KStretch55 Posted May 27, 2005 Share Posted May 27, 2005 Hiya, I'm hoping you all can help me diagnos a problem. My '91 Loyale SPFI MT has a miss. I know I've got one cylinder that's got a problem, but I'm hoping I can get some help narrowing it down. It runs good and isn't loosing any coolant. Uses and looses about 1 qt of oil in 300 - 500 miles. Smokes now and then, especially when I back off the throttle and then get back on it. Especially noticeable at low RPM and under load. Blue smoke. I think it's either a lot of oil leaking past the rings in that cylinder or valve guides. Am I missing something? Anyone have some advice or better diagnosis. Thanks in advance, Stretch Quote Link to comment Share on other sites More sharing options...
subynut Posted May 27, 2005 Share Posted May 27, 2005 Have you replaced things like, cap, rotor, plugs and wires? Which cyl is it? Quote Link to comment Share on other sites More sharing options...
SuBrat84 Posted May 27, 2005 Share Posted May 27, 2005 PCV Valve? I had minor blue smoke that went away when I replace the PCV. Quote Link to comment Share on other sites More sharing options...
KStretch55 Posted May 27, 2005 Author Share Posted May 27, 2005 I just started driving this car after it had sat for about 18 months. It had this problem before I quit driving it and I had changed some of the suggested components, but unfortunately, I don't recall which. I know I replaced the plugs and I think the wires (they aren't OEM). I tried soaking the PCV valve in gas for a while to see if that made a difference. Didn't seem to. I think I'll try a new cap, rotor and PCV valve and see what happens. Oh, if I recall correctly it's the #3 cylinder. Quote Link to comment Share on other sites More sharing options...
royboy159 Posted May 27, 2005 Share Posted May 27, 2005 Hey KStretch----One oil fouled plug might indicate time for a compression check if plugs and wires check out O.K.. All oil fouled plugs---bad news! Quote Link to comment Share on other sites More sharing options...
KStretch55 Posted May 27, 2005 Author Share Posted May 27, 2005 Thanks, yep it's just one that seems to foul. Guess I'd better do a compression check. I think I'll look for some JY heads and plan a swap sometime soon. Quote Link to comment Share on other sites More sharing options...
royboy159 Posted May 27, 2005 Share Posted May 27, 2005 Hey KStretch---Don't forget to do a second compression check with oil to rule out a ring problem. Quote Link to comment Share on other sites More sharing options...
Skip Posted May 27, 2005 Share Posted May 27, 2005 Boxer engines do not respond to a "wet comp. test" oil lays basically on the bottom of the cyl inline and "V" engines - yes horizontally opposed - no This sounds like valve seals but a new OEM - not after market - PVC valve should be tried first Quote Link to comment Share on other sites More sharing options...
idosubaru Posted May 27, 2005 Share Posted May 27, 2005 if you're loosing that much oil, make sure the block is good before spending time and $ on heads that might not fix your problem. Quote Link to comment Share on other sites More sharing options...
royboy159 Posted May 28, 2005 Share Posted May 28, 2005 Hey Skip---Good to hear from you. The very difficult trick in wet compression testing a boxer engine is to direct a small amount of heavy oil right to the upper surface of the cylinder wall. A few strokes of the piston and gravity will spread it enough to create a seal on ailing rings. Quote Link to comment Share on other sites More sharing options...
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