I can't really pinpoint the reason my car is smoking. It only smokes after the car warms up and then sits at idle. I'm pretty darn sure its oil burning and I thought it was valve stem seals but everybody who talks about valve stem seals says they only happen on cold startup. I dont smoke at all while driving and none on cold startup, only warm idle. Any ideas? :1zhelp:
Cause of smoking?
- Thread starter inline6
- Start date
inline6 said:
1st gen or 2nd gen motor? if you still have the stock pcv valve and hose, that might be your problem. I had the same problem, dropped in an oil catch can and smoke free ever since then.:icon_bigg hth
link:
http://www.supraforums.com/forum/showthread.php?t=143293
Yea I have the second gen, and I just replaced the pcv valve with a 2j one but it didnt help. Can you explain or show a pic of how you routed your catch can hoses. Theres seems to be a ton of debate on how to route those on the jz. Some people leave the intake side alone and only run on the exhaust side while others seem to connect both. Thanks.
inline6 said:
I've actually tried both routes, and what worked for me* was just routing the catch can on the exhaust side and leaving the inake side alone. I* got more smoke from routing it on both sides. Damn those debates, only way of knowning what will work for your* car is testing it out. Everybody has different set-ups, let us know how it turns out.
Mine smokes the same way. I have the 1st gen PCV system but I know that's not the problem because if I take the intake pipe off there's no oil residue. I think that we both just need to come to terms with the fact that it's the turbo seals.
I was having the same issues...when I pull my intake off I can see alot of oil sitting right where the hose connects from the pcv. I thought the same thing but also valve stem seals would throw out even more smoke when you rev it off of idle, rings would smoke non-stop. The issue I was facing didn't share any traits with either possibility...then I pulled my intake off and saw the oil.
Smoking is bad for you!( I quit!) My supra on the other hand has the exact symtoms you are having. I dont have the money for a big single but wouldent be depresed if I had no choice. Let me know how you make out. For now Im just leaving everyone in a smoke screen at stop lights or when timing down. No problems when driving. :dunno:
i would say your turbo seals are bad and mine was doing the same thing and i bught a set of used ones and had them rebuilt and am also going to have the olds ones rebiult so then i have a second set on hand when i need it also the second set is going to be betting ball bearings on them.
I'm certain it's turbo seals. I don't have any visible blow-by in the intake. My 7M had crap valve seals and a new turbo and it only smoked on cold start-up. My 1JZ, like others, smokes at warm idle. With the valve seals, the oil pools on top of them and burns off when you start the car. With the turbo seals, the oil leaks past as soon as it warms up and thins out. You don't notice it when driving because more exahaust is flowing and the car is moving. When you come to a stop and idle though there isn't much exhaust to dilute the smoke and the car isn't moving to dissipate it.
Edit: oh and also the oil pressure is higher at idle <-- nevermind I said that, I don't know what I was thinking
Edit: oh and also the oil pressure is higher at idle
<-- nevermind I said that, I don't know what I was thinkingWhere did you get them rebuilt and about what did it cost?trdmk3supra said:
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mobes said:I'm certain it's turbo seals. I don't have any visible blow-by in the intake. My 7M had crap valve seals and a new turbo and it only smoked on cold start-up. My 1JZ, like others, smokes at warm idle. With the valve seals, the oil pools on top of them and burns off when you start the car. With the turbo seals, the oil leaks past as soon as it warms up and thins out. You don't notice it when driving because more exahaust is flowing and the car is moving. When you come to a stop and idle though there isn't much exhaust to dilute the smoke and the car isn't moving to dissipate it.
Edit: oh and also the oil pressure is higher at idle
Where did you get them rebuilt and about what did it cost?
I thought maybe it also was diluted by driving but when i do stop it takes a good 20-30 seconds minimum to start smoking and sometimes wont smoke at all, but when it does its pretty bad. And I thought oil press went up while driving. And as far as fixing this, I'll start with a catch can, then valve stem seals when my crower cams come in from the GB on sf, then a single if the other stuff doesnt help. Not really ready to go single but i guess shit happens.
Oh! and this is kinda out there but is there any possiblity of it being caused by other fluids. I've read if certain seals go bad things like the PS fluid or brake fluid can be sucked into the intake under vacuum but I dont know about that stuff for sure. What color would PS fluid burn anyway?
mobes said:I'm certain it's turbo seals. I don't have any visible blow-by in the intake. My 7M had crap valve seals and a new turbo and it only smoked on cold start-up. My 1JZ, like others, smokes at warm idle. With the valve seals, the oil pools on top of them and burns off when you start the car. With the turbo seals, the oil leaks past as soon as it warms up and thins out. You don't notice it when driving because more exahaust is flowing and the car is moving. When you come to a stop and idle though there isn't much exhaust to dilute the smoke and the car isn't moving to dissipate it.
Edit: oh and also the oil pressure is higher at idle
Where did you get them rebuilt and about what did it cost?
yo man i had mine rebuilt by a shop in utah and will have to get the info for you.
Nevermind what I said about oil pressure, I don't know what I was thinking.inline6 said:
Brake/clutch fluid wouldn't ever be sucked in. Power steering fluid could in theory if the idle-up valve is damaged. It would burn white. If you have PS fluid in your vacuum lines going to the PS idle up then I'd suspect that. I've never seen one do that though so I wouldn't suspect it.
trdmk3supra, I'm anxiously waiting
deffinetly turbo seals if the smoke is white. happened to me when i blew my turbo every stop light thick white smoke and only when warm at idle i used to stop at stop lights and bring the engine up to 1500-2000 rpm so it wouldnt smoke.