Cold start noise
01-25-2008, 03:48 PM
#16
OK I am gettin really confused about this whole exhaust issue...When I start my car cold it rumbles louder and is pretty throaty for about 15-20 seconds and then it calms down and becomes normal but are you guys sure this isn't normal? Are people actually getting replaced mufflers out of this and cold starts are getting quieter?
So let me get this straight - with a "perfect" muffler does that mean that after our cars are left in the cold overnight (in currently 15-25 degree Northern weather) and we start her up the next day - the 1st 15 seconds or so should NOT be louder at all? I thought it was natural...! What's the truth on this? Maybe Jason@Riverside could shed some light as to how our stock mufflers are designed and supposed to behave on a cold start.....
So let me get this straight - with a "perfect" muffler does that mean that after our cars are left in the cold overnight (in currently 15-25 degree Northern weather) and we start her up the next day - the 1st 15 seconds or so should NOT be louder at all? I thought it was natural...! What's the truth on this? Maybe Jason@Riverside could shed some light as to how our stock mufflers are designed and supposed to behave on a cold start.....
01-25-2008, 04:08 PM
#17
ahhh interesting. I get it. So the cold start throaty rumble for 15-20 secs when turning her on is normal but many of you are experiencing a metal clanging/rattle every second the car is on? But I thought some of you were mentioning it goes away when the car warms....? Or does it just get better?
Anyhow I dunno why this exhaust thing is happening in some cars....I wonder if Im not driving my car hard enough to get it lol. Cause if mine is in remission I want it to come out so I can fix on warranty...
Anyhow I dunno why this exhaust thing is happening in some cars....I wonder if Im not driving my car hard enough to get it lol. Cause if mine is in remission I want it to come out so I can fix on warranty...
01-25-2008, 04:14 PM
#18
ahhh interesting. I get it. So the cold start throaty rumble for 15-20 secs when turning her on is normal but many of you are experiencing a metal clanging/rattle every second the car is on? But I thought some of you were mentioning it goes away when the car warms....? Or does it just get better?
Anyhow I dunno why this exhaust thing is happening in some cars....I wonder if Im not driving my car hard enough to get it lol. Cause if mine is in remission I want it to come out so I can fix on warranty...
Anyhow I dunno why this exhaust thing is happening in some cars....I wonder if Im not driving my car hard enough to get it lol. Cause if mine is in remission I want it to come out so I can fix on warranty...
01-25-2008, 05:01 PM
#19
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Throaty Rumble Normal
Joe,
the throaty rumble and roar is normal, I had a horrible crappy tinny noise that also went away like the throaty rumble. the master tech said he'd had a few in and it was a baffle issue. BTW I love the throaty rumble!
the throaty rumble and roar is normal, I had a horrible crappy tinny noise that also went away like the throaty rumble. the master tech said he'd had a few in and it was a baffle issue. BTW I love the throaty rumble!
01-28-2008, 12:12 AM
#22
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I was wondering if anybody else has seen this with their G37. When I start my car in the morning (especially on a rare cold So. Florida morning), my car make a nasty (valve?) rattle noise for the first 20-30 seconds. I have no idea what it is but it is definitely in the engine area. I tried to blip to throttle from 1k to 2.5k rpm's and it almost stalled while making this noise. It's really pissing me off now. After the car warms a bit, it goes away. I took it to the dealer and they could not duplicate. I'm going to record it when its cold one morning to prove it to them. Please chime in, because I'm at a loss here. The guys in 08' Altima's seen to have the same crap as well (I don't know if it applies b/c our motors are slightly different)...
http://forums.nicoclub.com/zerothrea...postid=3075759
Let me know what you think.
JK
http://forums.nicoclub.com/zerothrea...postid=3075759
Let me know what you think.
JK
Ok, just checked and they are hydraulic lifters. Notorious for some early startup rattle noise. Have heard them so bad that you would swear you had rod knock.
Last edited by dillyyo; 01-28-2008 at 12:36 AM.
03-04-2008, 11:36 AM
#23
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I think i was one of the first, if not the first on these boards to have this issue.
