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Post #1
 10th October 2010 - 10:32 PM
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hey guys. I have a 1991 180sx with a SR20DET motor. Car has done 120 000kms. I have a issue when my car engine is cold. I have owned the car for the last 20 000kms and the last couple of months it has been blowing a bluish white smoke upon start up but only when the motor is cold. The car kicks over fine, then after about 5-10 secs (earlier if i rev a little) it blows a bluish white smoke. (which i have noticed is worse on some days than others). on some occasions if I leave home early enough, by the time i reach the corner the motor wants to stall. it only happens when cold. I have spoken to a few people regarding this, some of their responses are: 1. cold start injector (already ran a injector cleaner multiple times with no avail) 2. coolant temp sensor (not replaced yet, but was told the smoke would be black not a bluish white) 3. FAINT chance of bad plugs (not checked yet) 4. valve stem seals are rooted... (sounds fun!) has anyone had any similar issues to this and/or other possible fixes. thanks in advance! any responses are appreciated. EDIT: I have run some stop smoke etc through the motor also to no avail. This post has been edited by dedseayak: Oct 10 2010, 10:52 PM |
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Mongrel
Post #3
if it's blueish smoke on start-up/throttle opening then I'd be putting money on valve stem seals. |
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t66vlwagon
Post #4
[quote name='dedseayak' date='Oct 11 2010, 04:32 PM' post='1286519580'] |
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dedseayak
Post #5
QUOTE (Mongrel @ Oct 11 2010, 05:18 PM)  if it's blueish smoke on start-up/throttle opening then I'd be putting money on valve stem seals. double check: when warm(after the initial smoking has stopped), leave the car idle for a minute or two, then snap the throttle wide open. if it puffs blueish smoke then it's defiantly valve stem seals. It's a bit time consuming, but it's not a overly difficult job to do in-car on a rwd SR......if you've got the right tools thanks for the reply. I shall check that out and see what happens. 
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iamhappy46
Post #6
1. The SR20DET does not run a 'Cold Start Injector' although I can only assume they mean the IACV(Idle Air Control Valve) but that would not cause your symptoms |
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dedseayak
Post #7
QUOTE (iamhappy46 @ Oct 11 2010, 09:03 PM) 1. The SR20DET does not run a 'Cold Start Injector' although I can only assume they mean the IACV(Idle Air Control Valve) but that would not cause your symptoms 2. Coolant Temp Sensor can play up but will affect driveability regardless of engine being warm or cold. The CTS is not the sensor on your dash and I find on 15+ year old SR20's that it is worthwhile replacing it anyway for better fuel economy 3. Unlikely. 4. As above.... likely. Option 5. Check your turbo to intake manifold piping and intercooler for oil residue. Option 6. Check the PCV in the rocker cover is not causing issues with the valve stem seals  ok... the problem has worsened. It now smokes almost the whole time. So, the car is now garaged indefinitely. I have a suspicion that it is the turbo seal. This is what 2 people have told me (local autobarn store where the owner is a mechanic) they saw me pull up to the lights with a blue cloud following. They mentioned that when i hit boost it overflows the oil past the seal and into the exhaust (something along those lines). I drove the car home not allowing any boost to spool, and had next to no smoke... ? I have checked the intercooler piping and there is next to no residue. There is however a large amount of residue in the Air intake pipe.. does this sound like a turbo seal. I have found rebuild kits on ebay for the t25 garrett turbos. for around $90 delivered. This seems alot cheaper than the possibility of a new turbo. I currently have half to car pulled apart (no air intake, no intercooler piping, most vacuum hoses removed etc) so no engine test is possible without fitting it all back. Anyone with their thoughts? |
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iamhappy46
Post #11
PCV takes oil vapour from the head and lets the vacuum between the airflow meter and the turbo 'suck' oil vapour into the motor. Its normal for this to happen unless the engine has damage, then it sucks in a LOT of oil. |
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Mongrel
Post #12
QUOTE (dedseayak @ Oct 18 2010, 12:24 PM) ok... the problem has worsened. It now smokes almost the whole time. So, the car is now garaged indefinitely. I have a suspicion that it is the turbo seal. This is what 2 people have told me (local autobarn store where the owner is a mechanic) they saw me pull up to the lights with a blue cloud following. They mentioned that when i hit boost it overflows the oil past the seal and into the exhaust (something along those lines). I drove the car home not allowing any boost to spool, and had next to no smoke... ? I have checked the intercooler piping and there is next to no residue. There is however a large amount of residue in the Air intake pipe.. does this sound like a turbo seal. I have found rebuild kits on ebay for the t25 garrett turbos. for around $90 delivered. This seems alot cheaper than the possibility of a new turbo. I currently have half to car pulled apart (no air intake, no intercooler piping, most vacuum hoses removed etc) so no engine test is possible without fitting it all back. Anyone with their thoughts? The autobarn explanation sounds like shit dribble. Oil entering the exhaust side of the turbo vaporizes and goes white. If it was turbo related, then it would be from the comp side and the inlet tract(intercooler) would have oil in it. Oil build up on the intake pipe(section between MAF and turbo) is normal as under wide open throttle, the manifold is pressurized so the PCV closes. Any crankcase pressure is vented through to the intake pipe. I'd be checking the PCV valve first(drives side rear of the rocker cover), it may be stuck open and pressurizing the crank case. this causes all sorts of oil control problems but this usually has the dipstick firring out every time you hit boost. Separated baffle plates in the tappet cover could also be a possibility, they are riveted in place, but have sealant around them....this usually happens after people remove them, clean them and paint them. The sealant become soft/fall out and the baffle can allow oil to be picked up and blown out the PCV/breather ports. other than that....engine damage. |
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