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birdland1982
Novice
Feb 19, 2015, 1:04 AM
Post #1 of 8
(2725 views)
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2004 Infiniti G35 Noise
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I have a 2004 Inifiniti G35 sedan (3.5L V6) with 120K miles on it.
It has been making a terrible whirring/chugging/rumbling sound (almost like the engine of a semi-truck) when I drive it. The sound is loosely associated with when I depress the accelerator--it gets louder. However, it doesn't stop when I let up on the accelerator, but then gradually dies down.
I posted a video with the noise at:
http://youtu.be/3CD06cbNlao
I am in stop and go traffic, so you can hear the sound come and go.
It has been doing this for several days, after a period where it hadn't been making this noise. I have taken it to two mechanics in the past when this problem arose. The first one wasn't able to diagnose it. The second replaced the accelerator pedal. He also said it has a slow oil leak. Tonight, the oil light came on. I checked the oil level and it looked very low, so I added 3/4 L of oil. I haven't been able drive it since then to see if the problem has gone away.
Can someone tell me if this noise is related to the oil leak, and results from having low oil? Or is this a red herring and the problem is something else entirely?
Thank you in advance for your help!
link repaired
(This post was edited by Hammer Time on Feb 19, 2015, 3:16 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 19, 2015, 1:25 AM
Post #2 of 8
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Re: 2004 Infiniti G35 Noise
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Couldn't make your link to video work yet - always trouble with those unless clickable for me.
Doesn't matter for now. Your oil light came on AND you found oil level low and added some but was it added to filled or just added some? C'mon sport - oil light isn't for entertainment it's fatal for an engine in no time at all to run at all without oil pressure for any reason one of which is low oil level.
You have a warning and possible fatal damage now for that engine. Sorry two techs with it didn't do better at finding the problem or telling you for sure what it even could be,
T
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Discretesignals
Ultimate Carjunky
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Feb 19, 2015, 5:22 AM
Post #3 of 8
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Re: 2004 Infiniti G35 Noise
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Might want to screw in an oil pressure gauge and see what the actual oil pressure is. Sounds like the chains are rattling around possibly due to low oil pressure. Other than for diagnosing the issue, you shouldn't run the engine anymore. It may be too late and will probably be needing another engine, so don't be surprised if that is what it comes down to.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Feb 19, 2015, 5:26 AM)
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Tom Greenleaf
Ultimate Carjunky
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Feb 19, 2015, 5:32 AM
Post #4 of 8
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Re: 2004 Infiniti G35 Noise
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Thanks HT, finally got it. My device wants it to show like this link........
https://www.youtube.com/...amp;feature=youtu.be
Don't ask - I don't know why on that part.
OK - does sound like low oil pressure. Agree with DS that has to be verified mechanically and oil issue resolved if it was way too low or for another reason checked if massive engine damage has already occurred - awful hard to say just the good news for now is it runs at all so there's a chance a repair will do it - not sure without checking on a lot of assorted things,
T
(About links to YouTube) When original shows in my view with an extra {{.}} dot it will not show. I can't be alone that it takes removing that dot and the HTTP// sometimes you get to it or not the issue at all?? If the script can't be typed or copy/pasted as posted here instead of turning purple in my view (hyperlink) it has to be exact. A problem with this site only - why is anyone's guess? Tom
(This post was edited by Tom Greenleaf on Feb 19, 2015, 5:40 AM)
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Discretesignals
Ultimate Carjunky
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Feb 19, 2015, 5:48 AM
Post #5 of 8
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Re: 2004 Infiniti G35 Noise
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They had problems with blowing the rear timing cover paper gasket resulting in low oil pressure, so that is a possibility.
You would have to remove the timing chain cover to see it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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birdland1982
Novice
Feb 20, 2015, 10:20 PM
Post #6 of 8
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Re: 2004 Infiniti G35 Noise
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Thanks, gentlemen. Here's the rest of the story:
I had it towed to a shop today. They added 2 quarts of oil and when they started it they didn't hear any noise. They found two slow leaks: valve covers and rear main seal (this is consistent with what previous techs found). They said not worth it to fix these right now, just recommended checking oil level every month (if not every time I get gas) and add oil as necessary (this is also similar advice to previous techs). Other then that, they said it has a clean bill of health. They think the noise was the timing chain which becomes loose with low levels of oil.
I drove it home and no noise, and car drove very smoothly. Hopefully no more issues.
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Tom Greenleaf
Ultimate Carjunky
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Feb 21, 2015, 12:14 AM
Post #7 of 8
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Re: 2004 Infiniti G35 Noise
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No! DS posted a likely reason - 5 stars for that and most would miss that IMO.
You added almost a qt. then the shop could add 2 more! You were near seize up just on that then for any reason it was that low on oil.
Your tech's suggestions I can't compete with being there but isn't right somewhere. You just don't use up about 3 quarts of oil and not need a repair unless you haven't touched anything for years or something like that maybe and that would be its own problem.
You could buy a case of oil and check it every couple miles and it isn't the answer.
OK - They said rear main seal and valve cover gaskets were seen as leaking. Understood and my experience is frequently by the time an engine really leaks (not just damp at rear main) it's beaten up by a worn crank and engine along with the valve covers leaking suggests excessive blow by and worn engine as well.
Fine, if that's all true and this is now just buying whatever time this engine has left that's fine and AYOR but would want to know for sure better that those who checked it in person suggested.
I will not argue with checking oil every time you get fuel and not waiting for warning of either low oil and check it or the death warning of oil pressure below spec - those frequently too late when they do come on properly!
Hey it's your car and money but sounds like you have a chance with saving this engine and it's really not sure to me it's ready to just buy time till it croaks!
Just you should be well informed of risks of the advice you were told and fine with me if you are ready to give up on this engine or whole car just know that are are rolling the dice every time you drive it IMO,
T
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Discretesignals
Ultimate Carjunky
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Feb 21, 2015, 10:56 AM
Post #8 of 8
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Re: 2004 Infiniti G35 Noise
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Might want to at least check the oil pressure on that and have the valve covers resealed. You really think the wife is going to check the oil level on that every time she goes for a drive? LOL
The mechs don't want to do it because they want to wait and see if the engine blows up or shows any signs of mechanical problems. Or they are like me and hate working on Nissans...
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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