White Smoke

[GSX Running]

I just bought a 90 hatchback with a SR swap, and have been driving it for a couple of days now. It just started to white smoke, but it only white smokes when I shift gears. Its doesn't do it when I'm driving, and it does it at all RPMs whenever I shift. It doesn't matter how fast, or how high of RPM's, it just blows a good 2-5 sec puff of white smoke when I shift gears. Any advice on what might cause this will def help

[chibo]

Could be a headgasket, what is your oil like? Coolant missing? Is there a way you can find out what it smells like?

It could also be oil burning, though that shouldn't be white... in which case it could be turbo seals or oil rings.

Does it also do it when you drop into neutral from gear or revving and letting off in idle?

[S14DB]

What BOV?

[chibo]

What BOV?
I was thinking that too, but it would be a quick puff of black smoke...

[GSX Running]

I thought about a head gasket, turbo seals, and oil rings, but then thought if it was any of those it would be doin it all the time instead of just when I was shifting. Car has about a half of qt of oil too much I think, was wondering if that would do it or not. But didn't think it would. Oil looks pretty good and everything and gonna do a oil change tomorrow with royal purple anyway. What do ya reccoment 10-30 or what?

[chibo]

I thought about a head gasket, turbo seals, and oil rings, but then thought if it was any of those it would be doin it all the time instead of just when I was shifting. Car has about a half of qt of oil too much I think, was wondering if that would do it or not. But didn't think it would. Oil looks pretty good and everything and gonna do a oil change tomorrow with royal purple anyway. What do ya reccoment 10-30 or what?
If it's overfilled it could come through as blowby... possibly explaining the smoke. The on shift thing has me though.

[GSX Running]

Also here is a full list of mods

SR20DET Red Top
HKS super sequential blow off valve
255 Walbro fuel pump
550 drop in fuel injectors
300zx MAF
stage 3 Greddy intercooler
2005 Greddy turbo timer
2005 Greddy boost controller
Tein springs
KYB AGX shocks
Full Greddy piping
Boost gauge
Big face Tachometer(taken off of dash!)
Full custom 3 1/2 '' T5 exhaust
Magna Tubular Manifold
Electo-lite radiator fan
S13 silvia front end clip
S13 aero front bumper
S13 3 projector headlights
Super Advan racing rims
kumo tires
front and back strut bars
HKS ecu

[GSX Running]

yeah thats what really threw me, if it was overfilled it would smoke all the time just not when shifting

[chibo]

Mind pulling the plugs and telling us what they look like?

[GSX Running]

will do later today

[s13speeddrft]

Couldn't white smoke also mean unburnt fuel coming out. Mine did that and i could actually smell the fuel.

[S14DB]

Couldn't white smoke also mean unburnt fuel coming out. Mine did that and i could actually smell the fuel.
Yeah, Unburnt RAW fuel is white. partially burnt is black.

[GSX Running]

so ur saying its getting to much gas, I guess I need to turn it down or turn up the boost? If it was that, that might explain why it was only doin it when I shifted

[Leetheslacker]

its probably the open dumped bov, its letting air out inbetween shifts when the afm and ecu still think its going into the motor.

[GSX Running]

o ok I am taking it to a performace shop in memphis to have them check it out, I checked the BOV and it looks good. So I don't know, then thought it might be a turbo gasket since I'm on the stock T25. But will figure it out in a couple of days

[GSX Running]

anybody else have any guess on this

[S14DB]

When did you tune the car?

[mitdrx]

I think it is the unburnt fuel. I have seen a few cases where people ran ssqv uncirculated and it ran fine. But most people recirculate. I also notcied that you had hks ecu. Is that JDM or Usdm that could play a factor.

[mitdrx]

I experienced a problem almost identical. I had changed my injectors. The fuel was only showing up between shifts because I was off the gas. Anyways one of my o-rings on the injectors was bad and it was dumping fuel. And it really showed up in between shifts.

[S14DB]

I think it is the unburnt fuel. I have seen a few cases where people ran ssqv uncirculated and it ran fine. But most people recirculate. I also notcied that you had hks ecu. Is that JDM or Usdm that could play a factor.
USDM? :ugh:

[chibo]

USDM? :ugh:
:rofl: Ah...

[mitdrx]

Yes USDM, meaning did he get it here from hks usa (maybe a hookup) or maybe he got a jdm ecu from ebay that is not tuned for our gas.

[GSX Running]

Well thinks everybody its at the shop now, and were looking into it, why I'm here I changing turbos, inj. building the head, and putting an AEM on it so I can prob run the car.

[GSX Running]

I think it might be a blown head gasket, because now when I drive it its smoking more and more. Don't know just more white smoke when shifting than before. Plus was mid revving and standing still and it was smoking then also.

[Neejay]

What color is your oil?

[GSX Running]

The oil is a light brown

[GSX Running]

Could be a headgasket, what is your oil like? Coolant missing? Is there a way you can find out what it smells like?

It could also be oil burning, though that shouldn't be white... in which case it could be turbo seals or oil rings.

Does it also do it when you drop into neutral from gear or revving and letting off in idle?


It does now do it while revving and letting it off in idle

[Neejay]

The oil is a light brown
As in a coffee with cream? Headgasket.

When coolant and oil mix, it becomes milky looking. :(

[all stock]

bad exhaust valve seals can cause white smoke too.