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Old 06-10-2010, 07:50 AM   #1
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Cam Position Sensor tapping

Hey everyone,

My 2001 4.0L has started its mysterious ticking/tapping.

After further inspection I noticed that the sound was coming from the Cam Position Sensor (the sensor right in front of the oil filter on the left side of the engine).

I can actually put my hand on the sensor and feel a physical tapping coming from it. It gets stronger/louder when the engine revs and seems to subside above 2000rpm. Also it gets louder when the engine gets warm.

How hard is it to replace the Cam Position Sensor? Is there anything in it that could cause this tapping?

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Old 06-10-2010, 08:04 AM   #2
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well im having the same issue my friend. Did you start noticing the ticking noise after changing oil or spark plugs? I havent checked my sensor yet...but thats a good idea. I've come to the conclusion that I have bad lifters.

The ticking noise in my engine is comes and goes right after a cold start up. after the engine warms up and the oil is flowing...it fades away.

I also thought it could be a broken piston skirt (GOD I HOPE NOT) but its not making a constant knocking noise so I can rule that out. But just to be safe im going to drop the oil pan and check them.

I've tried alot of things and im still working on this idea:
4.0L requires 6 quarts of oil.
I took 1 qt of marvel mystery oil and 5 qts of Mobile 1 10w30 full synth. Going to run that solution for a while and see if I cant clean the lifters off. The ticking noise could be from just that...dirty lifters. If this doesnt work...im going to replace the lifters and the cam.

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Old 06-10-2010, 02:59 PM   #3
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Mine did not start on any given occasion. I purchased it used and drove about 1000 miles and then I started to notice it.

Mine is only related to the RPM's after it warms up from sitting for more than an hour. Once it is warm and I am below 2k RPM's TICK TICK TICK. Above 2k VRRRROOOOOM.

I checked it at lunch and am pretty positive it is coming directly from the Cam Position Sensor. Ill take it off and take a look at it tonight. Does the Cam Position sensor just naturally make noise?
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Old 06-10-2010, 08:08 PM   #4
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if its right in front of the oil filter I think its the oil sending unit not the cam sensor....
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Old 06-11-2010, 07:51 AM   #5
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Hey there.

Ive been searching all morning and I have the SAME exact problem. I actually have a 04 grand cherokee with the 4.0 but I have the same ticking coming from the cam position sensor and cant figure out what it is.

I was almost thinking about taking it to the dealer today just because I was worried about it and local shops didnt seem to even be able to figure out it was coming from there.
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Old 06-11-2010, 08:05 AM   #6
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I didn't get a chance to look at it last night, but it is for sure on the to do list this weekend. Along with an oil change.

I took mine to a local Jeep specialist. First they said they couldn't find any noise and then they told me it was a lifter and it would cost $1000.

So I asked them why is it coming from the cam sensor? And he replied try some snake oil.....or we can replace the sensor for $700....

OK thanks pal. I'll be in my garage fixing my jeep while you lower your prices.
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Old 06-11-2010, 08:38 AM   #7
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Well I decided to call around and see how much it would cost to take a look at it.

The local jeep dealer, whos only a couple blocks away, said they would look at it for 20$. So I drove it down there and walked back home. I usually wouldnt take it to a dealer except Im supposed to be taking a couple hundred mile trip tomorrow and dont want to be stuck on the side of the road.
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Old 06-11-2010, 02:23 PM   #8
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Cool please let me know what the dealership says. I am very curious.
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Old 06-11-2010, 03:34 PM   #9
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Just FYI ... this is CPS (driver's side bell housing)


And this is Oil Pressure sending unit (next to oil filter)
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Old 06-11-2010, 06:48 PM   #10
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Old 06-12-2010, 11:57 AM   #11
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Yup yup thats my post alright.

Sorry I didnt respond yesterday, but anyways the dealer was "swamped" and didnt have a chance to look at it. I have an appointment Tuesday.

Ive been driving it for the last couple of days and nothing seems to be wrong with it. Im supposed to be taking about a 80 mile drive later today, I guess well see if I end up on the side of the road.

