Please confirm that this is a bad headgasket.

suprasforlife · 08-25-2006, 08:13 PM

Check your oil for coolant. If there is coolant, it is a BHG. If you can't see any, smell the oil that is on the dip stick and see if you smell coolant. Any coolant in oil means BHG.

Slater · 08-25-2006, 09:07 PM

I have a spare JDM motor here so I'll swap out the T stat when I get time. For now I have 5 days to pass emmisions. Is the BHG related to the high NOx reading? Is there anything I can do right now to pass emmisions besides try to replace the HG and see if that fixes it?

You probably see these threads pop up every once in a while, thanks for having patience with a n00b.

Isphius · 08-25-2006, 11:22 PM

For your high nox, replace your cat and see if your egr is working. I am not 100% sure on this, but my 7mge had a minor hg leak and my nox were 3x higher than passing. I never fixed it and went back to inspection thou so i dont know if that was a cause. And that was with a working egr valve. and old cat. To test the egr, Way at the back of the motor on the driver side there is a round thing bolted to your intake, And the vaccum line that goes to the back of it is your egr valve. Plug that vaccum line into a direct vaccum, Like the one at the very back on the intake. If your motor coughs or sputters, It is working. It may even stall. And im not sure how to test the modulator (round part), But those are very easy to replace if bad. As long as your valve works and coughs the engine out your ok.

08-25-2006, 09:07 PM	#2
Slater Stock Join Date: Aug 2006 Location: Northern VA Posts: 3	I have a spare JDM motor here so I'll swap out the T stat when I get time. For now I have 5 days to pass emmisions. Is the BHG related to the high NOx reading? Is there anything I can do right now to pass emmisions besides try to replace the HG and see if that fixes it? You probably see these threads pop up every once in a while, thanks for having patience with a n00b. __________________ 1987 Toyota Supra Turbo Please PM me if you are local (1-2 hrs away) and have parts cars.

08-25-2006, 11:22 PM	#3
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	For your high nox, replace your cat and see if your egr is working. I am not 100% sure on this, but my 7mge had a minor hg leak and my nox were 3x higher than passing. I never fixed it and went back to inspection thou so i dont know if that was a cause. And that was with a working egr valve. and old cat. To test the egr, Way at the back of the motor on the driver side there is a round thing bolted to your intake, And the vaccum line that goes to the back of it is your egr valve. Plug that vaccum line into a direct vaccum, Like the one at the very back on the intake. If your motor coughs or sputters, It is working. It may even stall. And im not sure how to test the modulator (round part), But those are very easy to replace if bad. As long as your valve works and coughs the engine out your ok. __________________ Yay the supra assistant is gone!!! WEEE!!

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08-25-2006, 08:13 PM	#1
suprasforlife 3" Exhaust Join Date: Jun 2006 Location: Montana Posts: 71	Check your oil for coolant. If there is coolant, it is a BHG. If you can't see any, smell the oil that is on the dip stick and see if you smell coolant. Any coolant in oil means BHG.