Another Idle Issue? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

amacadam · 11-03-2014, 11:49 PM

Hey guys this is my first post here, I wanted ask if any of you had experienced this idle issue I have just noticed. (I couldn't find any other threads about it)
So on a cold start I've noticed a knocking sound coming from the engine. It's only happened two or three times but it is definitely noticeable. And it is a manual trans.
So I start the car and it sits at 1700rpm and makes this knocking sound. The tachometer bounces up and down slightly for a little before slowly sinking to 700rpms, and when it bounces up and down I can feel the engine hesitating while i'm in the car.
No difference is made if I engage the clutch or not.
Have any of you guys had this issue/know what to do? Is this just the boxer rumble? Im used to old Honda engines and have never owned a Subaru.
I found a video on youtube that is the same thing my car is doing (my video didnt turn out so great) so I will try and attach it.
Thanks in advance!
[ame="http://www.youtube.com/watch?v=47Vncoc4QdM"]Cold idle issue FR-S - YouTube[/ame]

ZZT86 · 11-04-2014, 05:35 AM

Popping from the exhaust caused by cold start emissions which was deemed normal engine operation iirc.

11-03-2014, 11:49 PM	#1
amacadam Junior Member Join Date: Nov 2014 Drives: Red Rocket Location: Cocoa FL Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Another Idle Issue? Hey guys this is my first post here, I wanted ask if any of you had experienced this idle issue I have just noticed. (I couldn't find any other threads about it) So on a cold start I've noticed a knocking sound coming from the engine. It's only happened two or three times but it is definitely noticeable. And it is a manual trans. So I start the car and it sits at 1700rpm and makes this knocking sound. The tachometer bounces up and down slightly for a little before slowly sinking to 700rpms, and when it bounces up and down I can feel the engine hesitating while i'm in the car. No difference is made if I engage the clutch or not. Have any of you guys had this issue/know what to do? Is this just the boxer rumble? Im used to old Honda engines and have never owned a Subaru. I found a video on youtube that is the same thing my car is doing (my video didnt turn out so great) so I will try and attach it. Thanks in advance! [ame="http://www.youtube.com/watch?v=47Vncoc4QdM"]Cold idle issue FR-S - YouTube[/ame]

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11-04-2014, 05:35 AM	#2
ZZT86 Senior Member Join Date: Jul 2012 Drives: BR86 Location: Location Posts: 841 Thanks: 310 Thanked 146 Times in 114 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Popping from the exhaust caused by cold start emissions which was deemed normal engine operation iirc.

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