coming out of tailpipe aftr driving for a while[10-15 min]if i stop and restart after cooling-exhaust is clean until driven again for a couple of minutes.I have an o2 sensor not giving any codes,i dont know about valves or rings could they be the cause?? 350 tbi 90. any help appreciated! Thanks!
CK5
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pretty blue smoke?
- Thread starter only 31s
- Start date
resurrected_jimmy
1/2 ton status
Since it doesn't do it on start up, I would guess the valve seals are good. Do a compression test to see if you are getting blow-by on the rings
is it on accel or on decel that you are getting the smoke? or is it after it idles for a while and then smokes when you pull off?
my k5 used to load up with smoke when it was idling. pulled the valve covers and found that the oil drains in the head were plugged (thanks previous owners) and the oil would collect in the valve covers and then leak down through the valve stem seals. cleaned the holes, changed the oil a couple of times with a 1/2 qt of atf. no more smoke. not even at startup.
just a thought.
ryan
my k5 used to load up with smoke when it was idling. pulled the valve covers and found that the oil drains in the head were plugged (thanks previous owners) and the oil would collect in the valve covers and then leak down through the valve stem seals. cleaned the holes, changed the oil a couple of times with a 1/2 qt of atf. no more smoke. not even at startup.
just a thought.
ryan
