Blueish white smoke - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

90240sr · 05-14-2009, 09:17 PM

I am pretty sure it is something to do with oil because when i get out of m car sometimes it smells like burning oil. Smoke only comes out of my exhaust after i have driven for while and it is only when i leave 1st gear every other light or so. I am not loosing coolant so i figure it isnt a headgasket problem. Anyone have any ideas or had similar problems. I have KA btw.

repda916 · 05-14-2009, 09:19 PM

headgasket?
take radiator cap off, does it smell like gas?

zugoi · 05-14-2009, 09:56 PM

worn oil rings or valve seals or damage to the portion of the head gasket that seals the oil channels and allows oil into combustion chamber.

soreballz · 05-14-2009, 10:15 PM

Quote:

Originally Posted by repda916

headgasket?
take radiator cap off, does it smell like gas?

lolol no.

Your problem is the valve stem seals.

90240sr · 05-14-2009, 11:51 PM

Is there anyway i can confirm it is the valve seals. How bad is it to drive around with worn out seals?

mxexux · 05-15-2009, 12:00 AM

My bet is valve stem seals and/or guides. Only way to know for sure is to pull the head and remove valve springs to check valve side motion in guide. Not really that bad to drive around like that until the back of the valves get so caked with carbon that is starts affecting driveability and smog. Oh and check your oil often as to not run low.

90240sr · 05-15-2009, 12:06 AM

yeah i thought so. what a pain in the ass? I think i have to take smog at the end of this year to. If i seafoam it out will these clean any out any buildup.

hscalixto · 05-15-2009, 12:23 AM

Even if you try and clean the buildup it wont allow you to pass smog, the problem is still present, it wont pass the idle test

FrankDukes · 05-15-2009, 01:48 AM

'White' smoke - usually indicates coolant related.

'Blue' smoke - usually indicates oil related.

'Blackish' smoke - is gas meaning your motor is running rich. (Or a 'white' smoke with strong gas smell).

Common problems are the Piston rings (Oil comes up), Your headgasket going out, valve is stuck open, bad plugs, MAF, bad injectors (Runs Rich or Lean) etc.

1ZlowZ · 05-15-2009, 03:08 AM

I have the same problem its most likely the valve stem seals. Just replace the head, and fix up the one you replaced. I'm going to do that soon. I just need money. I'm a broke student hah.

90240sr · 05-15-2009, 09:39 AM

Thanks guys. Ill check the basic stuff like spark plugs, MAF and injectors. If that doesnt help check into getting a new head for an easier swap out. Whats the torque spec on spark plugs? I think its 11 lbs but not 100%.

handinpants · 05-15-2009, 01:20 PM

Quote:

Originally Posted by mxexux

My bet is valve stem seals and/or guides. Only way to know for sure is to pull the head and remove valve springs to check valve side motion in guide. Not really that bad to drive around like that until the back of the valves get so caked with carbon that is starts affecting driveability and smog. Oh and check your oil often as to not run low.

i'm pretty sure he can do a leakdown compression test, and listen for the air leak, but i might be wrong

*murda-c* · 05-15-2009, 01:24 PM

Quote:

Originally Posted by handinpants

i'm pretty sure he can do a leakdown compression test, and listen for the air leak, but i might be wrong

That's only if the valve seats are bad iirc.

90240sr · 05-19-2009, 11:12 AM

I forgot i have one other symptom i have. Sometimes when i go to start my car it wont start with first turn. Just nothing happens the first time at all no noise. Then the second time it turns on fine.

erupt323 · 05-19-2009, 11:38 AM

Quote:

Originally Posted by 90240sr

I forgot i have one other symptom i have. Sometimes when i go to start my car it wont start with first turn. Just nothing happens the first time at all no noise. Then the second time it turns on fine.

ok sound like ur having the same problem as me. My car also dosent start the first time then the second time it doe. My car smokes the same way as urs its like they are identicle...im still tryig to find out the problem my self i been running my car for about 1 year like that already and i drift like that also no problems yet... i did a compression test and it has good compression so idk what else it can be...when my car smokes its smells really strong..

erupt323 · 05-19-2009, 11:48 AM

ohh btw i also have a KA

90240sr · 05-19-2009, 07:57 PM

Quote:

Originally Posted by erupt323

ok sound like ur having the same problem as me. My car also dosent start the first time then the second time it doe. My car smokes the same way as urs its like they are identicle...im still tryig to find out the problem my self i been running my car for about 1 year like that already and i drift like that also no problems yet... i did a compression test and it has good compression so idk what else it can be...when my car smokes its smells really strong..

