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Old 05-14-2017, 04:47 PM   #1
Malango
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[2001 GTS] Strange knocking noise after fully warmed up.

Hey guys, this is my first post on the forums mostly because I can't seem to find a definitive answer for my issue.

I recently purchased a 90K 2001 GT-S that is having cam gear issues. (1-2 second rattle on start after the car has been sitting for awhile. The noise is completely random, sometimes it'll happen when its been sitting for a night, sometimes it wont happen after several days.)

The knocking I am experiencing is after the car has fully warmed up and been driven for a good 30 minutes or so, makes the car sound like a diesel. The noise definitely sounds like its coming from the left side of the engine which makes me believe its due to low oil pressure and a worn camgear lockpin. (The car sounds completely fine until its fully warmed up, minus the random camgear rattle on starts)

The previous owner changed out the oil before selling it to me, probably with some cheap non-synthetic oil because i found a slight oil leak coming from the valve cover. I'm guessing if i get a new valve gasket cover, new camgear, and do a full tune-up / service including a flush & good oil will fix this issue... or at least that's where i'll start.

I'll try and get a video tomorrow when it stops raining. I already had a mechanic inspect the engine and said the cam/bearings are completely fine.
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Old 05-15-2017, 04:49 PM   #2
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Worn lockpin sounds right for the startup rattle. You should also check/clean the VVT oil screen.

There are too many possibilities for the knock. But, you might check the belt tensioner.
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Old 05-16-2017, 07:27 PM   #3
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Turns out my engine was a lot leakier than I had originally thought, previous owner used putty sealer instead of gaskets.

I'm willing to bet everything will be back to normal after scraping all that crap off and replacing it with real gaskets because at the moment that's all that looks to be wrong with it.

Going to try and clean out everything else in the process.

Last edited by Malango; 05-16-2017 at 07:39 PM..
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Old 05-17-2017, 06:10 AM   #4
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I suggest you install a calibrated oil pressure gauge instead of the simple sender unit and see what the actual oil pressure is showing when cold and hot (and at idle and above 2500 rpm.)
If the previous owner was bastardizing rubber engine gaskets, there may be a more significant reason for the noise (like a rod bearing in trouble.)
My 2 cents.
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Old 05-17-2017, 03:33 PM   #5
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Found the knock, my cam shafts are worn. Bearings are fine. Think i'm just gonna plug the leak and install a new camgear for now, and buy a stage 2 kit from monkeywrench later.
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Old 05-18-2017, 05:44 AM   #6
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Good luck with the repair! Let us know how it turns out.
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Old 05-19-2017, 11:15 AM   #7
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I plugged the leak, flushed the car and put some good oil in it with a new intake camgear, can't hear the knock anymore.

The wear was only on the intake shaft and was minimal, I probably can put off the cam swap for awhile.
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Old Yesterday, 06:01 PM   #8
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Good to know this was resolved. I'm not on here as often as before.
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