SaabGuy

OK so I just got through doing a bunch of mailtenence stuff such as new exhaust, rear end work, oil chaged and routed a missing vacuum line.

Did I do somehting wrong here?

Before I did the maintenence the car only puffed a bit on cold startup and sometimes not at all.

The maintenence project took about 3-4 weeks and I did the following.

Drained the oil over night and didnt start the engine until about 2 weeks later with fresh oil. Hope I didnt starve any seals.

I'm premixing, so I put in Mobile 1 15w50, over filled according to the line, by about 1/3 an inch. Maybe this causes engine smoke?

I found a vacuum nipple uncapped which looked like it was spewing a slight ammount of oil located at the very bottom of the filler neck. According the the vac diagrams this nipple usually goes to a Purge Control Valve and then routes to two parts of the intake. I dont have a purge valve so I simply plumbed this open nipple from the bottom of the oil filler neck to the TOP of the oil filler neck as that nipple was simply capped off before. (I REALLY hope this is my problem but it kinda looks unlikely.)



I did find a fairly heavy oil leak on the turbo return line at the front of the engine but that was simply dripping straight down. I'll need a replacement flange for the return line and a gasket. I dought this caused the problem. FUnny thing though this wasnt leaking before. THe return line's flange cracked wide open.

I changed all the spark plugs.

Lets see what else... Oh this engine was rebuilt about 2-3 years ago. Idles dead smooth even when smoking. COld starting is tough due to tuning, but honeslty the car didnt smoke much at all until I started moving, at which point it smoked pretty much constantly.

Please help!!

rx-7 obsessed

what color is the smoke?

SaabGuy

Blueish white. Smells like oil. No coolant smell at all. Its oil I'm 100% sure of it.

I was just reading up on how if the engine gets internally pressurized, oil can be pushed by the oil control rings. I'm thinking what I did with the above vacuum line might have casued the problem so I'm gonna get some one way valves and put together some kind of suction for the two nipples on the filler neck. My fingers are crossed at this point but I know for a fact the engine was fine and dandy before I did the above maintenence. I'm just thinking it HAS to be somehting I did.

As for the lower turbo oil return line, I've got some JB weld curing at the moment. I dont want to buy anything until I fix the oil burning issue.

SaabGuy

Fotrune smiled on me tonight!! Rotary gods gave me a break on this one.

I disconnected that hose I circled from my thread starting post. <- Not 100% sure if this helped but it could have

Started her up, no smoke. Went for about a 20 mile drive, and only puffed one time when I left my driveway.

I'll Chalk this one up as either the above vac line, or just sitting for a little too long with out oil circulating.

I'll give this one a go for now. 12.5 psi and running strong. >rear end is fixed too!

jacobcartmill

iTrader: (6)

both of those PCV ports should get fresh air, preferrably filtered. if the PCV is blocked, the engine will pull oil through the oil control rings and into the combustion... you can take your finger and plug that PCV port on the middle iron (that you have circled at the base of the oil filler neck) and it will start smoking, take your finger off and it will go away.
yours was smoking because you connected a hose between the two ports, essentially "capping" both of them off.
i'd personally get a nice catch can and run both those breather ports to the catch can, as catch cans usually have a nice little breather filter on them

BTW this is my old car btw guys.


/end thread