KA-T smoking - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

OkiDori17 · 10-21-2013, 04:29 AM

What's going on guys.
So I've searched and searched and can not come to a conclusion why my car keeps smoking the way it is.
I had a ton (9+) vacuum leaks when I got the car. I removed my intake manifold and replaced all the lines and routed them the correct way (last owner had no clue what he was doing).
Did a boost leak test, that was good.
Compression test, that was good.
Leak down test, that was good.

Now it doesn't always smoke. Only usually after sitting at idle or low rpms for awhile.
Can't 100% tell if it's oil or coolant, possibly both.

Any help as to where to look next will be appreciated.

motteramm · 10-22-2013, 07:36 PM

If you don't have a water line running in your turbo, could be oil burning up inside the turbo, or it could be oil going through your intercooler piping that is getting sent into the combustion chamber after you get on the gas. Do you have an oil catch can? And what turbo are you running?

OkiDori17 · 10-24-2013, 11:04 AM

It's a t25 turbo
It's oil and water cooled
The smoke is blue-ish in color but smells sweet?
I took off my hot pipe and there is oil in there so I'm suspecting the turbo to be going.
It only smokes at idle, when I'm shifting gears, or let off the gas at lower rpms
Its weird to me

I'm getting it rebuilt and should get it back soon, but if it keeps smoking the way it is what else could cause this?

OkiDori17 · 10-24-2013, 11:05 AM

It's a t25 turbo
It's oil and water cooled
The smoke is blue-ish in color but smells sweet?
I took off my hot pipe and there is oil in there so I'm suspecting the turbo to be going.
It only smokes at idle, when I'm shifting gears, or let off the gas at lower rpms
Its weird to me

I'm getting it rebuilt and should get it back soon, but if it keeps smoking the way it is what else could cause this?

AZRB20 · 10-24-2013, 11:07 AM

Could be maybe valve stem seals, Does it smoke at a stop when you take off then go away?

Hatemy7 · 10-24-2013, 11:08 AM

I was ready to say that it sounds like your turbo

OkiDori17 · 10-24-2013, 11:28 AM

Turbo did have some shaft play that and the oil in the hot pipe is what lead me to believe it was that.

It does smoke at stop and when I take off it does go away, but as soon as the rpms drop it starts to smoke again. Ill check them out as well.

Question...are SR and KA valve stem seals the same? I have a brand new set of SR ones and if they're interchangable then ill go ahead and change those out this weekend.

AZRB20 · 10-24-2013, 11:37 AM

Not sure if they are, but I do know you can get some fel-pro ones for cheap at local autoparts store. I had to get mine replaced so that's why I'm familiar with the issue.

OkiDori17 · 10-24-2013, 11:48 AM

It won't hurt to go ahead and change them out, I doubt they've ever been changed and the motor has 240k+ miles
Ill knock that out this weekend.
I just hope it fixes it. I'm tired of blowing through oil, as well the nice looks people give me at redlights.

Thanks guys

AZRB20 · 10-25-2013, 10:04 AM

Quote:

Originally Posted by OkiDori17

It won't hurt to go ahead and change them out, I doubt they've ever been changed and the motor has 240k+ miles
Ill knock that out this weekend.
I just hope it fixes it. I'm tired of blowing through oil, as well the nice looks people give me at redlights.

Thanks guys

good luck man, definitely resolved my embarrassing problem haha.

10-21-2013, 04:29 AM	#1
OkiDori17 Zilvia Junkie Join Date: Jan 2011 Location: Columbus, GA Posts: 373 Trader Rating: (6) Feedback Score: 6 reviews	KA-T smoking What's going on guys. So I've searched and searched and can not come to a conclusion why my car keeps smoking the way it is. I had a ton (9+) vacuum leaks when I got the car. I removed my intake manifold and replaced all the lines and routed them the correct way (last owner had no clue what he was doing). Did a boost leak test, that was good. Compression test, that was good. Leak down test, that was good. Now it doesn't always smoke. Only usually after sitting at idle or low rpms for awhile. Can't 100% tell if it's oil or coolant, possibly both. Any help as to where to look next will be appreciated. __________________ '92 240sx w/'93 SR Blacktop /// '94 RX7 FD3S /// '11 370z RIP

