white smoke?

codster.cab · 10-21-2011, 08:52 PM

My supra smokes when it cold starts, and everytime i shift under pressure.
I thought the valve seals bc of the cold start only, now it started smokin everytime I shift, can anybody help?I appreciate it.
thanks
cody
1987 turbo

cre · 10-22-2011, 12:07 AM

The smoke should actually be bluish.... white would be coolant (which smells sweet too). Yes, smoke on decel and cold start is typically valve stem seals.

87hilux7mge · 10-22-2011, 04:27 AM

turbo or n/a? (im gonna assume turbo) white smoke, id say egr cooler or bhg...i wanna say egr cooler cuz its while shifting under power. but what the hell do i know....

codster.cab · 10-22-2011, 06:01 AM

thats y I was thinking valve seals, but as said above, oil would be bluish..coolant...possiblitly its something to do with the coolant lines to the turbo>
EGR cooler was a thought, lol but, I dont have any emmisions control on her besides the charcoal canister, sadly she was like that when i got her..

cre · 10-22-2011, 08:35 PM

No, any coolant passage which could possibly leak into the system would cause more smoke the HARDER you were on it... Also, the turbo's coolant passage has fairly beefy walls it's not a common location for erosion to the point of leaking. The head gasket and then the throttle body are the most likely suspects for a coolant leak followed by the ISCV and then the turbo. I'm doubtful that it's coolant though; bad lighting or looking at it thinned out in the air as the car is moving are enough to make other types of smoke look white sometimes. I'd stand behind the car and have someone start it and see if it smells sweet at all (don't put your nose to the muffler, a casual wiff should be plenty to determine if it's oil or coolant

).

Leaking turbo seals don't typically spew enough oil to smoke on a cold start and they tend to smoke the most when boosting. It is easy enough to check though, clean out the IC piping and check it again in a couple days; There will be some oil in it when you first pull it, it's a sacrificial seal and always loses some oil but you shouldn't see much new oil in such a short period of time.

Excessive crank case pressure is another possibility... Especially if the PCV system has been deleted (a bad idea even on a healthy engine). If there is high crank case pressure and the PCV system is in place you may notice oil BEFORE the turbo.

10-21-2011, 08:52 PM	#1
codster.cab Stock Join Date: Oct 2011 Location: Glendale AZ Posts: 7	white smoke? My supra smokes when it cold starts, and everytime i shift under pressure. I thought the valve seals bc of the cold start only, now it started smokin everytime I shift, can anybody help?I appreciate it. thanks cody 1987 turbo

10-22-2011, 12:07 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The smoke should actually be bluish.... white would be coolant (which smells sweet too). Yes, smoke on decel and cold start is typically valve stem seals. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

10-22-2011, 04:27 AM	#3
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	turbo or n/a? (im gonna assume turbo) white smoke, id say egr cooler or bhg...i wanna say egr cooler cuz its while shifting under power. but what the hell do i know.... __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

10-22-2011, 08:35 PM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	No, any coolant passage which could possibly leak into the system would cause more smoke the HARDER you were on it... Also, the turbo's coolant passage has fairly beefy walls it's not a common location for erosion to the point of leaking. The head gasket and then the throttle body are the most likely suspects for a coolant leak followed by the ISCV and then the turbo. I'm doubtful that it's coolant though; bad lighting or looking at it thinned out in the air as the car is moving are enough to make other types of smoke look white sometimes. I'd stand behind the car and have someone start it and see if it smells sweet at all (don't put your nose to the muffler, a casual wiff should be plenty to determine if it's oil or coolant ). Leaking turbo seals don't typically spew enough oil to smoke on a cold start and they tend to smoke the most when boosting. It is easy enough to check though, clean out the IC piping and check it again in a couple days; There will be some oil in it when you first pull it, it's a sacrificial seal and always loses some oil but you shouldn't see much new oil in such a short period of time. Excessive crank case pressure is another possibility... Especially if the PCV system has been deleted (a bad idea even on a healthy engine). If there is high crank case pressure and the PCV system is in place you may notice oil BEFORE the turbo. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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10-22-2011, 06:01 AM	#4
codster.cab Stock Join Date: Oct 2011 Location: Glendale AZ Posts: 7	thats y I was thinking valve seals, but as said above, oil would be bluish..coolant...possiblitly its something to do with the coolant lines to the turbo> EGR cooler was a thought, lol but, I dont have any emmisions control on her besides the charcoal canister, sadly she was like that when i got her..