Loud Idling when first start vehicle

Forum for Infiniti M37, M56 M35h Hybrid and Q70 owners.
Mrtrini868
Posts: 1
Joined: Thu Aug 30, 2018 5:03 pm
Car: 2015 INFINITI Q70 GREY

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Hey Folks! I have a 2015 Infiniti Q70 with almost 29,000 miles. A few days ago I started my car and while idling it started making a loud noise, but after I move the car and park, the idling noise is no longer there. My issue now is that every time I start the vehicle after it sit off for a period of time, it continue to have the idling noise after starting and then disappear after moving.

I will appreciate if anyone can give their input.

thanks


JCesar
Posts: 170
Joined: Thu Apr 09, 2015 7:12 am

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that's normal. it's a cold start. any car sounds louder at first then your idle goes no normal rpm

crrraaig
Posts: 29
Joined: Tue Jul 02, 2019 1:41 pm
Car: 2012 Infiniti M37x
2011 BMW x5 xDrive35i
2006 BMW 330xi
1999 Mazda Miata MX-5
1990 Ford Taurus SHO
1973 Norton Commando 750
1972 Triumph Bonneville 750
1966 Volvo 1800S
Location: State College, PA
Contact:

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I agree that the cold start is normal and louder, but it should have always been there. If this is a new loud startup noise that has not been there before, it could be a loose heat shield, which I have had and it seems others here have also had issue with. Mine went away after 28k miles ;)

From where does this sound cometh?

agoodall
Posts: 102
Joined: Thu Apr 10, 2014 8:37 am
Car: 2011 M37x
Location: West Chester, PA

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pin holes in Y-pipe?

satown210
Posts: 212
Joined: Sat Jan 25, 2014 2:10 am
Car: 2012 Infiniti M37
2005 Nissan Xterra Off Road

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It is normal. The computer advances the exhaust timing to an extreme degree during cold startup to help heat up the catalytic converters faster. It's an emission thing.

mikedamageinc
Posts: 138
Joined: Sun Feb 14, 2016 5:56 am
Car: 2012 M37x Touring
1999 Camaro SS
1997 Toyota Land Cruiser
2008 Yukon Denali

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Does it sound like an exhaust leak? That's normal and other cars do it too, like it was said, variable timing making different noises. You probably didn't notice it before. I hate it but my wife doesn't even notice it.


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