NH-75-Z Posted June 23, 2003 Share #1 Posted June 23, 2003 I have a 75-280 w/91K on it. Got it 2 months ago from So.California. Have spent time getting it tuned,timed,etc and itruns real good. But has developed oil smoking real bad on a long decelarationmode like coasting down a hill. Have done compression check twice, range from 150 to 125or 130 in #'s 4 and 6. Vacuum is 16"/HG . I adjusted the valves(1st time), no noticiable change.It does not smoke on start up. So what do you all think?? Valve stem seals or lower endIE: rings:cry: Link to comment Share on other sites More sharing options...
240ZX Posted June 23, 2003 Share #2 Posted June 23, 2003 It sounds as though you are sucking oil past your valve guide seals. At 91,000 miles the seals are likely a bit worn. Well, at least it keeps the top end lubed. Seriously, it won't hurt anything but the environment. So quit decelerating.....keep it WFO!!! Keep enjoying your toy......until you must overhaul. Link to comment Share on other sites More sharing options...
Gav240z Posted June 23, 2003 Share #3 Posted June 23, 2003 I'm sure my car is burning oil through the valve stem seals and I would like to replace them because replacing the oil at regular intervals might be good for the car but I'd rather have as much oil in their as possible.Just my 2 cents. Link to comment Share on other sites More sharing options...
beandip Posted June 25, 2003 Share #4 Posted June 25, 2003 valve stem seals usually show smoke at start up. When you do a compression check squirt some oil in the cylinder first and see if it improves the reading . If it changes nothing look to valve seals if it improves, look to rings. Link to comment Share on other sites More sharing options...
beandip Posted June 25, 2003 Share #5 Posted June 25, 2003 Just a thought , is this a manual or a automatic trans. ? Whey you decellerate you are drawing max vacume , check the vacume line from the automatic tranny if you have one. If there is oil in the line the vacume shift diafram is shot and you are burning tranny fluid. Just another possability. Link to comment Share on other sites More sharing options...
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