Loud Rattling Noise at Start Up - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

tomaszjanczak · 09-05-2014, 04:25 PM

Hello everyone!

Does anybody know what is making this noise whenever I start the car? The rattling goes on for a couple of seconds after starting. If I turn the car off and quickly start it up again, the noise doesn't happen. However, if I wait even 5 minutes after turning it off, the noise comes back when I go to start it again.

Someone told me its pre-detonation (knock) because of poor fuel. Not sure if that is the case.

Thank you!

[ame]http://www.youtube.com/watch?v=Dffoe78k14Q[/ame]

tennisfreak · 09-05-2014, 04:31 PM

Holy shit that sounds terrible.

If it was bad fuel why would the sound go away like that?

tomaszjanczak · 09-05-2014, 04:54 PM

Quote:

Originally Posted by tennisfreak

Holy shit that sounds terrible.

If it was bad fuel why would the sound go away like that?

Because the computer senses the knock and adjusts the engine parameters for the lower octane fuel.

D_Thissen · 09-05-2014, 06:43 PM

I'm not an expert so hopefully someone can chime in. I would think the knock wouldn't disappear shortly after start (since the fuel quality isn't changing).

Would it have something to do with injectors? Doesn't the fa20 start on direct then switch to the port? Again I might be mistaken (more than likely I am) so hopefully someone more knowledgeable will have an answer.

tomaszjanczak · 09-05-2014, 06:48 PM

Quote:

Originally Posted by D_Thissen

I'm not an expert so hopefully someone can chime in. I would think the knock wouldn't disappear shortly after start (since the fuel quality isn't changing).

Would it have something to do with injectors? Doesn't the fa20 start on direct injectors then go to after it warms up switch to port injection?

I agree with you. I also thought knocking had a different sound than this. Not sure about the injectors but this happens when the engine is cold and when it is warmed up as well.

roddy · 09-05-2014, 09:01 PM

That sounds ugly. Definitely something I would want a dealer to look at. The sound seems to go away as the engine builds some oil pressure...cant really tell from the video, but it is likely either valvetrain related, or (gulp) the bottom end. Get it to a dealer. Just an opinion...others may vary.

2013GTRNate · 09-05-2014, 11:34 PM

Go to the dealership. There is nothing normal about those sounds. It sounds like the Pistons are rubbing on the cylinder walls. Terrible sounds are coming from your engine.

Good luck the dealership should make it right.

Muaddib · 09-06-2014, 12:20 AM

Damn that doesn't sound good. That is definitely not from bad gas. Have you checked your oil level lately?

EZWood · 09-06-2014, 02:38 AM

Sounds like shit, when's the last time you changed your oil?

litemup · 09-06-2014, 03:01 AM

Quote:

Originally Posted by EZWood

Sounds like shit, when's the last time you changed your oil?

I'm gonna go out on a limb. A/C compressor? Disengages after fault detect? No CELs?

tomaszjanczak · 09-06-2014, 06:55 AM

Quote:

Originally Posted by litemup

I'm gonna go out on a limb. A/C compressor? Disengages after fault detect? No CELs?

No CELs. AC works fine.

tomaszjanczak · 09-06-2014, 06:57 AM

Quote:

Originally Posted by EZWood

Sounds like shit, when's the last time you changed your oil?

About 4 months ago (I go by months since I don't drive enough for the mileage count). I was actually planning on changing it today since I do it about every 4 months so I'll see if this somehow fixes the problem. Oil level has been good.

tomaszjanczak · 09-06-2014, 06:58 AM

Quote:

Originally Posted by Muaddib

Damn that doesn't sound good. That is definitely not from bad gas. Have you checked your oil level lately?

Yes, I regularly check it and it has been good throughout the 4 months since I last changed my oil. I'm planning on changing it today though.

tomaszjanczak · 09-06-2014, 07:01 AM

Quote:

Originally Posted by roddy

That sounds ugly. Definitely something I would want a dealer to look at. The sound seems to go away as the engine builds some oil pressure...cant really tell from the video, but it is likely either valvetrain related, or (gulp) the bottom end. Get it to a dealer. Just an opinion...others may vary.

You seem to be right about the built up oil pressure because if I turn the car off and immediately turn it on, the sound doesn't happen. But if I wait a minute and then turn it on, the sound happens. I do plan on taking to the dealer now, it sounds like a serious problem.

09-05-2014, 06:43 PM	#4
D_Thissen Senior Member Join Date: Jan 2014 Drives: '13 Argento FR-S (Sold) Location: Ontario Posts: 2,126 Thanks: 3,209 Thanked 1,439 Times in 855 Posts Mentioned: 19 Post(s) Tagged: 2 Thread(s)	I'm not an expert so hopefully someone can chime in. I would think the knock wouldn't disappear shortly after start (since the fuel quality isn't changing). Would it have something to do with injectors? Doesn't the fa20 start on direct then switch to the port? Again I might be mistaken (more than likely I am) so hopefully someone more knowledgeable will have an answer. __________________ My FR-S Build IG: dthissen

09-05-2014, 09:01 PM	#6
roddy Senior Member Join Date: Apr 2012 Drives: '13 Ultramarine Location: Ontario Canada Posts: 2,243 Thanks: 1,476 Thanked 1,165 Times in 685 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	That sounds ugly. Definitely something I would want a dealer to look at. The sound seems to go away as the engine builds some oil pressure...cant really tell from the video, but it is likely either valvetrain related, or (gulp) the bottom end. Get it to a dealer. Just an opinion...others may vary. __________________ no man with a good car needs to be justified...

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