Startup Sound - Missing?
Thread Starter
Racer
Joined: Aug 2009
Posts: 457
Likes: 149
From: Katy, TX
Startup Sound - Missing?
When I cold start my 2016 Z51, it almost sounds like it's missing? It only happens on cold start, then after about 20-30s it goes away. It happened recently.
Thanks!
Thanks!
Thread Starter
Racer
Joined: Aug 2009
Posts: 457
Likes: 149
From: Katy, TX
Drifting
Joined: Apr 2022
Posts: 1,856
Likes: 792
From: Earth
Thread Starter
Racer
Joined: Aug 2009
Posts: 457
Likes: 149
From: Katy, TX
Seems to be running fine, I have NPP in track mode. After the first cold start of the day, roughly 20s after, it mellows out. It sounds like the cadence is off at first. I’ll grab a longer video tomorrow, because I’m explaining it poorly.
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Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,476
From: South Florida
I can hear the miss in that video. That doesn't sound normal to me. Have you started with the simple things? Plugs and wires?
The tone change after about 20 seconds due to cat warmup mode which pulls timing to heat up the catalytic converters. But, yeah, to me that startup sounds a little off.
The tone change after about 20 seconds due to cat warmup mode which pulls timing to heat up the catalytic converters. But, yeah, to me that startup sounds a little off.
Thread Starter
Racer
Joined: Aug 2009
Posts: 457
Likes: 149
From: Katy, TX
I can hear the miss in that video. That doesn't sound normal to me. Have you started with the simple things? Plugs and wires?
The tone change after about 20 seconds due to cat warmup mode which pulls timing to heat up the catalytic converters. But, yeah, to me that startup sounds a little off.
The tone change after about 20 seconds due to cat warmup mode which pulls timing to heat up the catalytic converters. But, yeah, to me that startup sounds a little off.
Hoping it’s not an injector
Thread Starter
Racer
Joined: Aug 2009
Posts: 457
Likes: 149
From: Katy, TX
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,476
From: South Florida
Drifting
Joined: Apr 2022
Posts: 1,856
Likes: 792
From: Earth
If the car runs well at low and high speeds what's the problem? Does it stumble letting out the clutch when cold? What problems as far as drivability are you experiencing? Can it be a slow to open NPP valve/butterfly?
