This is a brand new rebuilt d16a6 motor, total bottom end is 100% new with new parts, the head is completely built and was previously used for 4500 miles and then slapped on my motor.

The car ran great for the first 3K or so Ive had it and just recently I noticed that after the car is fully warmed up and you go for a drive. Come to a stop or slow down hard, the car will kind of billow smoke. Not to heavy but enough to surround the car and into the cabin a bit.

Smelt like burning oil so I pulled the plugs, sure enough #3 was SOAKED, a good 1/2 teaspoon all up the threads and on the tip of the plug.

I did some research and found that the valve cover gromets like to fail on people, picked up a brand new set and threw em in, didnt work.

Now this problem doesnt seem to be constant, the car has gone a day before without smoking, but today it smoked at almost every full stop.

It will not smoke if you start the car up from cold and let it idle, no smoke at all.

Im lost on what it could be or how I could fix it.

 

it might be the piston ring. i had the same problem and it turned out to be that.

 

Check the O-rings on the underside of the valvecover that sit around where the spark plugs would be.

 

Valve cover gromets are new

 

bumpity

 

Well Theres oil on the dam threads of the spark plug, to me that mens its coming from the top.... right?

I did just replace the valve cover orings though so I cant see that being the problem, would teflon do anything there or would it just burn up?

 

bump, compression test and new valve cover will be done tonight

 

Is the oil only on the threads or is it on the tip also?

 

The piston ring prolly never sat correctly.

Do a compression or leak down and shows us some results.

 

My money is on the rings.

 

yeh they prolly werent offset right or gapped right....but if the threads are soaked it has to b the rings.....do a leakdown test, or even a wet compression test and itll tell u for sure....

 

you wouldn't be able to tell if it was on the bottom end - it would burn up, that's what's 'causing the smoke probably

It's either a spark plug seal or a piston ring in my diagnosis....that's just my opinion tho..but I wouldn't be all like "well I just replaced the piston rings, so it CAN'T be that" because it just MIGHT be.. - but that's your call

 

Yes I understand oil is getting in the combustions chamber, but if you read when it may change your mind where its coming from

If I start the car cold it will NOT smoke, when driving around under boost or vacuum it will NOT smoke. It only smokes OCCASIONALLY (about every 3rd time I stop) when i come to a hard stop and sometimes when just coming to a slow stop, once I start moving again, it goes away.....

Im going to do a compression test in 10 minutes

The motor was rebuilt with vitara pistons and eagle rods, head is fully built with aftermarket parts

 

Compression Test Results - 130 - 130 - 130 - 130

Damn that made me smile seeing those numbers , whether they mean something or not

I really would like to know how oil is getting all over my dam spark plug though

 

Did you do a leakdown?

 

Dont have a tester, so no. Cant get a tester, so no

 

could be valve stem seals too

 

Iwas told it couldnt be because it doesnt somoke all the time, only after a good drive and when coming to a stop for some reason

 

if it smokes only at a stop then thats exactily what it is because the low rpms at idle let oil between the valve stem and the bad seal....at uper rpms the valve is moving too fast for oil to pass

 

Hard to change? Why wouldnt it smoke on startup then? and why does the smoke go away after you sit at the light for a minute?

That diagnosis doesnt make sence

 

at start up there might not be enough oil pressure yet to cause leaking as for the smoke going away at a stop idk. dose it smoke at operating temp just crusing around or just at stops?

 

Ive got 60psi oil pressure on a cold cold start in the mornings, no smoke

Only smokes when coming to a stop, sometimes just before I stop I notice the could

 

Well I went out for a drive, I noticed that the car seems to smoke when the oil pressure is higher.... maybe that would be obvious?

But, like I said, it only smokes on hard decel and idle, when the car warmed up and idle pressure was under 25psi (around 23) the car didnt smoke at all, I did quite a few stops frequently just to check it out, didnt smoke once.

Maybe I should just lower my oil pressure significantly for a temp fix until winter when I can tear the motor apart? Wonder what I could do to get the pressure way day, if its feasible

 

bump it

 

No throttle wasnt open at all

UI would like to know if lowerring the oil pressure may help based on whats Ive found thouh