My Tercel has been burning oil after going down a hill before it warm's up if I look in the rear view mirror all I can see is blue then it stop's and wont burn any more oil and I was looking at a different forum and I found this
I can think of two possible causes - either the PCV or the valve seals - if you're going downhill with the throttle closed, the vacuum builds up and sucks the oil through.
can anyone think of any other ideas and how would I stop it? I tryed going down with my foot on the gas the hole time seemed to work but when I get to the bottom I have to use my brakes to much and i'm going around 90km or more
I have same problem on 94 tercel, valve seals of mine leak, and cause white smoke when engine starts up after it has been standing thats valve seals, and then when i race engine, it gives off blue smoke, im guessing thats rings. To replace head springs, and valve seals u need to basicly take head OFF, remove timing belt, and such, so u basicly remove engine out of the car, which is a pain in the butt. I removed it and put it back that took like 10 days for me, now i relize i shouldve changed valve seals and rings inside pistons, well second time will be eaizer to take engine out.
As far as vacume, engine has vacume all the time, if there is fuel and air, and exhaust, this somehow creates PSI inside engine, its not vacume, vacume has NO AIR, this has air inside it but at different preasure then inside pistons or rest of engine. Only thing that could cause this kind of vacume leak is a CRACK inside the INTAKE or exhaust, or engine block. But u woulld get no power.
I hope that helps. Im not realy a pro, so if anyone else posts anytihng read theirs not mine.
__________________ 1993 Toyota Tercel 3EE - 45,000 Miles - Odometer 280,000
*Leaking gas, Leaking Coolant, Non functoning AC, Sagging DS door. NEW TIRES!
I found this on a different forum from the last one and it point's me to the same thing so if this is my proplem would I have to change the seal's to fix it. Descending a hill is a condition when the throttle is closed, intake vacuum is high, and combustion chambers cool down. Oil gets past rings, and especially past worn valve stem seals, and doesn't get much of a chance to burn off. When you level off and open the throttle, you're moving a lot more through the engine and the combustion temps go up, burning off the accumulation. Bingo, instant smokescreen.
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93 Tercel 5 speed
Last edited by 3ee4banger; 07-25-2010 at 11:14 PM.
Yah, only way to be sure is to get a full gasket set on ebay or something, and yank out motor and take it all appart, but u need so much time for this. Changing most stuff will requre special tools, like Valve Spring Compressor, Crankshaft pulley. U can rent most of this stuff at Advance auto parts, i rented em free. U just bring it back. Autozone might charge i dunno.
Also Since u mentioned rings, cheapest ring set i saw was on ebay, its a kit like 250$ or so, with pistons and rings and FULL GASKET set. I think also some sort of pump? Oil maybe?. I bet the steps involved to change it is eazier than Valve stem seals but u need to replace those damn Metal Plugs on the side of the main engine bay. Im not sure where they even sell em cheap.
__________________ 1993 Toyota Tercel 3EE - 45,000 Miles - Odometer 280,000
*Leaking gas, Leaking Coolant, Non functoning AC, Sagging DS door. NEW TIRES!
ok so I changed the PCV valve and it worked but then the car started burning oil again and it builds the oil up in the vacuum line for the PCV valve would there be some kind of seal in the valve cover that blew and keeps putting the oil in the air intake plenum from the PCV system?
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93 Tercel 5 speed
Last edited by 3ee4banger; 08-27-2010 at 01:02 AM.
Ok so this is how bad it got on my car I had know clue my pcv was pluged the only reason I replaced it was because I broke the old one any way I copyed this from a different website but this is how bad I let my engine get
If the PCV valve gets plugged, here's what happens, roughly in order:
Excess crankcase pressure begins to back up the engine's breather tube, into the intake air tube upstream of the throttle body
Engine management system senses absence of air from plugged PCV valve, and adjusts fuel mixture accordingly. Engine makes slightly less power.
Oil begins to be pumped into the air intake tube through the breather hose, upstream of the throttle plate.
Oil runs down the intake tube into the throttle body.
Oil sludges up the throttle body and throttle plate. Gas pedal starts to get sticky. Airflow reduced. Engine management adjusts mixture again. More power loss, possible poor driveability.
Idle Air Control (IAC or EACV) valve gets contaminated and begins to stick.
IAC cannot adjust idle air mixture to compensate for plugged PCV valve. Idle drops, may become erratic as throttle plate cannot close completely.
Oil drips into intake manifold runners. Blue smoke seen out of tailpipe.
Breather tube begins to get constricted from oil contamination and airflow is reduced. Crankcase pressure mounts dramatically.
Oil pushed past valve guide oil seals. More blue smoke.
Dripping on driveway as oil is pushed past seals.
The owner of the car before me had never gotten the oil changed well they owned the car
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93 Tercel 5 speed
Last edited by 3ee4banger; 08-27-2010 at 01:42 AM.
I found this on a different forum from the last one and it point's me to the same thing so if this is my proplem would I have to change the seal's to fix it. Descending a hill is a condition when the throttle is closed, intake vacuum is high, and combustion chambers cool down. Oil gets past rings, and especially past worn valve stem seals, and doesn't get much of a chance to burn off. When you level off and open the throttle, you're moving a lot more through the engine and the combustion temps go up, burning off the accumulation. Bingo, instant smokescreen.
It's actually a low-pressure area in the combustion chamber that draws the oil past the rings from the crankcase under deceleration. Upon acceleration, gas pressure/compression forces push the piston rings into the cylinder walls reducing blow-by. On deceleration, although the ECU cuts the fuel injectors for a time, because of its closed loop system, it also must ensure the catalyst doesn't cool down too much, so the injectors are pulsed during prolonged deceleration in gear (NOT neutral) - like going down hill.
On a healthy engine, the amount of oil drawn into the combustion chamber on deceleration is negligible. On engines with worn piston rings, oil consumption becomes a greater concern under deceleration. Oil seepage past valve seals will cause oil consumption roughly anytime during engine operation, but most notably during high oil pressures.
The baffles in the valve cover are also designed to reduce the amount of oil lost during PCV operation. It'd be a good idea to go to the junkyard and grab an extra valve cover for your engine, soak it in solvent overnight, clean it out, and swap it with your old, gunked up one. You could then do the same thing with that one. You wouldn't have to worry about a clogged PCV system after that, so long as you remember to change the valve now and again.
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1991 Toyota MR2 V6
Ported, rebuilt 3.0L 1MZ
Fully OBDII compliant and California smog legal
Last edited by Jason.MZW20; 08-27-2010 at 04:27 AM.
ok I found this video on youtube and this is what my car looks like for abouht 10 seconds after going down hill most of the time it dosent do it but sometimes it will and first start of the day sometimes it dosent do it very much but it bugs me and it dose it in cold weather it will never do it on a hot day
ok so I found this old video of my car and this was when the car was at its worst its only smoked this bad 5 or 6 times since I made this video it was a very windy day so it dosent look very bad in the video I made it 5 months ago
ya I think I will make one I seen one before really simple to make just a jar with marbles both hoses in the top the one from the valve cover at the bottom and the other one at the top
ok so I built it and in my jar i've got everything from the pcv getting filtered through water and marbles all the garbage that goes into the water over time the water will evaporate then you just pour fresh water in the jar and my engine is running like new
Glad that worked for you! I wonder why some similar type device doesn't come on cars in the first place. Seems like it would extend the engine life catching all the gunk.
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