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#1
08-06-2008, 05:38 PM
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Tapping noise from the engine
The past three months, there has been a tapping noise from the engine. Its on the passenger side. I have taken it to the dealer a couple of times. The first time I was quoted about 2000 to diagnose the problem with the lifter and replace it.
The second time, I was told there isn't much of a concern at this time and we can revisit this the next oil change. I have 78000 miles on it, hence its out of power train warranty. I have looked up on several forums and it seems several Nissan/Infiniti cars have had the same problem. Anyone outside of dealer isn't quite willing to work on engine problems. Tapping noise is very similar to this on youtube. http://www.youtube.com/watch?v=Hk5A6...eature=related Is anyone aware of Infiniti owning up in some way. I don't mind getting this fixed for half the price since I'm out of warranty. I just don't know how much of a concern this is for me to get it fixed right away. In fact the second time, the service rep goes, just drive for the next few days it could even last another 100 000 miles without causing any trouble. Then he goes perhaps in a few years a new engine might be cheaper than fixing this. I'm just confused what I should do at this time. Any recommendation is appreciated. Thanks in advance. PK 
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#2
08-06-2008, 05:41 PM
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take it to a performance shop!
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#3
08-06-2008, 05:43 PM
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Sounds like valve lash noise due to valve shim out of spec. When did it start happening? Diagnosing it wouldn't be that hard...just gotta take off the valve cover and measure using a feeler gauge to see if all shims are in specs. Had any work done on the heads lately?
Could also be a noisy injector....though I've not personally seen that before.
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2008 Ivory Pearl G35S 6mt Premium | 2007 Copper Red CX-7 Sport AWD
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#4
08-06-2008, 11:02 PM
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does the noise increase with throttle?
We had a noise like this in my fiance's 03 coupe. At first the dealership said it was normal, THEN, we finally got them to acknowledge that something was wrong and start taking apart the engine. The noise was diagonsed as coming from the head somewhere so it was believed to be some type of internal engine problem. They found fragments believed to be from the camshaft and the motor was replaced under warranty at about 40k miles. Being out of warranty, I would take your car into a place the specializes in nissans and see if they can determine where the noise is coming from.
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#5
08-06-2008, 11:24 PM
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Quote:
Thanks for your quick response. I cant say for sure if it increases with throttle. It seems to stay the same from idle. Truthfully, I'm concerned if there are fragments in there. The dealer has been saying it's the valve. Gosh, I'll shop around for a Nissan mechanic.
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#6
08-06-2008, 11:27 PM
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Quote:
Nope I didn't do any work at all whatsoever. I noticed this for the first time about three months ago. I'm in Virginia close to DC. If you guys know of any good mechanic in the area, I would love to have it checked out. I called a couple of places, so far no has stepped up to work on it. It seems everyone is holding back since its engine work. One mechanic recommended putting in a bottle of STP oil treatment.
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#7
08-06-2008, 11:51 PM
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Quote:
That definately won't fix it. For what it's worth, I rebuilt the head on my KA24DE engine and got the valve shims mixed up when I hottanked the head and got them out of order. As a result it made the same ticking noise that increased with throttle. I fixed it by taking off the valve cover and using the feeler gauge and the FSM to identify factory specs for tolerances. Reordering shims resolved the issue. If your cam lobe, for whatever reason, had unusual wear, it may simply be out of spec and could be fixed relatively easy with any somewhat skilled machinist. Here's a video of my 240 and what it sounded like when I was trying to diagnose my problem right after I got it put back together. 
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2008 Ivory Pearl G35S 6mt Premium | 2007 Copper Red CX-7 Sport AWD
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#8
08-07-2008, 12:08 PM
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Quote:
Thanks so much. I guess I need to find a mechanic thats willing to work on it.
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#9
08-07-2008, 06:47 PM
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It does sound like valve train noise. However check the fuel damper assembly which is located more to the passenger side. It can make a knocking sound like that. I had mine replaced.
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#10
09-13-2008, 04:21 PM
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These engines are extremely sensitive to oil levels and change intervals compared to older 2.0/2.4/3.0 liter versions. Why the owners manual warns that 90 day 3,750 intervals are necessay for extended engine life.
Lack of lube is the only thing that wears bucket lifter shims. As an experiment use BG Quick Clean for Engines to clean the varnish inside the bucket lifter.
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