Thats crazy man. Let me know if you figure out the problem and if i find anything out ill let you know. Maybe its the LA air. hahah jk

aNskY · 05-19-2009, 08:08 PM

valve stem seals.

you can do it without even pulling the head if you have an air compressor

erupt323 · 05-19-2009, 11:47 PM

how would u do it like that

basicmods · 05-20-2009, 12:35 AM

you pressurize the cylinder while removing the springs to hold the valves shut and keep them from dropping into the cylinder... an oversimplistic walkthrough can be found here - http://www.ehow.com/how_2110646_repl...ls-engine.html

TravisSW · 05-20-2009, 07:25 PM

Quote:

Originally Posted by soreballz

lolol no.

Your problem is the valve stem seals.

QFT:
I have the same issue.

erupt323 · 05-27-2009, 07:22 PM

any one has found out what the problem yet

aNskY · 05-27-2009, 08:43 PM

Quote:

Originally Posted by erupt323

any one has found out what the problem yet

valve stem seals

*slider2828* · 05-27-2009, 09:01 PM

Either way, why go to the trouble. It needs a rebuild based on any of those conditions.

aNskY · 05-27-2009, 09:25 PM

Quote:

Originally Posted by slider2828

Either way, why go to the trouble. It needs a rebuild based on any of those conditions.

are you saying that worn valve stem seals = full rebuild?

shit, my clutch is slipping. i must need a rebuild

s0apgun · 05-27-2009, 09:52 PM

Quote:

Originally Posted by aNskY

are you saying that worn valve stem seals = full rebuild?

shit, my clutch is slipping. i must need a rebuild

lol what he said

*slider2828* · 05-27-2009, 11:28 PM

But he is going to need to take things apart.... If you take it apart, are you just going to put valve seals in there? Where other things might go wrong as well?

*johngriff* · 05-28-2009, 12:00 AM

If you can get the seals on/off without bending the valve against the piston or dropping it I would go for it.

I would like to hear this method though, removing the valve spring?

*landins13* · 05-28-2009, 12:21 AM

did anyone suggest piston rings?

if youre going to replace the valve seals you can do it by pressurizing each cylinder, but you need to be able to do the replacement quickly, if the valves turn, bend twisnt or anything like that you can misaline thewear on the seats and the valves wont seal

*johngriff* · 05-28-2009, 01:27 AM

Quote:

Originally Posted by landins13

did anyone suggest piston rings?

if youre going to replace the valve seals you can do it by pressurizing each cylinder, but you need to be able to do the replacement quickly, if the valves turn, bend twisnt or anything like that you can misaline thewear on the seats and the valves wont seal

??

No, I have rebuilt plenty of engines mixing the valves around, and wire wheeling the valves and cleaning the seats with solvent and had great compression.

Even when I did have new seats and cuts, I still had just wire wheeled valves mixed back in.

05-14-2009, 09:17 PM	#1
90240sr Zilvia Member Join Date: Apr 2003 Location: socal Posts: 216 Trader Rating: (0)	Blueish white smoke I am pretty sure it is something to do with oil because when i get out of m car sometimes it smells like burning oil. Smoke only comes out of my exhaust after i have driven for while and it is only when i leave 1st gear every other light or so. I am not loosing coolant so i figure it isnt a headgasket problem. Anyone have any ideas or had similar problems. I have KA btw. __________________ JFAB "BIGGEST GUNS WEST OF THE MISSISSIPPI"

05-14-2009, 09:56 PM	#3
zugoi Zilvia Junkie Join Date: Aug 2003 Location: Bay area Posts: 540 Trader Rating: (0)	worn oil rings or valve seals or damage to the portion of the head gasket that seals the oil channels and allows oil into combustion chamber. __________________ Drunk posting FTW!

05-14-2009, 11:51 PM	#5
90240sr Zilvia Member Join Date: Apr 2003 Location: socal Posts: 216 Trader Rating: (0)	Is there anyway i can confirm it is the valve seals. How bad is it to drive around with worn out seals? __________________ JFAB "BIGGEST GUNS WEST OF THE MISSISSIPPI"

05-15-2009, 12:06 AM	#7
90240sr Zilvia Member Join Date: Apr 2003 Location: socal Posts: 216 Trader Rating: (0)	yeah i thought so. what a pain in the ass? I think i have to take smog at the end of this year to. If i seafoam it out will these clean any out any buildup. __________________ JFAB "BIGGEST GUNS WEST OF THE MISSISSIPPI"

05-15-2009, 03:08 AM	#10
1ZlowZ Zilvia Junkie Join Date: Mar 2008 Location: Apple Valley Age: 17 Posts: 444 Trader Rating: (0)	I have the same problem its most likely the valve stem seals. Just replace the head, and fix up the one you replaced. I'm going to do that soon. I just need money. I'm a broke student hah. __________________ -Victor S.

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05-14-2009, 09:19 PM	#2
repda916 Zilvia Junkie Join Date: Jun 2008 Location: cali Age: 18 Posts: 481 Trader Rating: (0)	headgasket? take radiator cap off, does it smell like gas?

