Smoking Problems

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Drifterxxl
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Car: 95 S14
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Ok any who can help please, this is the problem when driving below 4k rpms there is no smoke, but when ever you get high than that the motor starts to smoke( white smoke). What are the possible causes the swap has been done for a while but started smoking just recently. The swap is basic just all stock sr please help?


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KingTurd
Posts: 55
Joined: Tue Jun 19, 2007 1:09 pm
Car: 1991 240sx w/ sr20det
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White smoke = coolant (or condensation). First things first--try a compression test. Could be a head gasket, or something else. Maybe the turbo is leaking/burning water? Not sure if its possible or not, but the head gasket is definitely a start.

I remember once my friend put a cold air intake on his ford probe. For some reason after he put it on, there was white smoke coming out the back. Head gasket was fine. I am not exactly sure why it happened or why im posting this here, but it just goes to show it could be other things.

Drifterxxl
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On the SR where should the compression be at?

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KingTurd
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zerothread?id=47377

5th post down. Your concern here might be the difference between two cylinders, since it might indicate a bad head gasket. However im no mechanic Go rent one from Autozone or Advance and give it a shot.

Drifterxxl
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I'll try that and see if thats the problem. Thanks

doridori23
Posts: 271
Joined: Wed Jun 13, 2007 11:43 am
Car: 1996 SR20deT 240sx (mine) , 1998 KA24de (wife's)

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KingTurd wrote:White smoke = coolant (or condensation). First things first--try a compression test. Could be a head gasket, or something else. Maybe the turbo is leaking/burning water? Not sure if its possible or not, but the head gasket is definitely a start.

I remember once my friend put a cold air intake on his ford probe. For some reason after he put it on, there was white smoke coming out the back. Head gasket was fine. I am not exactly sure why it happened or why im posting this here, but it just goes to show it could be other things.
Slow down there. White smoke that instantly dissipates is coolant. It will also have a very distinctive odor to it (think of burnt marshmallows mixed with the normal coolant smell).

However white smoke that does not instantly dissipate is due to a lean condition. pull your spark plugs and if you see an overly white porcelin with a white powdery substance your running very lean.

Your compression should be higher than 130 up to 175. If the motor is cold it will be closer to 130 as the rings might not be completely seated. All cylinders should be within 15psi of each other regardless of the pressure they pump up to.
Modified by doridori23 at 12:28 PM 7/17/2007

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silk240
Posts: 360
Joined: Mon Nov 20, 2006 4:08 pm
Car: '92 white 240sx coupe w/ blacktop sr20det

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^^^ he said it all

Drifterxxl
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The white smoke does not discipate so i should figure that i'm running lean. Will check out in the morning have had the problem of blowing a coil pack apart?

doridori23
Posts: 271
Joined: Wed Jun 13, 2007 11:43 am
Car: 1996 SR20deT 240sx (mine) , 1998 KA24de (wife's)

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You had a coil pack blow apart? I want to see that I have seen them burn up or go dead but not blow-up!

Depending on how bad the situation is you can either lower your boost pressure, replace the fuel pump with a walbro, get an adjustable FPR, or new injector set. The FPR bump will help a little bit but if it is that bad you will need new injectors/pump. I would lean towards the pump first as it is the most common and cheapest part to change first ($125 shipped).

Drifterxxl
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The car is running leaning so have ordered the new fuel pump and FPR. When I said the coil blew apart not blew up no explosion just separated from the base.


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