Smoking Engine

[Jimmy_GTR]

Hi guys

My dads 33 Gtr has been sitting around for 12 months or more as he has been overseas, the engine is now smoking mainly on deceleration. The car doesn't really smoke when crusing, we think that the oil rings may be stuck in the piston, does this sound right? or could it be something else such as valve guide seals or the wrong oil. If it is the oil seals that are stuck is there an addative that can be used to release them?

Any ideas on what could be wrong would be much appreciated.

[arbess]

smoke? im presuming its black, because white is harder to see.

poor oil quality? bad vacuum (But that would root your idling) ? spark plugs? fuel filter?

check the regulars =)

[Godzilla32]

What color is the smoke? Black, blue, white? If you have only just started to drive it again and this hasnt been going on for awhile i would possibly give it a motor flush and oil change with something like motul oil that has high detergent content. It does sound to me like oil rings so i'd be giving it a good thorough clean internally...

Hope she comes good. Was is started periodically during the 12 months?

[Trex101]

Hi guys

My dads 33 Gtr has been sitting around for 12 months or more as he has been overseas, the engine is now smoking mainly on deceleration. The car doesn't really smoke when crusing, we think that the oil rings may be stuck in the piston, does this sound right? or could it be something else such as valve guide seals or the wrong oil. If it is the oil seals that are stuck is there an addative that can be used to release them?

Any ideas on what could be wrong would be much appreciated.

Change your PCV if you find alot of oil in your throttle body.

[MerlinTheHapyPig]

Just give it some time and see if it comes good. If it's still happening after a week of normal driving, you should look further into it. Also, if it's blue smoke, then it's burning oil, if it's black smoke then it's running rich (maybe a cooler pipe leak, or afm problem etc.). You can do a compression test to rule out any serious engine problems (ie. rings)

If you have to leave a car without driving it, you should start and run it for 10 minutes once every couple of weeks for future reference.

[Duncan]

from memory worn valve stem seals cause smoke on deceleration....if it doesn't go away on its own.

[Risking]

Worn/brittle valve stem seals will cause the problem you have described.

Changing the oil can rectify the issue however an old trick to softern up the seals is to put a cap of brake fluid in with the oil.

Brake fluid softerns rubber and can rectify the problem. If they are too bad then nothing short of replacing them will help you, however try the cheap option first and see how you go.

People will probably jump up and down about putting brake fluid into oil but if anyone actually knows an old school mechanic ask em about it and see what they say. Works wonders for mild seal problems.

Brad

[tridentt150v]

The stop leak products work [and they look suspiciously like brake fluid]. Around $10 at somewhere like supercheap.

[Godzilla32]

Ive also heard this trick of adding brake fluid, ATF softens rubber also... I think id still feel strange putting it in with my oil tho..