery is almost new, bought it in May of this year. I just replaced the alternator a couple of months ago. I have a lifetime one from Schucks. I think I am on my 3rd alternator in about 6 yrs or more though. It paid to go with the lifetime guaranteed one. The only aftermarket item is the cd player my son and I installed.a couple of years ago. It doesn't have a lot of clearance behind the radio so I think thats the first place I will look. I replaced the power antenna with a non-power one about 5 years ago or more. I will recheck the wiring and make sure it is taped off. Thanks again. Gary
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Old 10-15-2009, 11:04 PM   #5
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Why do you need the Cam Sensor? If your Check Engine light is showing CS, and you replace the CS and it'* still on, the problem you have is the Magnetic Pick-Up on the Cam Gear. You'll need to pull the HB and remove cover....while you're at it you might as well replace chain and gears.
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Old 10-17-2009, 01:33 AM   #6
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I got the code for something wrong in the cam sensor circuit. I think it is code 41. I don't even know where the cam sensor is yet. I haven't replaced it yet. The car tries to hesitate when you pull away from a stop sign. Any pictures of where the sensor is at would be greatly appreciated. 1988 Bonneville engine code c. Thanks, Gary
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Old 10-17-2009, 10:27 AM   #7
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Just a suggestion, but if you are going to be maintaining your Bonneville to keep her on the road, you might want to invest in a factory service manual. Here'* one on Ebay for $20: 1988 Pontiac Bonneville Service Shop Repair Manual Oem :eBay Motors (item 400068228444 end time Nov-15-09 17:57:36 PST)
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Old 10-22-2009, 04:25 PM   #8
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hi, the sensor is behind just behind the crankshaft pulley. You can easily get to it from the right, front wheel well. Just remove the plastic shield between the well and the engine compartment. The sensor is fastened with just one small bolt and can then be removed.

I just had a problem with camshaft sensor but the issue was the magnet fitted on the camshaft itself. This is normally a quite extensive job as the cover plate needs to be removed. However, it was a method desribed on the Internet on how to do this by cementing a new magnet onto the camshaft, working through the hole for the sensor and not removing the plate. I did this and it works just fine. I've tried to find the location on internet but not been able to find it again....:(
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Old 10-22-2009, 08:18 PM   #9
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Code 41: lost cam magnet in 3800

hope that link will help, it will atleast show you where it is. Good Luck.

Last edited by sir_raric; 10-23-2009 at 02:15 AM. Reason: typo
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