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| Lost of blue smoke for a few seconds but only when started hot. (Page 1/2) |
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cebix
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NOV 04, 06:56 AM
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'85 duke auto.
This started recently. When starting up cold all is good and when driving all is fine. But when I say go get gas or park for a minute or two when already warm - when I start the engine there's just so much blue smoke it's embarassing. It'll go for ~10 seconds like this and settle down after that.
What could be the cause? Does the engine need a rebuild? Or maybe something like valve stem seals are finally shot? Any ideas will be helpful but overall I think of rebuilding the engine after the winter.[This message has been edited by cebix (edited 11-04-2018).]
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Gall757
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NOV 04, 08:55 AM
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It's common on the V6. I used an oil additive and the smoke went away after a few months. I think the valve seals get hard or dry out. hot oil will sneak by more than cold oil. If you changed oil recently, perhaps your new oil is thinner than before.
 [This message has been edited by Gall757 (edited 11-04-2018).]
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fgt1988
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NOV 04, 10:27 AM
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Depends but what s your mileage on the V6 - The seals do start going bad early on these V6 as said; an easy weekend project to replace versa rebuilding the entire engine if your engine is still strong -- I' ve seen 200K on these engines run strong with that seal problem but still kicking ass -- All depends on what your budget and time you plan to sacrifice .... Good Luck ---
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Patrick
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NOV 04, 11:48 AM
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Why are you guys talking about the V6? 
| quote | Originally posted by cebix:
'85 duke auto
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Cebix, are you also getting oil collecting in the bottom of the air filter can?[This message has been edited by Patrick (edited 11-04-2018).]
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Gall757
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NOV 04, 11:54 AM
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| quote | Originally posted by Patrick:
Why are you guys talking about the V6?
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It's my only experience, but I figure the seals in the Duke are made out of the same stuff...[This message has been edited by Gall757 (edited 11-04-2018).]
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cebix
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NOV 05, 01:13 AM
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Yes, I also have a puddle of oil in the air filter.
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Patrick
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NOV 05, 01:48 AM
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| quote | Originally posted by cebix:
...when I say go get gas or park for a minute or two when already warm - when I start the engine there's just so much blue smoke it's embarassing. It'll go for ~10 seconds like this and settle down after that.
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| quote | Originally posted by cebix:
Yes, I also have a puddle of oil in the air filter.
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First of all, make absolutely sure your PCV system is working properly. A plugged/sticking PCV valve could lead to crankcase pressures building, forcing oil into places it's not supposed to go.
Secondly, here's something I've done with my '84 2.5 (and then later to my '88 2.8 as well). Quoted from a post of mine at a non-Fiero forum...
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I have a 4-banger Fiero that had a heck of a problem with oil/blow-by entering the air filter canister. Oil would actually pool at the bottom of the canister.  It was quite a nuisance. I had the valve cover off while doing something to the engine, and I noticed that the valve cover was baffled where the PCV breather tube plugged into it. However, this hollow chamber was obviously failing in regards to separating oil vapor from the rest of the crankcase gases. So I used a strip of metal hexmesh and folded it back and forth about half a dozen times, and positioned it securely inside this baffled area. The crankcase gases now all had to go through this multi-layered mesh before traveling up the tube and entering the air filter canister. Honestly, the results were simply unbelievable! I now find no oil in the air filter canister when previously it was pooling and needed to be drained. 
The hexmesh I used was similar to what is shown in this following online image. The holes are about 1/4" in diameter.
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cebix
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NOV 05, 04:10 AM
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The PCV was replaced about 2 years ago and it looked ok when installing. Might check it though again, thanks for the tip.
Assuming the PCV is ok could something else be the problem? Maybe there's blowby caused by worn piston rings?
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Gall757
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NOV 05, 08:55 AM
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A compression check would tell you that.
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theogre
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NOV 05, 11:44 AM
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Some times you get the opposite more smoke for cold start and less for hot start but is same problem...
This is most likely bad valve seals and/or guides problems. Maybe valves themselves are worn too.
Hot start can be more obvious but likely have some oil smoke when started cold too.
Cold start can allow time so oil from valves to leak thru the piston rings to the pan so less or no smoke to start the car.
You can replace valve seals in the car but often only a temporary fix. You likely need a valve job @ minimum.
heavy oil in breather in air cleaner is often Not PCV. Is heavy blow by from iffy rings and/or valves. (Valve blow by is exhaust valves w/ bad guides etc.)
PCV simply can't suck out heavy blow by from either and pressurize the crank case and valve cover(s) then pressure and oil goes thru any exit handy.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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