Click sound on cold start
 

Hey guys, been having this loud click sound on cold starts, usually when it has sat for a day or so. Car is driving fine otherwise at around 50k miles. Any ideas what this could be? 2017 BRZ 6MT https://youtu.be/kN5ykdmZP0I

Welcome to the forum, there, aphexgt - :clap:

I have no idea what is causing that sound, but I wouldn't worry about it unless it gets worse.

Is your car an AT or MT?

Do you have any power mods?

Thanks! Coming from a chevy spark so real excited to finally have something I enjoy, and its an MT that's entirely stock !

Does it have automatic door locks?

I'm not hearing any loud clicks even with headphones. I hear the normal sound of the steering lock retracting, a normal cranking sound, a normal rev up, a normal chime, I hear the engine stumbling and picking back up, then it goes back to running normally with a normal sound, no clicks.

it would do that if he let out the clutch after starting, but leaving the transmission in neutral. mine does the same thing, but it's more a driver-mod than a car-mod.

i will start it, let off the clutch, it stutters for a second while spinning up the input shaft, do all my pre-checks, fasten my seatbelt, then get on the brake, let off the parking brake, and put it in gear, and go.

it's how i let the car warm up a little before actually moving it.

Is it that knocking sound for maybe the first half second after it fires up?

hmm I do do this but I start the car other times and it doesn't happen at all and sometimes after a couple hours but not a full day, it makes the same stumbling noise as stated above, just a little less noticeable

yes! that's what I'm referring to, kinda sounds like the engine stops for a split second then proceeds as normal

Oh, yeah! I hear it now. Is this thing bone stock? For how long has it been doing that?

completely! runs and drives perfectly normal as well, this is the only weird thing that I can't quite figure out after pouring through tons of forums and youtube videos

Only on a cold start? Hmmm... Ever tried to wait until the fuel pump quits priming? Just a thought.

It would do that if he had molasses in the transmission.

I mean, cold start yeah, but it's not like the weather is frigid in late october. I get a drop like that when it's nearing -20C. Then again, I drained the factory goop out of my trans at 12000km and I've been running Amsoil 75W90 since.

haven't heard of that until this post, just tried it this afternoon when it usually would have made the noise and nothing... Think you may have solved it, I usually just turn it on immediately, never knew I had to press the button without clutch and brake to prime. Will continue to do this and update if the problem persists. Thanks for your help!!

Interesting! Shouldn't have to but my first thought was fuel starvation. The rail pressure slowly leaks down over time so, if at all, it would present itself on cold start.

Yes, please update! :cheers: