Help - new FI HFC leaking at gaskets on exhaust side

InnerDragon10 · 03-23-2015, 01:35 PM

Got the SES light again. However, I admit that I didn't let the copper permatex set for 24 hrs before returning to service (more like one hour, I just didn't have the time to let it sit), and I only re-did the y-pipe to HFC flanges. Looks like I'll have to pull it all down this weekend (have four new gaskets on order), and will apply sealant to all four flanges. Sigh.

37zeroZ · 03-23-2015, 05:45 PM

Quote:

Originally Posted by InnerDragon10

Got the SES light again. However, I admit that I didn't let the copper permatex set for 24 hrs before returning to service (more like one hour, I just didn't have the time to let it sit), and I only re-did the y-pipe to HFC flanges. Looks like I'll have to pull it all down this weekend (have four new gaskets on order), and will apply sealant to all four flanges. Sigh.

I let mine sit for nearly two days. Overkill, however, I applied a fair amount to each side of the gasket.

Merv · 03-23-2015, 06:27 PM

What I did was just snug up all 3 nuts,than do another round of tightening on all 3,THEN I torqued the sh:t out of them! Kind of like how you do the lugs on the wheel.

37zeroZ · 03-23-2015, 07:21 PM

Quote:

Originally Posted by Merv

What I did was just snug up all 3 nuts,than do another round of tightening on all 3,THEN I torqued the sh:t out of them! Kind of like how you do the lugs on the wheel.

Won't work if the flanges are off. I even purchased higher strength hardware thinking I can muscle stainless steel. I was wrong.......even afraid I would crack the weld joints. The Ultra Cooper solved my problem......simple and solved my problems.

Merv · 03-24-2015, 08:22 AM

Quote:

Originally Posted by 37zeroZ

Won't work if the flanges are off. I even purchased higher strength hardware thinking I can muscle stainless steel. I was wrong.......even afraid I would crack the weld joints. The Ultra Cooper solved my problem......simple and solved my problems.

I just re read the post and seen he's using high flows in conjunction with nismo exhaust. I could see how they might not match up.

InnerDragon10 · 03-24-2015, 05:45 PM

Quote:

Originally Posted by 37zeroZ

Won't work if the flanges are off. I even purchased higher strength hardware thinking I can muscle stainless steel. I was wrong.......even afraid I would crack the weld joints. The Ultra Cooper solved my problem......simple and solved my problems.

So you had some exhaust leaks and resolved them with permatex? I hope that's the case for me, I'm gonna be pissed if that SES light still comes up..

37zeroZ · 03-24-2015, 09:55 PM

Quote:

Originally Posted by InnerDragon10

So you had some exhaust leaks and resolved them with permatex? I hope that's the case for me, I'm gonna be pissed if that SES light still comes up..

Yes, as stated, I had four flange leaks and used Permatex Ultra Copper to stop the leaks. I waited longer than the recommended 24-hours to fully dry before I fired up the Z and drove off.

The SES can be or not be related to a problem with your exhaust. I suggest after you correctly Permatex your seals is to reset your ECU.

Here's a good link to do so:

RESET ECU alternative method

03-23-2015, 06:27 PM	#3 (permalink)
Merv Track Member Join Date: Dec 2013 Location: Vancouver B.C Posts: 518 Drives: 11 GM grey sport tou Rep Power: 16	What I did was just snug up all 3 nuts,than do another round of tightening on all 3,THEN I torqued the sh:t out of them! Kind of like how you do the lugs on the wheel. InnerDragon10 likes this. __________________ Swift springs \| upgraded headlights \| stillen gen3 cai \| FI HFC's and FI CBE \| ecutek tune in the mail!

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03-23-2015, 01:35 PM	#1 (permalink)
InnerDragon10 Base Member Join Date: Mar 2014 Location: USA Posts: 90 Drives: '14 Black 370Z Nismo Rep Power: 13	Got the SES light again. However, I admit that I didn't let the copper permatex set for 24 hrs before returning to service (more like one hour, I just didn't have the time to let it sit), and I only re-did the y-pipe to HFC flanges. Looks like I'll have to pull it all down this weekend (have four new gaskets on order), and will apply sealant to all four flanges. Sigh.