Still can't figure out these issue's..

[Turbo Habanero]

Ok so car has been having three issue's that i can not seem to fix.
I greatly appreciate any help as this problem has been really confusing and makes me want to tear my eyes out at times

Only known codes ive been having trouble with are 41/71 they come and go i can clear the codes and they wont come back for a month sometimes they come back in 100miles.

#1 Oil burning only on decel when the car returns back to stable idle it will send out a puff of smoke.

Most have said it was valve stem seals (Has my head completely redone by a machine shop 7,500miles are so ago)

Find a big downhill, hit it at speed closing the throttle on the way down, if it's stem seals soon as you open the throttle again you'll see smoke, helps if you have someone follow to confirm.

I had tried what Ian said quite a few times and i did not see smoke anytime when i opened the throttle just as i came to a complete stop and RPMS were returned to idle.

Also have done a compression check

#1 - 154
#2 - 152
#3 - 155
#4 - 149
#5 - 151
#6 - 157

Only oil leaks i have are my valve cover gaskets.

Problem #2 Vacuum on boost gauge only reads -15/16psi at idle -20/21psi driving

Searched and searched with Brake clean and Carb Clean couldn't find any leaks.
Replaced the throttle body gasket any ways.

Problem #3 I am Lean at idle 16.3-16.7

My 02 sensor is wired correctly
not sure if the sensor is bad itself but the car is fine while driving 14.7-15.5

First video Shows some throttle body issue (As you can see its like my trottle body isn't all the way closed as i pull in it the idle drops)and Exhaust Smoke
[video=youtube;VsJOcmVxyTA]http://www.youtube.com/watch?v=VsJOcmVxyTA[/video]
2nd video shows Vacuum and AFR's at idle
[video=youtube;G2hi8yEk8tk]http://www.youtube.com/watch?v=G2hi8yEk8tk[/video]

 

[radiod]

Judging from the first video, my car does a similar thing with a little bit of smoke out the exhaust when stabilizing idle, but your's is definitely more blue than what I get. I asked a bunch of reputable mechanics that are local here that I trust and they all agree that mine is just some unburned gas. Mine definitely smells like fuel and not oil, so unfortunately though similar, it doesn't seem to be the same issue . With my cat in place in the car, I don't see it or smell it at all, and I just went through AirCare (smog, emissions, whatever you want to call it) and passed with very low readings, WELL below average pass readings not to mention the pass threshold.

Your vacuum does seema little low for idle. What kind of vacuum does it pull on a decel, in gear down a hill @ 2.5k - 3k rpm? What is your elevation? If you're having issues finding the leak under vacuum, you could always try doing the DIY boost leak test. If it leaks under negative pressure, chances are you'll find it pretty quick under positive pressure as well.

 

[GrimJack]

The vacuum at idle and lean at idle is pointing to a vacuum leak. I'll second the idea of doing the DIY boost leak tester.

 

[Turbo Habanero]

Vacuum While driving is 20-21

I live in tucson az. elevation is 2589ft

 

[Turbo Habanero]

Seems at idle if i give it alittle gas and let off vacuum goes to -22 then back to 15-16

 

[shipkiller]

15-16 is a vaccuum leak, check the pcv hoses and system, most of the time you find the culprit there

 

[jonahs_supra]

#1. i suspect the oil rings to be bad
compression tester will only show what shape the compression rings are in
have you tried a different sensor for the wideband?
seems your running rich on decel which will cause smoke(yes sometimes it will look blue)

#2. vaccum should be right around 20inch vaccum
do as others said and make/use a boost leak tester

here is what i would do
check for boost leaks(im sure you have some)
boost leaks will make you run rich and crackle on decel(like your car is doing)
see if a friend will let you borrow his wideband sensor for a quick test

 

[Turbo Habanero]

#1. i suspect the oil rings to be bad
compression tester will only show what shape the compression rings are in
have you tried a different sensor for the wideband?
seems your running rich on decel which will cause smoke(yes sometimes it will look blue)

Any other way to make sure its not piston related other then a compression test? and im not losing enough oil to notice yet on the dipstick

I am running rich when i let off the gas cause i have a vented BOV when i release gas it jumps down to 10's and 11's then up to 16 and 17's AFR's untill i give it gas and back to normal steady throttle is 14.5-15.4

#2. vaccum should be right around 20inch vaccum
do as others said and make/use a boost leak tester

i need a air compressor

here is what i would do
check for boost leaks(im sure you have some)
boost leaks will make you run rich and crackle on decel(like your car is doing)
see if a friend will let you borrow his wideband sensor for a quick test

I have to wideband sensors there's one on my other car i switched awhile back when i first started having the problem same readings.