05-15-2009, 12:00 AM	#6
mxexux Leaky Injector Join Date: Jun 2008 Location: SoCal 949 Posts: 114 Trader Rating: (0)	My bet is valve stem seals and/or guides. Only way to know for sure is to pull the head and remove valve springs to check valve side motion in guide. Not really that bad to drive around like that until the back of the valves get so caked with carbon that is starts affecting driveability and smog. Oh and check your oil often as to not run low.

05-15-2009, 12:23 AM	#8
hscalixto Leaky Injector Join Date: Feb 2009 Location: Buena Park Posts: 66 Trader Rating: (6)	Even if you try and clean the buildup it wont allow you to pass smog, the problem is still present, it wont pass the idle test

05-15-2009, 01:48 AM	#9
FrankDukes BANNED Join Date: Dec 2008 Location: 818 & 747 area. Posts: 365 Trader Rating: (1)	'White' smoke - usually indicates coolant related. 'Blue' smoke - usually indicates oil related. 'Blackish' smoke - is gas meaning your motor is running rich. (Or a 'white' smoke with strong gas smell). Common problems are the Piston rings (Oil comes up), Your headgasket going out, valve is stuck open, bad plugs, MAF, bad injectors (Runs Rich or Lean) etc.

05-15-2009, 09:39 AM	#11
90240sr Zilvia Member Join Date: Apr 2003 Location: socal Posts: 216 Trader Rating: (0)	Thanks guys. Ill check the basic stuff like spark plugs, MAF and injectors. If that doesnt help check into getting a new head for an easier swap out. Whats the torque spec on spark plugs? I think its 11 lbs but not 100%. __________________ JFAB "BIGGEST GUNS WEST OF THE MISSISSIPPI"

05-19-2009, 11:12 AM	#14
90240sr Zilvia Member Join Date: Apr 2003 Location: socal Posts: 216 Trader Rating: (0)	I forgot i have one other symptom i have. Sometimes when i go to start my car it wont start with first turn. Just nothing happens the first time at all no noise. Then the second time it turns on fine. __________________ JFAB "BIGGEST GUNS WEST OF THE MISSISSIPPI"

05-19-2009, 11:48 AM	#16
erupt323 Zilvia Junkie Join Date: Nov 2007 Location: Los Angeles Age: 22 Posts: 439 Trader Rating: (5)	ohh btw i also have a KA __________________

05-19-2009, 08:08 PM	#18
aNskY Zilvia FREAK! Join Date: Apr 2005 Location: NY Age: 25 Posts: 1,495 Trader Rating: (8)	valve stem seals. you can do it without even pulling the head if you have an air compressor

05-19-2009, 11:47 PM	#19
erupt323 Zilvia Junkie Join Date: Nov 2007 Location: Los Angeles Age: 22 Posts: 439 Trader Rating: (5)	how would u do it like that __________________

05-20-2009, 12:35 AM	#20
basicmods Leaky Injector Join Date: Mar 2006 Location: Rolla, MO Age: 27 Posts: 86 Trader Rating: (2)	you pressurize the cylinder while removing the springs to hold the valves shut and keep them from dropping into the cylinder... an oversimplistic walkthrough can be found here - http://www.ehow.com/how_2110646_repl...ls-engine.html __________________ '91 240SX hatch complete with super rare sunroof insert and bag!

05-27-2009, 07:22 PM	#22
erupt323 Zilvia Junkie Join Date: Nov 2007 Location: Los Angeles Age: 22 Posts: 439 Trader Rating: (5)	any one has found out what the problem yet __________________

05-27-2009, 09:01 PM	#24
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 3,457 Trader Rating: (8)	Either way, why go to the trouble. It needs a rebuild based on any of those conditions. __________________ Turn and Burn!

05-27-2009, 11:28 PM	#27
slider2828 Premium Member Join Date: Oct 2004 Location: San Francisco, CA Posts: 3,457 Trader Rating: (8)	But he is going to need to take things apart.... If you take it apart, are you just going to put valve seals in there? Where other things might go wrong as well? __________________ Turn and Burn!

05-28-2009, 12:00 AM	#28
johngriff @RPSport.net! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,042 Trader Rating: (4) Rides Gallery: johngriff	If you can get the seals on/off without bending the valve against the piston or dropping it I would go for it. I would like to hear this method though, removing the valve spring? __________________ RPSport 949.891.1710 RPSport's New Products for the S13 and SR20! Join our Haltech Group Buy! John@RPSport.net

05-28-2009, 12:21 AM	#29
landins13 You love to hate me! Join Date: Jan 2008 Location: Baltimore Posts: 532 Trader Rating: (2)	did anyone suggest piston rings? if youre going to replace the valve seals you can do it by pressurizing each cylinder, but you need to be able to do the replacement quickly, if the valves turn, bend twisnt or anything like that you can misaline thewear on the seats and the valves wont seal __________________ turbo lag is my way of giving you a head start !!NO HANDS IN PANTS!!

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