19 replies to this topic

[allpaw4]

Ok peoples - a few quick questions, someone might have had this before and be able to tell me straight off the bat whats going on...

1. Went for a holiday over christmas to see the inlaws, and left my baby parked up at home for approx 10 days. When I got back, the following morning I started her up to go out and on first firing, I had a small cloud of blue smoke out the exhaust. Any ideas?

I'm suspecting a very small leak on one of the turbo bearings as the culprit, but this is the first time she has done it, and it was parked for a lot longer than she would normally be, so I really have no idea...

2. Also, when its a cold morning (in the vicinity of 0 deg), she also has a hard time starting. Takes about 10 seconds of cranking before she will fire, and runs awfully rough (talking 3 - 400rpm rough) for another 10 to 15 seconds before the cold start revs pick up. Only when cold, both engine temp and ambient. When ambient temp is higher, there are no issues.

I know these questions are going to be pretty damn hard to answer, but please, if nothing else, give me a few ideas to chase down.

Cheers,
Ben

[Evil_VZ-T]

Leaky injectors with a hint of valve stem oil seal weepage??

[BigWillieStyles]

Do you park the car outside? Condensation can give a false impression of blue/white smoke. If it was a serious problem, wouldn't it persist when the car is fully warmed up?

[allpaw4]

Thanks fellas. Will start down the road of chasing them up. If its the injectors, it might get some new ones. As for valve stem seals, I think it will just get left alone until I can afford to have the heads done properly (cleaning, porting etc, no point having them off and not making the most of it). If it gets worse, I'll be forced to do it sooner, but otherwise it can wait.

Not real convinced that its condensation, only because the blue smoke thing has only happened once (and condensation happens every cold morning), and the white cloud of condensation doesnt go away after a second or 2. I should mention that when I started her up, she fired first crank, and ambient temp was about 30 deg.

[suggo]

blow by! it actually had time to settle then gets blown out on start up.

[Snootaloop]

Hey guys thought I'd ask I'm startin to get a thick blue cloud every now and then apon start up even if drove and is still warm what does this mean?

[Zac]

Sounds like oil mate... blue smoke... is it only on start up, and goes away after a few seconds, or does it happen while driving too?

[Snootaloop]

Just start up

[Zac]

Just start up

Should be ok if it is at just start up... try letting your car idle(cool down) a little after a fast drive of boosting... maybe wait 30second? Then turn the car off... See if that helps.

 

I know my car smokes on start up if I start it up even hours after boosting like crazy and not letting it cool down before turning it off...

[Snootaloop]

Got turbo timer set at 20 I'll raise it up a touch then see how it goes

[Zac]

Yup, and let us know... I read that if you see a puff of smoke when you hit boost when driving, then it could seals on your turbo...

[jaydece]

Things that quickly come to mind...

 

what oil viscosity are you running?

 

what oil brand? oil not overfilled? there is 2 oil full marks on the oil stick(well on mine there is)....oil cold and oil hot....

 

how often are you changing oil?

 

have you tried UEC(engine upper cleaner) to get some of the crap out?

 

cold start issues? what fuel are you running? is the car tuned? if so maybe injector latency, scaling needed? cold start tables need tweaking? enrichment tweaks....etc etc..

[Snootaloop]

Penrite 15 _40w changed it few weeks ago try to change it at halfway befor service. No haven't done UEC what does that consist of?
Run bp 98 and Na in process of Savin for tune.
Concern is it doin any damage? Or is it a major issue?

[Liberty]

Here's some general information about upper engine cleaner.

 

http://www.subaru.co...bon-maintenance

[Snootaloop]

Cheers gaz helpful

[Liberty]

You're welcome man.

[Jimbo]

Is anyone experiencing this problem after they have parked on an incline?

When i had my Legacy, if i parked facing up or down a hill, i would get smoke on start-up. It's from oil getting in the combustion chamber and burning up. Never happened when parked on a flat surface.

Also, allpaw, you may have a dicky coolant temp sensor. Had the same problem with my Gen1 conversion, bitch to start in the cold but higher temps wasn't a problem, swapped out the coolant temp sensor with a better one, solved it.

[Snootaloop]

Na mostly parked on flat and never had trouble with cold ill turn the timer up and get onto the UEC and drop oil again project see how that outcome goes until can afford tune.

[Snootaloop]

Worse thing is if I sell this Rex il prob go back to a ute not ready to get rid of this toy yet