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, 08:58 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, 04:06 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, 04:38 AM   #3
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get to the choppa!
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Old 07-13-2017, 05:24 AM   #4
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Old 07-13-2017, 06:54 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, 09:31 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, 03:59 PM   #7
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Quote:
Originally Posted by Conway_160 View Post
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, 04:11 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, 06:04 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, 07:10 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, 01:32 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, 02:59 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, 03:06 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, 04:54 AM   #14
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Still sounds like my diesel.
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