Why does my 2003 350Z VQ35DE engine sound like this? - MY350Z.COM - Nissan 350Z and 370Z Forum Discussion



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Old 07-12-2017, 09:58 PM   #1
mforno
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Default Why does my 2003 350Z VQ35DE engine sound like this?

My engine sounds bad but runs fine. It kind of sounds like a diesel engine at the moment. Here is a short video I took where you can listen to the sound and see what you all think what might be the cause.
Any help is much appreciated.
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Old 07-13-2017, 05:06 AM   #2
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Sounds like some very noisy lifters or injectors, is it rpm dependant?
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Old 07-13-2017, 05:38 AM   #3
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get to the choppa!
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Old 07-13-2017, 06:24 AM   #4
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Old 07-13-2017, 07:54 PM   #5
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Hahahahaha yes guys it doe's sound a lot like a helicopter!

It is RPM dependent, it is low on oil pressure and the RPM is low enough to conk out at the traffic lights now and then. I was putting E10 ethanol fuel in the car and then changed back to 95 premium and there is a huge difference in power and sound but it still makes the noise in low gears and in park.
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Old 07-14-2017, 10:31 AM   #6
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Well if you was running crap gas for a while you prolly messed up the motor with detonation.
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Old 07-14-2017, 04:59 PM   #7
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Quote:
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Well if you was running crap gas for a while you prolly messed up the motor with detonation.
so how do I fix it?
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Old 07-14-2017, 05:11 PM   #8
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Do a compression test.. Were you beating on it prior to this happening?..
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Old 07-14-2017, 07:04 PM   #9
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You need to do a compression test and a leak down.
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Old 07-14-2017, 08:10 PM   #10
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Quote:
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You need to do a compression test and a leak down.
Carried out compression test - all cylinders even (160-170psi) apart for no.5 at 100 psi
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Old 07-15-2017, 02:32 PM   #11
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Looks like you've found the problem. None of them should be below the minimum of 142psi. Pour 1 teaspoon of engine oil into that plug hole and retest. If the reading jumps, the piston rings are worn. If not, think valve problems. Do the test with the engine warm also.
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Old 07-15-2017, 03:59 PM   #12
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Quote:
Originally Posted by Atreyu'z 350 View Post
Looks like you've found the problem. None of them should be below the minimum of 142psi. Pour 1 teaspoon of engine oil into that plug hole and retest. If the reading jumps, the piston rings are worn. If not, think valve problems. Do the test with the engine warm also.
Thank's for that extra tip. I heard also that the fuel damper/regulator could be the cause of the noise. Will continue looking into it.
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Old 07-15-2017, 04:06 PM   #13
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UPDATE: I after putting in 95 Premium fuel the engine does sound a little better than before but still had an initial loud rough ignition startup. But alteast it doesnt sound so much like a helicopter taking off lol
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Old 07-17-2017, 05:54 AM   #14
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Still sounds like my diesel.
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Old 01-01-2018, 04:05 PM   #15
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Hey there my engine has been doing the same thing, it used to only happen on cold start up and last a few seconds now it rattles all the time.

i finally took it to nissan with my own idea of what it could be and yes as i thought its the timing chain.

now Nissan is quoting $4800 to change the chains, guides and tensioner.
first time they have ever seen it in a 350z haha
Or im waiting on a price for dropping a second hand engine in it.
Hopfully this is not the case for you but if it is and you still run the car and skip a tooth your engine will be destroyed
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Old 01-01-2018, 04:06 PM   #16
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Quote:
Originally Posted by Cler1c View Post
Hey there my engine has been doing the same thing, it used to only happen on cold start up and last a few seconds now it rattles all the time.

i finally took it to nissan with my own idea of what it could be and yes as i thought its the timing chain.

now Nissan is quoting $4800 to change the chains, guides and tensioner.
first time they have ever seen it in a 350z haha
Or im waiting on a price for dropping a second hand engine in it.
Hopfully this is not the case for you but if it is and you still run the car and skip a tooth your engine will be destroyed
did you happen to get it fixed?
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Old 01-02-2018, 07:51 PM   #17
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What side of the engine is doing this?

Mine LITERALLY started doing this this morning randomly at idle. Mine is coming from the left or driver side in the front of the engine.

I'm taking mine to the mechanic tomorrow. At first I thought it was a rod or bearing, but I had the car tuned to make 440hp today. It ran and did pulls just fine. I started to think the water pump self destructed. But now like above I'm starting to think it's the timing chain and IIRC Nissan decided to use a plastic chain guide that is prone to breaking off and clacking when this happens.


So for now I'm going to assume my driver side chain tensioner is blown. You guys should get your timing guides and tensioner look at.
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Old 01-02-2018, 08:09 PM   #18
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The sound is coming from the front driver side.
if you want to just try replacing the tensioner apparantly its pretty easy to do by removing the small black cover in the front of the engine

unfortunately i think my chain is stretched but Nissan won't just replace the tensioner... they want to inspect the lot which means pulling off the entire timing cover

ive got a video of what mine sounds like i just dont know how to uploead it
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Old 01-02-2018, 08:10 PM   #19
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The sound is coming from the front driver side.
if you want to just try replacing the tensioner apparantly its pretty easy to do by removing the small black cover in the front of the engine

unfortunately i think my chain is stretched but Nissan won't just replace the tensioner... they want to inspect the lot which means pulling off the entire timing cover

ive got a video of what mine sounds like i just dont know how to uploead it
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Old 01-02-2018, 11:03 PM   #20
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You tube
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