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Diagnostic Question......... 850 1995

posted by  someone claiming to be Alex on  Sun Mar 25 15:44 CST 2001 [RELATED]

I have a general diagnostic question. Actually, I have two. The first is, if I don't have any lights on on my dashboard, does that mean that there are NO fault codes registering? The second questions is, would a vaccuum problem register either as a fault code or as a light on my dash? Someone posted a question about oil seepage being related to crankcase pressure or something like that and I think I might have the same question. I have the Haynes manual and it doesn't really say anything about crankcase pressure or the possible vaccuum problems. Could I have a clogged line? ruptured hoses? How would I go about checking and where are these lines? My cruise control is also not working, someone told me that might also be related to vaccuum. This car is such a headache!!!!!

Alex







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    Re: Diagnostic Question......... 850 1995

    posted by  someone claiming to be Tracy on  Tue Mar 27 07:59 CST 2001 [RELATED]

    I had a previousl experience with an oil leak and through some research here is what I found. My Volvo (95 850 Wagon) had a blockage in the breather system. The breather system functions similar to a PCV valve in my MG midget in that it vents excess crankcase pressure. However, the blockage eventually caused the rear-seal to rupture (due to the pressure finding the path of least resistance out of the engine) and this caused a significant oil leak.

    There was no indicator light, nor diagnositc code which pointed to the problem, only an oil leak. Now, the pressure could have blown out any of the other seals, however as luck would have it, this was the most expensive one to rupture. So, it cost a bit of money to get it fixed, but now it's as good as new.

    Point being that the oil leak on my Volvo was a result of crankcase pressure. This is apparently not uncommon.

    Important note though; when the shop replaced the rear seal I ensured that they also took care of theperceived culprit...the blocked breather system.







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      Re: Diagnostic Question......... 850 1995

      posted by  someone claiming to be Alex on  Tue Mar 27 08:35 CST 2001 [RELATED]

      Thanks for the info. Do you know where your repair shop found the blockage? To anyone else out there, are there common blockage areas? I'd hate to have to go through the entire system. It'd be nice to know where to start.

      It's nice to know of another MG owner. I have an MGB before they went all creepy with the rubber bumpers. Have you ever rebuilt your carbs? I have to do that and I'm afraid I won't be able to get everything back together.

      Thanks

      Alex






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