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Old 05-28-2013, 11:49 PM   #21
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Dont think it is your chain tensioner. All it is is a plastic guide pushed agsinst the chain.
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Old 05-29-2013, 08:00 AM   #22
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Its got a bearing bolt. If its worn down? Then as car is running oil gets on it and noose goes away... Idk just ideas. Ill just have to get in there one of these weekends

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Old 05-29-2013, 09:40 AM   #23
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piston slap? I doubt it but just a thought.
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Old 05-29-2013, 01:06 PM   #24
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I have the same knock. Only present during cold start up. Noticed it 5k miles ago..
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Old 05-29-2013, 01:11 PM   #25
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Maybe rocker arm or worn down cam?
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Old 05-29-2013, 01:49 PM   #26
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No its not coming from head. Diffently the block. Its 99 percent positive its something to do with oil pump and its components.

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Old 05-29-2013, 02:03 PM   #27
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Ive personally had this noise for years and about 30k miles.

Its not bearings as motor and crank would be toast by now. Its not vanos because its all been rebuilt. Not cam or rocker. Those would cause driving problems and wouldn't go away. Its not piston slap because that wouldnt go away after warm. My oil pressure has never been a problem and i don't see a pump noise going away after warm either. Its not water pump ac or steering gear timing vales or anything
In the head. Stethoscope points directly to oil pump/chain area.

Unlike the timing chain the oil pump chain is single, I've seen single timing change stretch before on other cars. And they tighten up when they get hot enough to make any noise they made go away. Oil is not fed to the oil pump chain tension bearing bolt. Its get it from gravity from oil in head falling down. Timing chain area. If my car is all the way hot and I turn it off for thirty minutes and start it, the noise is there again for a few minutes even thou its already operating temp. So whatever oil is on tension bearing bolt has run off I'm thinking. Of course is worse when car is all the way cold.




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Old 06-11-2013, 12:05 PM   #28
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mysterious knocking

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Originally Posted by InDiGlOM3 View Post
Ive personally had this noise for years and about 30k miles.

Its not bearings as motor and crank would be toast by now. Its not vanos because its all been rebuilt. Not cam or rocker. Those would cause driving problems and wouldn't go away. Its not piston slap because that wouldnt go away after warm. My oil pressure has never been a problem and i don't see a pump noise going away after warm either. Its not water pump ac or steering gear timing vales or anything
In the head. Stethoscope points directly to oil pump/chain area.

Unlike the timing chain the oil pump chain is single, I've seen single timing change stretch before on other cars. And they tighten up when they get hot enough to make any noise they made go away. Oil is not fed to the oil pump chain tension bearing bolt. Its get it from gravity from oil in head falling down. Timing chain area. If my car is all the way hot and I turn it off for thirty minutes and start it, the noise is there again for a few minutes even thou its already operating temp. So whatever oil is on tension bearing bolt has run off I'm thinking. Of course is worse when car is all the way cold.




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Just an idea and long shot... Idle control valve "rocking back and forth??? I think that would effect ur idle rpm so if that's ok now it's probably something else... Maybe belt tensioner ???.


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Old 06-11-2013, 02:08 PM   #29
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mysterious knocking

I take my ride today to my dads shop and in my case it looks like lifter are the one with problem, i order then already to see if i fix it! Also went to dealer and they said lifter on our car is a common failing part and could make a noise at start in different areas and make you think is something else.
If you have misfiring code at start, you should give a look to this too. Good luck


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Old 06-11-2013, 02:18 PM   #30
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I'll check them for the hell of it but my idle is perfect now and i dont misfire etc. Hard to fool me with a stethoscope for where noise is coming from, its what I do everyday when dynoing engines

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Old 06-11-2013, 02:36 PM   #31
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Yes i did have to take it because mines did it before every time i start it i got that noise with misfiring and after 10sec i goes away, and one day i put seafoam in my engine and i did went away for around 3 weeks, so i though my problem was done but it came back around 2 weeks already and i did take it to see what was it, and we discover this, once at dealer told me could be my oil pump, but it wasn't, its my lifter that are not keeping the oil


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Old 06-11-2013, 05:02 PM   #32
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mysterious knocking

From what I have been told, the noise may be the lifters upon cold start and considered normal operating conditions. Especially with the hydraulic lifters on the m5x engines. The lifters take a short time to prime and make noise until fully primed. Once the engine is stopped, they start losing the prime and will make noise upon startup until primed again.

The only solution is to replace lifters and even then it may not fix the noise.


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Old 06-11-2013, 07:53 PM   #33
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Re: mysterious knocking

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From what I have been told, the noise may be the lifters upon cold start and considered normal operating conditions. Especially with the hydraulic lifters on the m5x engines. The lifters take a short time to prime and make noise until fully primed. Once the engine is stopped, they start losing the prime and will make noise upon startup until primed again.

The only solution is to replace lifters and even then it may not fix the noise.


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Yeah its completly different for the s54. No hydro lifters

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Old 06-14-2013, 10:24 AM   #34
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Re: mysterious knocking

Car is up and pan coming off after work, wonder what ill find.

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Old 06-14-2013, 11:34 AM   #35
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mysterious knocking

Keep us posted


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Old 06-14-2013, 12:00 PM   #36
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rocker arm is all that I can think of, I've had this problem with other vehicles. when cold it you will get a slight knock. but when they get warmed up they start working properly and knock goes away.

I see you already dismissed that because of the stethoscope, good luck finding the problem and please post the solution when you find it.
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Old 06-14-2013, 09:43 PM   #37
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Re: mysterious knocking

Well I found the problem. as I though. chain is really loose. tensioner is crap, so when its cold is when its the most loose and no oil on it really and its hitting one of the hard lines to the pump, pretty good gouge growing on it. Ill take pictures soon and a little video to show how bad it is. What's BS I had this problem before my motor got built. I forgot to mention it and they put it back together like this, something easily noticed. or should of been.

I also found a broken oil sprayer in my pan. I have not looked to see if one is missing. might of been from when my motor first went boom.

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Old 06-14-2013, 11:50 PM   #38
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mysterious knocking

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Well I found the problem. as I though. chain is really loose. tensioner is crap, so when its cold is when its the most loose and no oil on it really and its hitting one of the hard lines to the pump, pretty good gouge growing on it. Ill take pictures soon and a little video to show how bad it is. What's BS I had this problem before my motor got built. I forgot to mention it and they put it back together like this, something easily noticed. or should of been.

I also found a broken oil sprayer in my pan. I have not looked to see if one is missing. might of been from when my motor first went boom.

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So was this the timing chain and guide? If so how many miles on chain?


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Old 06-15-2013, 02:39 AM   #39
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Re: mysterious knocking

No just oil pump chain. its a small single chain that's just for the oil pump

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Old 06-15-2013, 02:20 PM   #40
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Well I found the problem. as I though. chain is really loose. tensioner is crap, so when its cold is when its the most loose and no oil on it really and its hitting one of the hard lines to the pump, pretty good gouge growing on it. Ill take pictures soon and a little video to show how bad it is. What's BS I had this problem before my motor got built. I forgot to mention it and they put it back together like this, something easily noticed. or should of been.

I also found a broken oil sprayer in my pan. I have not looked to see if one is missing. might of been from when my motor first went boom.

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Ah this was a problem with the earlier version of built engines...iirc piston design and oil squirters were revised a long time ago. As for the chain...normal wear you figure? I know they put a new chain in with my built engine.
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