Replaced head gasket, exhaust still white.

Supraflymk3

Supraman
Dec 17, 2005
272
0
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Neenah, Wisconsin, United States
So I just replaced my head gasket on my 91 cressida. I have replaced many head gaskets on 7ms so please rule out stupidity on this. I replaced the stock head bolts with arp head studs, had my head cleaned and checked for warpage and it was within spec according to the tcrm. i cleaned the gasket surface on the block very well. then i put the head on torqued the nuts down to arp spec which is 90 ft'lb. So my situation is after I put everything back together I set the timing with just the exhaust manifold on and the exhaust blowing out looked normal(basically unseen) the day after i bolted the exhaust back on started it up and it was blowing white smoke still and smellt like burning coolant. My thought was that there was coolant sitting in the exhaust pipes and mufflers and cat and it was just burning off, after I let it run for about an hour the white was slowly starting to diminsh. Today I drained out the fresh oil that i put in right after the gasket replacement just to make sure i got out all the sludge and shit. then i put new oil in, started it up and the exhaust wasn't as white and its starting to lose its smell. So my thought here was that there was still coolant molecules in the oil and it was burning it out of the oil. is this realistic or what are your thoughts. I also pulled the o2 sensor out today and started it up and was seeing if htere was white smoke coming out of the hole but it looked invisible. so i think one of my theories is right but i just wanted some other opinions.
 

fonz87

89 Turbo!!!!
Nov 17, 2007
642
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Streamwood, IL
well it can be your turbo also, just don't stress out to much untill you do a compression test, leaked down. just to see if your turbo is good or bad ? your turbo can be bad where it can be leaking..i dont know. i m throwing some ideas for ya.
 

Moy

It's broken...
Aug 6, 2008
2,432
0
36
Beach Park, IL
fonz87;1524097 said:
well it can be your turbo also, just don't stress out to much untill you do a compression test, leaked down. just to see if your turbo is good or bad ? your turbo can be bad where it can be leaking..i dont know. i m throwing some ideas for ya.

quit trying Fasi, he never even stated he has a turbo. Not all 7M's came with turbos. (not trying to be an a**hole)

OP: if you had blown your headgasket, there is a very good chance that the coolant got trapped in the catalytic converter(s) and is slowly burning off. The white smoke and smell with eventually go away (if that's the case)
 

empera

Authorized Vendor
Mar 30, 2005
4,548
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Philly.
i didnt read the post but on my sc...i had white smoke coming out for about 20 mins after i replaced the HG, also did a lot of flushing...
 

Supraflymk3

Supraman
Dec 17, 2005
272
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Neenah, Wisconsin, United States
sorry forgot to say that it was a 7M-GE. Figured that most supra enthusiast would know that a cressida came only with the GE. But about the catalytic convertor theory I'm pretty sure thats whats going on. Thanks for the comment.
 

SupraMario

I think it was the google
Mar 30, 2005
3,467
6
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38
The Farm
Supraflymk3;1524150 said:
sorry forgot to say that it was a 7M-GE. Figured that most supra enthusiast would know that a cressida came only with the GE. But about the catalytic convertor theory I'm pretty sure thats whats going on. Thanks for the comment.

When we changed the HG on my friends, for the drive back to his place he had white smoke. It's gone now so, I'm betting that is what it is.
 

Moy

It's broken...
Aug 6, 2008
2,432
0
36
Beach Park, IL
hvyman;1524464 said:
might. coolant ruins o2 sensors as well.

Coolant could kill a cat, but not immediately. O2 sensors, on the other hand will go bad due one of it's ingredients eating away at the platinum inside the sensor