Smoke after Deceleration (Read for specifics)

[magnumP5]

Well it comes to this - I essentially have a MSP so that's why I'm posting this here:

Well adding about a quart of oil over the past two days (didn't fill it completely the first time I think) I think I may have finally found my culprit. As I was driving down the highway today I let off the gas completely because someone cut me off. After about 5-10 seconds I got back on the throttle to maintain speed (read: not WOT) and as soon as the throttle kicked back in I see a puff of smoke through my rear view mirror. Now me being paranoid I had to replicate the incident by repeating the above steps and sure enough - a puff of smoke every time. I could not however replicate this on the way back (weird).

So what's this appear to be? Symptoms include massive oil consumption and "puffing" smoke when returning on the throttle (read: not constant smoke, only "puff"). There appears to also be a decent amount of oil residue on the hatch (little black spots everywhere). So what does this appear to be: piston ring blown, bad valve seal, bad turbo seal? Any input would be greatly appreciated.

[2.0t03speed]

bump for joo

[DubbyDoo]

check compression on your cylinders easy thing to do if it isnt normal its prob piston rings or valve seals

[magnumP5]

check compression on your cylinders easy thing to do if it isnt normal its prob piston rings or valve seals
Yeah, if I can find someone with a compression checker I will probably do this. Is there any way to tell between the two based upon a compression check?

[DubbyDoo]

try goin to auto zone they may rent a compression tester out not sure, as for telling the two apart that im not sure about i doubt it but it will kinda give you an idea of whats happening

[magnumP5]

try goin to auto zone they may rent a compression tester out not sure, as for telling the two apart that im not sure about i doubt it but it will kinda give you an idea of whats happening
Yeah because there are also leak down tests but those are crazy expensive. I last had a compression test done back in August and it was 200 psi across all four cylinders.

[A louie]

Auto zone/advanced rents compression testers

[BOOSTR]

Sounds like its turbo related as opposed to internal or head issues. How often do you have to top off the oil?

[magnumP5]

Sounds like its turbo related as opposed to internal or head issues. How often do you have to top off the oil?
For the past few months, rarely. However, I just recently made a trip to OH (through WV and a lot of mountains so I was in boost a lot) and afterwards I was well over 1 qt short. I check my oil about once a week or so but this sort of consumption is unusual. Hopefully later this week I will be able to pull the first hot pipe to check for oil and get a compression test done.

[magnumP5]

Bump for more input.

[MSP608]

Lol yea when you mentioned your oil consumption the other day and how it smelled through the exhaust I was surprised you weren't smoking. Oh well, good luck finding the culprit.

[akinat90]

I have had a similar issue with my car. I presume that you are getting that puff when you come off boost. The turbo is most likely sucking oil (seals) and sending it into your intake. It is less noticeable when you are driving normally but under boost the oil intake is more, thus more smoke pufing out. Get your turbo checked.
P.S. I am by no means a mechanic or induction specialist but just sharing based on my own situation and deduction.

[shane02pro5]

I had some similar oil consumption over the past 6 months or so. I check my oil every day because of it especially in my new forged motor. I compression tested about 4 times in that period and was around 195 and then with 1/2 tsp of oil I was around 210.

I have read that we have valve guide issues in several threads. Getting worn and not allowing the valves to seat properly. I would get a huge puff of bluish smoke in higher rpms and was going through maybe 1quart a month but I also live 1mile from work so that's alot for me. I'm sure it doesn't help entirely by letting my car warm up for ten minutes probably letting some oil by the rings and then a 3 minute drive and a cool down. So my car is sitting more than it is ever driven.

The black specs on your bumper I think is just from running so rich because I still get that with my new motor and definately no smoke.

[2.0t03speed]

ill have to dissagree the black specs is from oil i should know

[Maxx Mazda]

I've had all the causes of what you can be experiencing. I've had a bad valve seal, turbo seals, and blown piston ring. A valve seal will leak constantly, and slowly. If there's alot of smoke, it's more than likely a piston ring, hate to say it. It's worthwhile to check your oil return line as well, and make sure it's not coked. Also, pull your intake off and check for turbo shaft play.

[DiscreetSpeed]

Are you puffing when going into boost or reving high now? Or even at idle?
If its only on decceleration id say valve seals.

Check pcv system.
Compression check.
Check for blowby.
Check turbo for shaft play.
Look for oil residue in ic pipes.
Maybe even possible head gasket damage.

The list can go on.

[2.0t03speed]

he just had his turbo re done by MPI nick last year around september-october so i wouldnt think it was the turbo.