10-22-2013, 07:36 PM	#2
motteramm Leaky Injector Join Date: Feb 2012 Location: Dallas, Texas Age: 30 Posts: 140 Trader Rating: (0) Feedback Score: 0 reviews	If you don't have a water line running in your turbo, could be oil burning up inside the turbo, or it could be oil going through your intercooler piping that is getting sent into the combustion chamber after you get on the gas. Do you have an oil catch can? And what turbo are you running? __________________ "I have no cupholder"

10-24-2013, 11:04 AM	#3
OkiDori17 Zilvia Junkie Join Date: Jan 2011 Location: Columbus, GA Posts: 373 Trader Rating: (6) Feedback Score: 6 reviews	It's a t25 turbo It's oil and water cooled The smoke is blue-ish in color but smells sweet? I took off my hot pipe and there is oil in there so I'm suspecting the turbo to be going. It only smokes at idle, when I'm shifting gears, or let off the gas at lower rpms Its weird to me I'm getting it rebuilt and should get it back soon, but if it keeps smoking the way it is what else could cause this? __________________ '92 240sx w/'93 SR Blacktop /// '94 RX7 FD3S /// '11 370z RIP

10-24-2013, 11:05 AM	#4
OkiDori17 Zilvia Junkie Join Date: Jan 2011 Location: Columbus, GA Posts: 373 Trader Rating: (6) Feedback Score: 6 reviews	It's a t25 turbo It's oil and water cooled The smoke is blue-ish in color but smells sweet? I took off my hot pipe and there is oil in there so I'm suspecting the turbo to be going. It only smokes at idle, when I'm shifting gears, or let off the gas at lower rpms Its weird to me I'm getting it rebuilt and should get it back soon, but if it keeps smoking the way it is what else could cause this? __________________ '92 240sx w/'93 SR Blacktop /// '94 RX7 FD3S /// '11 370z RIP

10-24-2013, 11:28 AM	#7
OkiDori17 Zilvia Junkie Join Date: Jan 2011 Location: Columbus, GA Posts: 373 Trader Rating: (6) Feedback Score: 6 reviews	Turbo did have some shaft play that and the oil in the hot pipe is what lead me to believe it was that. It does smoke at stop and when I take off it does go away, but as soon as the rpms drop it starts to smoke again. Ill check them out as well. Question...are SR and KA valve stem seals the same? I have a brand new set of SR ones and if they're interchangable then ill go ahead and change those out this weekend. __________________ '92 240sx w/'93 SR Blacktop /// '94 RX7 FD3S /// '11 370z RIP

10-24-2013, 11:07 AM	#5
AZRB20 Leaky Injector Join Date: Aug 2008 Location: Arizona Age: 36 Posts: 109 Trader Rating: (1) Feedback Score: 1 reviews	Could be maybe valve stem seals, Does it smoke at a stop when you take off then go away?

10-24-2013, 11:08 AM	#6
Hatemy7 Zilvia FREAK! Join Date: Mar 2008 Location: Chicago Il Age: 38 Posts: 1,367 Trader Rating: (0) Feedback Score: 0 reviews	I was ready to say that it sounds like your turbo

10-24-2013, 11:37 AM	#8
AZRB20 Leaky Injector Join Date: Aug 2008 Location: Arizona Age: 36 Posts: 109 Trader Rating: (1) Feedback Score: 1 reviews	Not sure if they are, but I do know you can get some fel-pro ones for cheap at local autoparts store. I had to get mine replaced so that's why I'm familiar with the issue.

10-24-2013, 11:48 AM	#9
OkiDori17 Zilvia Junkie Join Date: Jan 2011 Location: Columbus, GA Posts: 373 Trader Rating: (6) Feedback Score: 6 reviews	It won't hurt to go ahead and change them out, I doubt they've ever been changed and the motor has 240k+ miles Ill knock that out this weekend. I just hope it fixes it. I'm tired of blowing through oil, as well the nice looks people give me at redlights. Thanks guys __________________ '92 240sx w/'93 SR Blacktop /// '94 RX7 FD3S /// '11 370z RIP