Knocking/loss in oil pressure - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Bullnettles · 12-06-2016, 03:16 PM

Had the coilpack on cylinder #1 replaced (and added heat tape) and 2 days later I heard knocking that went away as fast as it came. I had nowhere to pull off and it stopped, so I went another 1/4 mile and it came back w/an oil pressure light. Killed it and cleared it from the freeway (now off the entrance ramp so I had a shoulder). I know of the camshaft TSB, but this threw no codes until it happened, and I never checked them. I just got word of the following codes:
U0073 - Lack of communication between modules?
C1241 - Low voltage
C1201 - Brake control system turns off (explains why the TCS light blinked on the first time it started knocking)

Buddy thinks it may just have issues telling the injectors to fire (this did happen right about when the EFI would turn off, if I'm not mistaken (10 minutes after starting or so).

Thoughts?

Ultramaroon · 12-06-2016, 04:07 PM

If the coil pack job was done by the book they pulled the engine. Look for a loose connector anywhere in the engine bay. This includes ground straps. I've almost forgotten to latch the connectors on the DI controller. They can just slip loose.

Bullnettles · 12-06-2016, 04:09 PM

Thank you, I'll check.

Bullnettles · 12-16-2016, 09:38 AM

Brass in the filter, new (used) motor arrives on Tuesday, should have it back together Xmas weekend. Plugs looked fine, will pull apart once life calms down a bit and see if I can salvage the heads. Selling the car, though.

Using Imgur for the image and not working, anyone want to lmk where I'm going wrong?

http://imgur.com/a/pGkrX

DarkSunrise · 12-16-2016, 10:25 AM

I was data logging the last time my car threw a P0351 code at the track. Once the coilpack went bad, there was significant FLKC above 5500 RPM, in the range of -4 to -5 degrees. Wonder if that was what did your engine in (if you were pushing the car hard at the time).

Bullnettles · 12-16-2016, 10:30 AM

Then I bet that's what happened. I wasn't flogging it, but it did see 6k+ a few times after the code. Son of a gun.

12-06-2016, 04:07 PM	#2
Ultramaroon extra what? Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,085 Thanks: 52,528 Thanked 36,809 Times in 19,084 Posts Mentioned: 1111 Post(s) Tagged: 9 Thread(s)	If the coil pack job was done by the book they pulled the engine. Look for a loose connector anywhere in the engine bay. This includes ground straps. I've almost forgotten to latch the connectors on the DI controller. They can just slip loose. __________________ service manuals

12-16-2016, 10:25 AM	#5
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,795 Thanks: 2,171 Thanked 4,242 Times in 2,220 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	I was data logging the last time my car threw a P0351 code at the track. Once the coilpack went bad, there was significant FLKC above 5500 RPM, in the range of -4 to -5 degrees. Wonder if that was what did your engine in (if you were pushing the car hard at the time). __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

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12-06-2016, 03:16 PM	#1
Bullnettles Senior Member Join Date: Apr 2013 Drives: Scion FR-S 2013 Location: Houston, TX Posts: 257 Thanks: 89 Thanked 32 Times in 26 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Knocking/loss in oil pressure Had the coilpack on cylinder #1 replaced (and added heat tape) and 2 days later I heard knocking that went away as fast as it came. I had nowhere to pull off and it stopped, so I went another 1/4 mile and it came back w/an oil pressure light. Killed it and cleared it from the freeway (now off the entrance ramp so I had a shoulder). I know of the camshaft TSB, but this threw no codes until it happened, and I never checked them. I just got word of the following codes: U0073 - Lack of communication between modules? C1241 - Low voltage C1201 - Brake control system turns off (explains why the TCS light blinked on the first time it started knocking) Buddy thinks it may just have issues telling the injectors to fire (this did happen right about when the EFI would turn off, if I'm not mistaken (10 minutes after starting or so). Thoughts?

12-06-2016, 04:09 PM	#3
Bullnettles Senior Member Join Date: Apr 2013 Drives: Scion FR-S 2013 Location: Houston, TX Posts: 257 Thanks: 89 Thanked 32 Times in 26 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Thank you, I'll check.

12-16-2016, 09:38 AM	#4
Bullnettles Senior Member Join Date: Apr 2013 Drives: Scion FR-S 2013 Location: Houston, TX Posts: 257 Thanks: 89 Thanked 32 Times in 26 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Brass in the filter, new (used) motor arrives on Tuesday, should have it back together Xmas weekend. Plugs looked fine, will pull apart once life calms down a bit and see if I can salvage the heads. Selling the car, though. Using Imgur for the image and not working, anyone want to lmk where I'm going wrong? http://imgur.com/a/pGkrX

12-16-2016, 10:30 AM	#6
Bullnettles Senior Member Join Date: Apr 2013 Drives: Scion FR-S 2013 Location: Houston, TX Posts: 257 Thanks: 89 Thanked 32 Times in 26 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Then I bet that's what happened. I wasn't flogging it, but it did see 6k+ a few times after the code. Son of a gun.

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