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Failed inspection -- blue smoke -- is it the turbo? 850 1997

This is a 97 T-5 that I've had for a couple of years. I'd never noticed any emission problem before. Thinking it was because the cat had cooled while waiting in line at the inspection station, I returned another day and left the engine idling, about 20 min. By the time I got to the inspection, there was plenty of blue smoke, and I left a trail of smoke leaving the station. Once that got blown out, there was no obvious problem. I've never had much boost with this car, it's not nearly as peppy as our 96 standard turbo, so I'm suspecting the turbo is worn out and passing the oil.

I'm contemplating rebuilding the turbo, but is there a way to know if that really is the source of the problem? Any way to diagnose the issue? I haven't checked the compression lately, but it was okay when I got the car. I'm not yet sure how much of an effort it would be to get the turbo out and have it rebuilt, but I don't want to invest the effort without some assurance that that's really the source of the problem. Thanks in advance for any suggestions!

--
'96 850T and '83 244 DL both at about 200K, '97 850T5; gone but not forgotten '81 245 and '64 Amazon






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