Knocking/Rattle on start up.

[Mr.EvoMR]

Same here, morning time comes, i start it, it makes a surprisingly loud popping/knocking noise then a few less noticeable ones and after warm up it runs fine...never happend while driving or at a stop

[Rayme]

I'd like to give an update on MY noises. Last winter I had some popping noise on very cold morning starts, backfire type noise coming from the engine area and not exhaust. It was only in very cold temps (-15 and under), never did anything / went to the dealer about it.

However, this winter #2 has been extremely cold, and I never hear that noise anymore. The thing fixed itself.

[OrbitalEllipses]

Originally Posted by Rayme

I'd like to give an update on MY noises. Last winter I had some popping noise on very cold morning starts, backfire type noise coming from the engine area and not exhaust. It was only in very cold temps (-15 and under), never did anything / went to the dealer about it.

However, this winter #2 has been extremely cold, and I never hear that noise anymore. The thing fixed itself.

I had some popping of this type last winter. This winter I've heard pops on startup maybe twice.


Our posts next winter: engine gave up the ghost LOL.

[Poodles]

Originally Posted by Suberman

If you fit a cold air intake you will experience problems in cold weather. If cold air intakes actually worked then manufacturers would install them. They don't work and they don't.

The stock setup is a cold air intake... yes they use them and no they don't "cause problems" in cold weather (this was only true back on carbed engines)

Originally Posted by GarageBRZTuning

I recently installed a K&N Cold Air Intake in my BRZ and noticed the same problem on a cold start-up. My car only has 1300 miles and on it and I honestly thought it was the intake.. After taking the intake out and putting the OEM Intake in the problem didn't go away... If anything the noise actually got quieter. I'm taking it the the dealership in a couple of weeks and seeing if they know what's wrong with it! Glad to know I"m not the only one that experienced this problem. Thanks for letting me know I'm not going insane!!

K&N is less of a cold air intake than the stock setup.


Most cars do stuff like this on a cold startup, it's completely normal and there are various reasons for it. If it doesn't go away once it's warmed up, then you have a major issue.

[jimbobrand]

Originally Posted by Cjymiller

Any update with the knocking in the morning? What did the dealer say?

I don't think they even checked but it hasn't happened again and it has been colder since it first happened. My biggest concern is that they dented my fenders when they were replacing the leaking cam cover