Got the muffler replaced, problem was corrected. Now... a good few months later the horrible sound is starting to return. Gonna nip it in the bud this time and call them right away.
>_<
At this rate i should just ask for an aftermarket axleback exhaust, or the optional one they get over in Japan for the 370 GT
Got the muffler replaced, problem was corrected. Now... a good few months later the horrible sound is starting to return. Gonna nip it in the bud this time and call them right away.
>_<
At this rate i should just ask for an aftermarket axleback exhaust, or the optional one they get over in Japan for the 370 GT
MMMM RACE GAS!
03-06-2008, 12:43 AM
#28
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Sounds like one of 2 things: piston slap or 'collapsed' lifters, since they're hydraulic indeed. It's very hard to tell them apart: same rhythmic (and loud as heck) 'clak, clak, clak', but lifters 'pump up' rather quickly, whereas piston slap usually takes 10 to 20 seconds to go away, as piston(s) heat up and expand. The good news is neither one reportedly causes any damage, even in the long run. My F150 had piston slap, and Ford offered to rebuild my engine at no cost, but I refused since it happened just a few times a year.
My '06 LS2 GTO had that nasty noise twice when new (there were 4 clacks each time), but it didn't happen this winter, even though it was colder. And yes, these engines are legendary for piston slap, but I don't think mine has it due to the fact it doesn't go away (AFAIK). But I'd gladly trade 10 or 20 seconds of noise for the constant hot valve clatter of this engine. Heavier oil helped (5/40 vs 5/30, due to mild winters and brutal summers), but it's still there.
I can't stand engine noises either, but after listening a cold G37 sound very 'unflattering' as well, am getting used to them before I go nuts. Good luck.
JC
My '06 LS2 GTO had that nasty noise twice when new (there were 4 clacks each time), but it didn't happen this winter, even though it was colder. And yes, these engines are legendary for piston slap, but I don't think mine has it due to the fact it doesn't go away (AFAIK). But I'd gladly trade 10 or 20 seconds of noise for the constant hot valve clatter of this engine. Heavier oil helped (5/40 vs 5/30, due to mild winters and brutal summers), but it's still there.
I can't stand engine noises either, but after listening a cold G37 sound very 'unflattering' as well, am getting used to them before I go nuts. Good luck.
JC
03-06-2008, 11:02 AM
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Sounds like one of 2 things: piston slap or 'collapsed' lifters, since they're hydraulic indeed. It's very hard to tell them apart: same rhythmic (and loud as heck) 'clak, clak, clak', but lifters 'pump up' rather quickly, whereas piston slap usually takes 10 to 20 seconds to go away, as piston(s) heat up and expand. The good news is neither one reportedly causes any damage, even in the long run. My F150 had piston slap, and Ford offered to rebuild my engine at no cost, but I refused since it happened just a few times a year.
My '06 LS2 GTO had that nasty noise twice when new (there were 4 clacks each time), but it didn't happen this winter, even though it was colder. And yes, these engines are legendary for piston slap, but I don't think mine has it due to the fact it doesn't go away (AFAIK). But I'd gladly trade 10 or 20 seconds of noise for the constant hot valve clatter of this engine. Heavier oil helped (5/40 vs 5/30, due to mild winters and brutal summers), but it's still there.
I can't stand engine noises either, but after listening a cold G37 sound very 'unflattering' as well, am getting used to them before I go nuts. Good luck.
JC
My '06 LS2 GTO had that nasty noise twice when new (there were 4 clacks each time), but it didn't happen this winter, even though it was colder. And yes, these engines are legendary for piston slap, but I don't think mine has it due to the fact it doesn't go away (AFAIK). But I'd gladly trade 10 or 20 seconds of noise for the constant hot valve clatter of this engine. Heavier oil helped (5/40 vs 5/30, due to mild winters and brutal summers), but it's still there.
I can't stand engine noises either, but after listening a cold G37 sound very 'unflattering' as well, am getting used to them before I go nuts. Good luck.
JC
I also had the muffler rattle issue and had it replaced. That took care of the tin can in a garbage disposal noise issue but not the cold startup noise.
Overall though, I'm still happy with my car. It's a blast to drive.