Im really not sure what it could be. The sensor is attached to the top of the oil pump drive shaft so Im not sure if its the oil pump ticking, or the camshaft ticking or just the sensor itself is busted.
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Old 06-12-2010, 12:40 PM   #12
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ty for the information on the ticking sound comming from my camshaft positioning sensor i am more than posative that it is making the sound i hear i will try to take it in to dealer to see if they can fix it and if they can i will let you know
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Old 06-12-2010, 12:49 PM   #13
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Huh, it seems this is more common then I thought. Ive searched all over the internet and couldnt find anything at all about this and now 3 people at the same time are talking about it.
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Old 06-12-2010, 05:03 PM   #14
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I keep putting it off but I am going to dig into it this weekend. I found another post about 2004-2006 having a TSB on the oil pump drive. The gear wasn't built porperly and it was shearing he teeth. One of the symptoms was ticking. But again this isn't my year and I am pretty sure I have a different design.
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Old 06-13-2010, 02:39 PM   #15
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My tapping is coming from the oil pump drive tapping the inside of the cam sensor as it spins. It looks like the oil pump drive has too much play in it. On both the drive and the sensor I can see excessive wear and marking from where they hit each other.

Look like I will be replacing both of them next weekend.

Did anyone else have any findings?
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Old 06-14-2010, 01:02 PM   #16
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This guy has a write up and pictures. Seems to be the same problem as mine.

Replacing the Camshaft Synchronizer - Quadratec Jeep Forum
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Old 06-15-2010, 08:16 PM   #17
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Hey sorry I havent posted, Ive been super busy with work and I managed to pop one of my tires etc, its been crazy.

Anyways I took it into the dealer today and they "looked at it" said they couldnt find anything but some lifter noise. Oh well we seem to know whats up with it.

I think Im going to order one of those cam synchronizers here soon.

Only thing Im worried about is installing it and making sure it is lined up perfectly.
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Old 06-15-2010, 08:45 PM   #18
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I think Im going to get one, install it and get it right over to the dealer to have them time it correctly, I believe my current one if off slightly as well.
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Old 06-16-2010, 07:47 AM   #19
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Yeah that's my plan too.

But before you order it make sure its the problem. Its really simple, unscrew the two bolts from the cam sensor and then touch the pulse ring if it moves you might think about replacing it. Mine also had shavings from the cam sensor sitting all around the pulse ring.
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Old 06-16-2010, 08:51 AM   #20
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Quote:
Originally Posted by xxloaf View Post

Ive been driving it for the last couple of days and nothing seems to be wrong with it. Im supposed to be taking about a 80 mile drive later today, I guess well see if I end up on the side of the road.

.
I've driven my jeep about 23,500 miles over the last 1 1/2 years with the infomous "ticking sound" and haven't been stranded yet.
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Old 06-16-2010, 09:36 AM   #21
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Originally Posted by ttuley View Post
Yeah that's my plan too.

But before you order it make sure its the problem. Its really simple, unscrew the two bolts from the cam sensor and then touch the pulse ring if it moves you might think about replacing it. Mine also had shavings from the cam sensor sitting all around the pulse ring.
Yeah Im going to check it out later after work and see what I need to replace.

I already have an appointment with the dealer for tomorrow to get the syncronizer aligned either way because last week I pulled the whole thing off and I can tell its not timed quite right.(I had no idea what the thing even was when I pulled it out, so I didnt make reference marks or anything)
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Old 06-17-2010, 08:43 AM   #22
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So I picked up a new synchronizer from NAPA this morning, and the thing did not fit. It looked exactly the same but the shaft that entered the block was just slightly too large. I tried lubing it up with some oil and twisting it in but it was just going to get stuck. Plus the new sensor that came with it didnt fit the plug...just like in that guys post.

I just got back from returning it. Anyways I pulled the old sensor and shaft out and cleaned up. After installing it the noise seems to have gone away for the most part.

I still took it down to the dealer to have them align it because it took me about 5 tries to get it in correctly and running without misfiring.
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Old 06-17-2010, 07:50 PM   #23
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The part I ordered was exactly you explained. It was made in china and sold by Dorman part #689-200. I hoped I could get away cheap....

But after I got it out I could see excessive wear on the gear and the pump drive. So it looks like it is a must for me to replace. I called and ordered one from Jeep $270......but at least it will be right.

The good news is that I marked the drive and replaced it exactly as it should be and she started like a champ!
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Old 06-20-2010, 12:02 AM   #24
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Installed the part today and........Fixed! No more ticking or tapping from the engine bay.

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