I'm starting to think that it could be the seal on the BOV flange (snap ring)
But if the throttle body is closed how would there be a vac leak in the intercooler lines?

 

[jonahs_supra]

throttle body will never be 100% closed
there is a very small gap between butterfly and TB housing
this lets air in for your car to idle
you pulling on the throttle linkage is only making the gap smaller and letting less air in

if you know how to make a boost leak tester then make 1
instead of installing a quick connect fitting drill a hole and install a tire valve stem
go to a gas station lol
install tester
have a buddy watch boost gauge
apply around 8psi of boost
now listen for leaks

heres a good link of how to make a boost leak tester incase you dont know how
http://www.youtube.com/watch?v=atretf9u-Mc

im going to lean more towards its not oily smoke...
thinking its unburnt fuel

---------- Post added at 10:37 PM ---------- Previous post was at 10:36 PM ----------

also my bov is vented to atmosphere and i have no problems running rich after decel to idle

 

[Turbo Habanero]

Could this be my problem lol. this is my #6 cylinder with the plug still in it

 

[jonahs_supra]

wow lol
gotta love the 7m valve cover gaskets lol
im suprised it wasnt sputtering real bad and misfiring

deffinetly suck up the oil, change plugs, change wires and replaced valve cover gaskets
allthough i dont think its going to cause the issue you having

im sure somebody in your town with a turbo car has a boost leak tester

but the above pictures is just typical maintenence lol

---------- Post added at 11:15 PM ---------- Previous post was at 11:14 PM ----------

just read you sig info
have you tuned the safc yet?
after finding/fixing boost/vaccum leaks and fixing valve cover gaskets i would try to tune with safc(if it hasnt been tuned yet)

 

[Turbo Habanero]

Just street tuned myself. at a good 11.3-11.7 WOT all the way through gears

But is it possible the oil could get through the threads and down onto the plug and be burning off the oil.

Maybe i have a Bent Valve.

 

[jonahs_supra]

the odds of oil seeping down past the gasket and past threads is slim to none
think about it
you have 150psi compression
if oil is able to seep down(with no pressure applied) then cylinder compression would surely leak past the gasket and threads as well(causing low compression)

from the sound of your engine you dont have a bent valve
bent valve will cause a misfire/horrible engine performance/smoking bad
when you did the compression test then a cylinder with a bent valve will have no compression(depending on how bad its bent) or will have good pressure but will leak off fast

 

[Turbo Habanero]

oh its just something that popped in my head when i had my head redone the shop told me he had to replace 3 valves that were bent gave me the option to buy them or said he would. it was like 6 bucks a valve or something like that

 

[jonahs_supra]

i rewatched vid again
the backfiring i thought i heard was noise in the video recorder lol

ok so scratch the running rich part

still go with plans on replacing plugs, wires and gaskets
then check for boost leaks and give an update

i know my 3sgte would smoke like a freight train after a hard or mild rev
do to my turbo was bad
but mine smoked after about 10 seconds of idling

 

[Turbo Habanero]

car does back fire between shifts sometimes and on decel i get lot of poping and gurgling like back pressure.

---------- Post added at 08:42 PM ---------- Previous post was at 08:39 PM ----------

Another video i have of the issue might help

[video=youtube;dRyh9MJGv3w]http://www.youtube.com/watch?v=dRyh9MJGv3w[/video]

 

[Turbo Habanero]

ok upon soaking up and getting the oil out of that spark plug i took out the plug and there was oil on the threads.

 

[radiod]

Even after trying to soak it up first, I don't think you'd get everything and you very well could have just had it on the threads when taking it out from residual leftovers. I'd be more concerned if it came down past the threads and on to the end.

 

[Turbo Habanero]

Yeah the tip was dry.

 

[Turbo Habanero]

Ok so today i did new plugs and wires and valve cover gaskets. Problem as suspected still is present

But i noticed today after leaving the car idling for about 5 to 10min the car started to smoke it was hardly noticeable but it would give slightly bigger poofs every 20 seconds or so. still unless you were paying attention might not notice it But definitely there.

Also as of lately i have not noticed any on start up still can smell what i assume is oil or fuel sometimes. Be for i would see a poof of smoke come buy my car