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Lots of smoke.
Posted: Fri Feb 02, 2007 10:36 am
by ZOOK92
Morning all,
I have a '92 Sierra that use to smoke a little at start up and when flooring it, but yesterday it started to feel it was running on 3 cylinders. I cleaned the plugs ( and they were stuffed, no inslation at all around the electrode) and it drove home fine. This morning it started running rough again, same place, which is a very steep down hill, but it was also blowing a LOT of smoke. On the level again, it ran rough for a bit, but then ran fine. it does use quite a bit of oil, so do i presume it may be something quite bad, maybe the valve stems oiling the plugs up?
OILY?
Posted: Fri Feb 02, 2007 11:20 am
by want33s
I would agree with your diagnosis. Valve stem seals. If you park on a steep incline the oil in the rocker cover pools at one end above the valve stem seal. Your seals are old and hard and are letting oil down the valve stem into cylinder, causing it to misfire. Valve stem seals are cheap and if your valves seal ok you can replace stem seals without removing the head. OR don't park on hills.
Posted: Fri Feb 02, 2007 11:25 am
by ZOOK92
Thanks for that. I had a bad feeling it may have been something a little more terminal!
Posted: Fri Feb 02, 2007 7:34 pm
by v840
Sounds like stem seals but I would get a compression check done aswell. No point replacing the vs seals if your rings are cactus.
Valve stem seals
Posted: Sat Feb 03, 2007 7:49 am
by Impulsive
All is not lost though. You can fill the combustion chamber with compressed air (using a spark plug hole adapter) and hold your valves up that way to replace them. That way you don't have to remove your head... unless you want to do so to freshen up the head gasket.
Regards,
Adam
Posted: Sat Feb 03, 2007 8:38 am
by moose
does it make any noise ??
i.e knocking under load ??
might of cracked a piston !!!
Posted: Mon Feb 05, 2007 7:24 am
by ZOOK92
Moose,
the engine is still quiet, and does not make any horrid noises, bar a lilltle rattle that disappears when it has warmed up.
Posted: Mon Feb 05, 2007 6:48 pm
by ronoor
make sure its bang on the dip stick a little over the top mark they will blow smoke . cheers ron
Posted: Tue Feb 06, 2007 7:05 am
by ZOOK92
Ronoor,
it is actually using oil, but i do make sure it is a little under MAX. It has been getting worse over the last two weks or so, but it will be fixed this weekend. Gee's you should see it going down hill, because the people behind me can't!