[shane02pro5]

So was your oil issue bad turbo seals or blowby? I have always had black specs on my bumper and I'm definately not going through any oil right now?!

[2.0t03speed]

mine was oil. and even when i was running rich i never had black specs on my trunk

[Jaysanooch]

subbing! Did you have the head inspected before putting it on?

[Kooldino]

@ the OP - My gut is telling me rings or valves, but don't quote me on that.

As for most boosted guys with oil issues, this will help out big time:

http://www.mazdas247.com/forum/showthread.php?t=123694492

[magnumP5]

Alright, lots of information - thanks guys.

Just to reiterate my problem: I get a good puff of smoke when I get back on throttle only after decelerating from high RPM (so engine is in hard vacuum for a bit). I can clearly see the puff through my rear-view mirror and it quickly goes away. From what I can see there is no smoke at idle, when under boost or just normal driving (all at least when warmed up).

Well so far I haven't been able to check much - this is a really busy week so I'll have to get to things when I can. Things I do know so far:

1) PCV still rattles around when I shake it so that should still be good
2) I have those Krank Vents installed and they both still rattle so they should still be good
3) I pulled the spark plugs on Monday and all plugs looked good (not oil soaked or anything)

(1) and (2) make me believe this is not a PCV issue but I still need to check all the lines for clogs just to make sure. As for (3) I suppose something could have blown out yesterday so I will also be checking the plugs again soon.

What I haven't done but plan to do shortly:
1) Check all PCV lines
2) Re-inspect spark plugs
3) Check turbo for shaft play
4) Inspect hot pipes for oil spray/residue
5) Compression Test
6) Leakdown Test?

Without this being something stupid like a clogged PCV or whatever I am leaning towards all this being either a bad piston ring(s) or a bad valve seal(s). If it is the turbo I am going to be severely pissed because I got it worked by Nick at MPi just last September and he assured me the turbo was fine.

Anyhow guys, keep up the input - this is what makes this community great!

[blkonblkMSP]

I am having this same problem(sad2)

[blkonblkMSP]

(bump)

[magnumP5]

Just a quick little update:

All PCV lines are clear of any sort of blockage. Also, the hot pipe is dry and there is no oil residue inside at all. I also played with the turbo a little and while there is a slight side-to-side play it does not appear to have any forward/backward play (which is the "bad" type of play) so I think I can probably run out the turbo. Also, after driving the car around town for a bit today I still cannot replicate the puffing issue. I did check the oil and it is about 1/8" below the "F" and I'm fairly certain I had filled it yesterday. Now I just need to recheck the spark plugs and will follow that with a compression test and then a leakdown test if needed.

On another note I am beginning to wonder if I over-filled the oil over the past few days and the excess was causing some blowby. I mean, if I over-filled the oil the oil return line would be backed up somewhat and that could lead to a buildup of pressure. Does this reasoning make sense? I have to drive another 100 miles or so today so I will be sure to look for puffs and I will check the oil level tomorrow to see if I've lost anymore.

[magnumP5]

Another slight update:

Still haven't managed to get around to much because it's been raining all day. I was able to check the oil and it appears to be at or around the same level it was yesterday so that is good I suppose. I drove about 60 miles yesterday, some being highway and didn't really see any smoke. I thought I saw one puff but who knows. I will hopefully be getting my hands on a compression tester sometime this weekend so we will go from there.

[DiscreetSpeed]

I am having this same problem(sad2)
bring that beatch to me (five-0)

[magnumP5]

Still smoking. On throttle I'm blowing out a good amount of black smoke - but that's something completely different. Definitely blu-ish smoke off throttle though. Took it to a local dyno this past weekend and as soon as I let off I got some decent blue smoke - nothing under boost though and certainly nothing while just driving around. A lot of the local car club guys are saying it's my turbo; not so sure about that...

[2.0t03speed]

id wana say its the valve seals if it was the rings i would see it blowing the entire time when you let off your under massive vacume so i could see it being sucked by the valve seals

[magnumP5]

Yeah I'm fairly certain it isn't rings just because of the lack of smoke under load (blue smoke that is). It's definitely either the turbo or the valve seals and I'm leaning towards valve seals because the turbo was just inspected, cleaned and upgraded back in September. Need to do a leakdown test to find out for sure though. When I get the time I'm also going to pull the return line just to make sure nothing is blocking it up. As a side note it put down 214/220 at the dyno on Saturday but I'm pretty sure those aren't accurate because the dyno lost my ignition signal after 5500 RPM!

[blkonblkMSP]

bring that beatch to me (five-0)

I would man but its so hard to get a hold of ya. ill PM ya