Engine chirp when first giving gas
03-04-2018, 05:15 PM
#1
Melting Slicks
Thread Starter
Member Since: Dec 2006
Location: Orange County California
Posts: 2,249
Received 90 Likes
on
71 Posts
Engine chirp when first giving gas
What causes that "chirp" in the engine when starting out from a stop? If you're in neutral, also, and just pop the revs a bit, it chirps. I figure it's normal but don't know what it is.
Last edited by IAIA; 03-04-2018 at 05:16 PM.
03-04-2018, 06:57 PM
#2
Le Mans Master
The rush of air in the intake can sound like a chirp at times. Not sure if this is what you're hearing.
03-04-2018, 09:36 PM
#7
Melting Slicks
I get sort of a very brief rasping sound on throttle opening that sounds like air rushing past the throttle valve... Been present since new, and consider it a normal event...
The following users liked this post:
beaversstonehaven (03-06-2018)
03-04-2018, 11:21 PM
#8
It's totally normal. The same sound occurred on my 14 and newly-delivered 18. It is a rush of air sucked in when the throttle body opens.
03-05-2018, 10:10 AM
#9
Melting Slicks
Thread Starter
Member Since: Dec 2006
Location: Orange County California
Posts: 2,249
Received 90 Likes
on
71 Posts
Rasping air when the throttle body first opens sounds right. It's a '17 GS so I'm hoping they got rid of the tensioner pulley issue by now! Thanks for the feedback.
The following users liked this post:
Red Alert (03-06-2018)
03-05-2018, 09:21 PM
#11
Racer
My C7 had a chirp and it was the tensioner pulley and fixed under a TSB I believe.
My C6 had a chirp and it was the harmonic balancer issue that was common to them.
My C6 had a chirp and it was the harmonic balancer issue that was common to them.
03-05-2018, 11:14 PM
#12
I think the problem here is the use of the term, "chirp." I don't think that's actually the sound being described here.
03-06-2018, 03:35 AM
#13
Melting Slicks
Thread Starter
Member Since: Dec 2006
Location: Orange County California
Posts: 2,249
Received 90 Likes
on
71 Posts
You're correct, but it's the best I could come up with at the time. Thinking about it more, it's a very short, raspy, mid-frequency sound. Air rushing comes to mind but it initially has a grittier/rougher-type aspect to it for a split second, and more than what you would normally consider as air rushing in...no doubt caused by revs as the engine engages. I'll try to post some audio sometime this week. The opening throttle body explanation makes the most sense to me.