Rough and noisy at startup
#1
Rough and noisy at startup
My G37S has barely 1,000 miles, and I've noticed that it is noisy and has a lot of vibration for about 30 seconds after startup. Is this a normal characteristic of the engine? The cabin noticeably vibrates until the car settles down after starting.
I also notice what sounds like a valve rattle coming from the engine at startup, but I understand that this engine tends to be loud.
I also notice what sounds like a valve rattle coming from the engine at startup, but I understand that this engine tends to be loud.
#4
My G37xS does it too, just passed 600 miles. It does it in the warm garage and outside. I plan on asking the dealer during first service. I have noticed many others posting about valve noise. Other than that, the engine seems to run very well.
#7
Sounds like this is a normal characteristic for this engine. Can anyone chime in that's past break-in? Does this continue?
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#12
I actually noticed my car (2010 G37xS Sedan) do that for the first time today. I don't know how "loud" or "shaky" it was, but the RPM's seemed to jump up over 2000 for like 15-20 seconds and then fall back down. It's got 320 miles and is 2 weeks old.
#15
Registered User
I disagree. It's not normal. If anyone hears noise on startup that sounds
like metal-to-metal; that's exactly what it is. Metal-to-metal means
parts are not lubricated adequately and if they are making an unmistakable
metal-to-metal sound, they are wearing substantially
in ways never intended....period. "dry" parts at startup should
not last longer than 5, 10 seconds at most and can usually be
cured with the right oil. Noise as described for longer than
5-10 seconds are often an indication of other issues such
as bad oil pump, clogged filter, clogged or choked lines, bad lifter
stretched or bad timing chain, parking on a incline, or even valve deposits
from bad gas or engine lugging from driving in too high a gear too
often. Another possible issue that the VQ37 is prone too, is
sheared oil won't let the VVEL actuator motor build up
pressure fast enough which can lead to actuator failure....or worse.
My dealer says...."they all do it".....I say BS, Mine doesn't
even when it's 10 below zero! I also know of several others
that don't and several that do.
like metal-to-metal; that's exactly what it is. Metal-to-metal means
parts are not lubricated adequately and if they are making an unmistakable
metal-to-metal sound, they are wearing substantially
in ways never intended....period. "dry" parts at startup should
not last longer than 5, 10 seconds at most and can usually be
cured with the right oil. Noise as described for longer than
5-10 seconds are often an indication of other issues such
as bad oil pump, clogged filter, clogged or choked lines, bad lifter
stretched or bad timing chain, parking on a incline, or even valve deposits
from bad gas or engine lugging from driving in too high a gear too
often. Another possible issue that the VQ37 is prone too, is
sheared oil won't let the VVEL actuator motor build up
pressure fast enough which can lead to actuator failure....or worse.
My dealer says...."they all do it".....I say BS, Mine doesn't
even when it's 10 below zero! I also know of several others
that don't and several that do.