I really need help on this camshaft postion sensor. I don't know where it is located. And if i can find that i could change it out.

the car is 95 cadillac sedan deville with a 4.9 engine.

I don't believe the 4.9 has a cam or crank sensor; its got a distributor.

Yes, there is a camshaft position sensor on the 4.9, also known as a hall effect switch. I've had to replace the one in my '91 DeVille twice (first replacement was defective).

You'll need to remove the distributor cap and disconnect the spark plug wires; make sure you mark the spark plug wires so you put them back in the right place. Once you have the distributor cap off, you'll need to remove the rotor cap.

Access to the cam sensor is pretty tight. You'll need a 1/4" open end wrench to remove the mounting bolts. Be careful when removing the electrical connectors; they tend to be very brittle and will easily break.

While you have the distributor cap off, you might also replace the ignition control module. I think it's a $30 part and access is easier than the cam sensor. I had trouble with my DeVille stalling and stumbling, but a new iginition module cured it.

thanks that helps i already replaced the module yesterday. Im gonna try the cam today.

I took off the cap and rotor and i have been looking everywhere but i still can't see the CMP Sensor

I believe you will have to pull the distributor to access the hall effect switch that is the cam position sensor. It is under the plate the HEI module is attached to and to remove the plate you have to remove the distributor, remove the distributor gear (drive out the roll pin), pull the distributor shaft out and remove the base plate. Similar to replacing the pickup coil for the star wheel....which would be another good preventive maintenance thing to replace while the distributor is out.

that sux why doesn't the freaking parts come with instructions man this is so frustrating.

okay i have to take off the copper plate underneath the rotor.then take the modules out and then i can get access to the CMP?

You don't have to remove the plate (I didn't). It's just hard to get your wrench on the nut with the plate in the way. But it can be done (and I'm no Mr. Goodwrench by any stretch of the imagination).

Unless the '95 4.9 is different from my '91 (and I don't know why it would be), you should be able to see the cam sensor with the distributor cap and rotor cap off. If the ignition control module is at 12 o'clock, the cam sensor would be at 6 o'clock.

There is a picture of the cam sensor in my Haynes shop manual, figure 10.1a on page 6-17. If you still don't see it, let me know, and I'll scan the page so you can see the picture.

Hope this helps.

my module was at 6 o clock. and my cmp is a 3 dimensional thing.
it looks like this

http://www.smpcorp.com/web_app/catalog/images/PC31.jpg

yea if you would scan that for me. you could leave it on this thread that would be helpful to me.

thanks

Boy, I don't recognize what's in your picture at all. Maybe they did change the setup from 91 to 95. It is a 4.9 and not a Northstar, right?

Anyway, here's the scan from my shop manual. Not sure if it will help you at all, but maybe it will help somebody.

Good luck!

http://www.gdwriter.com/cruella/cam_sensor.jpg

well that sux. but thanks anyway. guess i need to get some more info some where. any suggestions

my module was at 6 o clock. and my cmp is a 3 dimensional thing.
it looks like this

http://www.smpcorp.com/web_app/catalog/images/PC31.jpg

yea if you would scan that for me. you could leave it on this thread that would be helpful to me.

thanks



That is the cam position sensor for the Northstar engine. Wrong part.....

actually i don't think it is unless this website is wrong.

http://www.rockauto.com/catalog/catalog.php?carcode=1025783&parttype=7192

click on more info and you will see the pic of the part.

Well, the Rock Auto Web site is sort of wrong. The part you're seeing is definitely not for the 4.9. Part of the problem is terminology since the part is also known as a hall effect switch. On a search for hall effect switch (http://www.rockauto.com/catalog/catalog.php?carcode=1025783&parttype=4464) for a '95 DeVille with a 4.9 on Rock Auto, I found this:

http://www.smpcorp.com/web_app/catalog/images/LX370.jpg

Just to confirm, I also looked up the part on the NAPA Web site (http://www.napaonline.com/masterpages/NOLMaster.aspx?PageId=470&LineCode=ECH&PartNumber=MP135&Description=Hall+Effect+Switch):

http://partimages.genpt.com/partimages/100162.jpg

So that picture I scanned from my shop manual is correct for your car. Hope this clears things up for you.
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If I had known this is what friends are for, I would have signed up as an enemy! — Ethel Mertz

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well that is good news for me. Cuz i can change that thing alot more easier than the thing that i have. BTW wtf is the thing that i have anyway those moron's at o'riely's sold me that thing and they are def gonna get that thing back. So when i ask for one i should ask for a hall effect switch? And i will get one of those things. And if it does not fix my wierd problem i don't what to do next fuel injectors?

this thread relates to my http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/72216-my-caddy-having-start-up-problem.html
thread

They probably assumed you had a Northstar since it's a '95. Having the same part with two different names confuses things, too.

If you do change out the fuel injectors, I highly recommend the ones from FiveOMotorsport.com (http://www.fiveomotorsport.com). Good price, and they work great. I noticed a definite improvement in throttle response and overall performance, and my 4.9 has 200,000+ miles on it. Youbetcha77 recommended them to me and to others who have had good results.
__________________
If I had known this is what friends are for, I would have signed up as an enemy! — Ethel Mertz

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yea im pretty upset about this i don't think i will shop at that o'rielly's anymore. Oh well what am i saying i know i will go back. If i ask em for a hall effect switch and describe what i am talking about over the phone the can't screw that up right?

It won't be till friday or saturday until i do this. Cuz im away from my car right now.

thanks

What you show is the cam sensor for a Northstar. In '95 there were two engines available; the 4.9 and the 4.6 Northstar. Two completely different engines.
This happens alot in the parts business. I'm looking for a A/C compressor for a '93 Eldo, and the one listed is for a Northstar. Problem is, I have the 4.9. The base Eldo got the 4.9, the upscale ones got the Northstar.

man its hard to get to those bolts on mine with a ratchet i think im gonna have to go with a 1/4 wrench might work better. cuz mines in a sucky spot. I got the main clip off. And after i get those two bolts is there any more to look for?

I had no luck with a socket either. Had to use an open-ended wrench. It's tough to get at and you'll cuss a lot, but it can be done.
__________________
If I had known this is what friends are for, I would have signed up as an enemy! — Ethel Mertz

http://www.gdwriter.com/images/ethel.jpg

I had no luck with a socket either. Had to use an open-ended wrench. It's tough to get at and you'll cuss a lot, but it can be done.
__________________
If I had known this is what friends are for, I would have signed up as an enemy! — Ethel Mertz

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okay i got it off now is there anything that i should look for. Could you talk to me on aim about this. jamique315.

thanks

man i did not realize how expensive this part was. I got it at napa auto parts and it costs 112 dollars. i hope this fixes my problem though it had to be shiped and won't be here til monday. argh