e-Diagnose knock/tapping? (w/Video) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

DIE1000DEATHS · 11-15-2015, 02:40 PM

Anyone care to lend expertise??

Situation: Hard acceleration into traffic, went through first and second gear.
Likely caused, or helped by oil not being up to significant operating temp, as I just left work.
No CEL produced, and car drove "normal", several miles home, but all while making this noise.
Stopped and started motor back up without issue.

Initial thought is valve tap, but there's plenty of smarter people on here than me. I'm savvy enough to do most things on my car, except for a total block rebuild (I'm smart enough to leave that to people with plenty of experience and the proper tools).

Thanks for your feedback!
-Aaron

humfrz · 11-15-2015, 03:58 PM

Is that a supercharger I see ...... ??

If so, I'd suggest you put an ear on it (via a long screwdriver) to see if it is making the noise.

humfrz

Ultramaroon · 11-15-2015, 04:24 PM

Quote:

Originally Posted by humfrz

Is that a supercharger I see ...... ??

If so, I'd suggest you put an ear on it (via a long screwdriver) to see if it is making the noise.

humfrz

Nah. I've had one of those apart. Not the culprit. That's a blown rocker or a bent valve. Sounds like more than one.

BRZnut · 11-16-2015, 07:36 PM

Sounds like rod knock from a lower end problem that seems to happen way too often from oil starvation.

Ultramaroon · 11-16-2015, 10:15 PM

Quote:

Originally Posted by BRZnut

Sounds like rod knock from a lower end problem that seems to happen way too often from oil starvation.

Listened again. May I change my answer?

humfrz · 11-16-2015, 11:52 PM

Quote:

Originally Posted by Ultramaroon

Listened again. May I change my answer?

NO! This is NOT multiple choice ........

Where did the OP run off to ....... maybe checking prices for a new short block .....??

humfrz

Ultramaroon · 11-17-2015, 12:24 AM

Quote:

Originally Posted by humfrz

NO! This is NOT multiple choice ........

Where did the OP run off to ....... maybe checking prices for a new short block .....??

humfrz

pantdino · 11-17-2015, 12:57 AM

Quote:

Originally Posted by BRZnut

Sounds like rod knock from a lower end problem that seems to happen way too often from oil starvation.

Sounds too high-pitched to be a rod knock to me-- sounds more like something in the head.

Ultramaroon · 11-17-2015, 01:41 AM

Quote:

Originally Posted by pantdino

Sounds too high-pitched to be a rod knock to me-- sounds more like something in the head.

I thought so too but it has the characteristic double-whack sound. That's what turned me.

BRZnut · 11-17-2015, 07:50 PM

any updates? Take it to the dealer yet?? (wonder where the Op is...likely on the side of the road with a seized engine)

DIE1000DEATHS · 11-17-2015, 11:17 PM

Lol. Sorry guys. Hell no it has not gone to dealer. (Superchargers don't go over well) I haven't driven it since. I have been wanting to build the block as it is, as I have the Sprintex 335 kit and I expected to need it sooner or later. I just didn't know if any of you guys were super familiar with this. If it was for sure something in the head, I may delay the short block work.... Thanks eRRbody!

Ultramaroon · 11-17-2015, 11:26 PM

Quote:

Originally Posted by DIE1000DEATHS

Lol. Sorry guys. Hell no it has not gone to dealer. (Superchargers don't go over well) I haven't driven it since. I have been wanting to build the block as it is, as I have the Sprintex 335 kit and I expected to need it sooner or later. I just didn't know if any of you guys were super familiar with this. If it was for sure something in the head, I may delay the short block work.... Thanks eRRbody!

Staying subbed. Keep us in the loop.

humfrz · 11-17-2015, 11:54 PM

Quote:

Originally Posted by Ultramaroon

I thought so too but it has the characteristic double-whack sound. That's what turned me.

Are they the two whack sounds when the piston hits the dropped valve on the compression stroke and then again on the exhaust stroke .......

humfrz

Ultramaroon · 11-18-2015, 12:18 AM

Quote:

Originally Posted by humfrz

Are they the two whack sounds when the piston hits the dropped valve on the compression stroke and then again on the exhaust stroke .......

humfrz

Dammit, when am I gonna learn not to change my answers. If I waffled any more I'd be breakfast. Went back and listened to a bunch of rod bearing vids. I'm full of shit.

11-15-2015, 02:40 PM	#1
DIE1000DEATHS TechNINJA Join Date: Jun 2012 Drives: Whiteout MT, 87 Mustang, 09 RUCKUS Location: Detroit, Murder Mitten Posts: 130 Thanks: 73 Thanked 46 Times in 27 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	e-Diagnose knock/tapping? (w/Video) Anyone care to lend expertise?? Situation: Hard acceleration into traffic, went through first and second gear. Likely caused, or helped by oil not being up to significant operating temp, as I just left work. No CEL produced, and car drove "normal", several miles home, but all while making this noise. Stopped and started motor back up without issue. Initial thought is valve tap, but there's plenty of smarter people on here than me. I'm savvy enough to do most things on my car, except for a total block rebuild (I'm smart enough to leave that to people with plenty of experience and the proper tools). Thanks for your feedback! -Aaron

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Knock Correction vs Knock Correction Learn values?	swift996	Software Tuning	19	11-03-2015 10:09 PM
Tapping sound above 70 mph	Fugazi	BRZ First-Gen (2012+) -- General Topics	24	10-20-2015 04:04 AM
Help diagnose picture from inside bellhousing	toeout	Issues \| Warranty \| Recalls / TSB	1	07-12-2015 07:57 PM
Tapping into Fog Lights	milhouse	Cosmetic Modification (Interior/Exterior/Lighting)	0	10-17-2013 04:42 PM
Tapping my oil feed	Silverdub	Forced Induction	9	10-17-2012 04:22 PM

11-15-2015, 03:58 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,061 Thanks: 29,122 Thanked 32,202 Times in 16,572 Posts Mentioned: 709 Post(s) Tagged: 2 Thread(s)	Is that a supercharger I see ...... ?? If so, I'd suggest you put an ear on it (via a long screwdriver) to see if it is making the noise. humfrz

11-16-2015, 07:36 PM	#4
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Sounds like rod knock from a lower end problem that seems to happen way too often from oil starvation.

11-17-2015, 07:50 PM	#10
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	any updates? Take it to the dealer yet?? (wonder where the Op is...likely on the side of the road with a seized engine)

11-17-2015, 11:17 PM	#11
DIE1000DEATHS TechNINJA Join Date: Jun 2012 Drives: Whiteout MT, 87 Mustang, 09 RUCKUS Location: Detroit, Murder Mitten Posts: 130 Thanks: 73 Thanked 46 Times in 27 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Lol. Sorry guys. Hell no it has not gone to dealer. (Superchargers don't go over well) I haven't driven it since. I have been wanting to build the block as it is, as I have the Sprintex 335 kit and I expected to need it sooner or later. I just didn't know if any of you guys were super familiar with this. If it was for sure something in the head, I may delay the short block work.... Thanks eRRbody!

User Name		Remember Me?
Password