Date: Thu, 14 Oct 2004 01:45:01 +0100 From: Charles Christacopoulos <c.k.christacopoulos_removeme_nospamee.ac.uk> Subject: Re: H engine in 9-5?
Dave Hinz wrote: > For reasons I really don't want to go into right now, I'm asking an > uncomfortable question. I think you have lost your head so here is some help to see if you can get it back on its stand (neck). > > What are my engine options for a '99 9-5 which currently has a very > misbehaving 2.3L LPT engine? My burst PCV hose(s) seem to have been > a symptom of, rather than the cause of, my engine's problems. According > to the non-saab-specialist garage who looked at it, it has _VERY_ high > crankcase pressure, which he is thinking is heavy-duty engine problems. > He is also bowing out of the repair process, as he's not comfortable in > getting too deep into something he doesn't know. He is honest. He probably knows the problem but wants an easy(ish) life and no customers coming back to complain. > > OK, here's my real question I guess. WTF would happen while driving that > would include PCV hoses (plural) bursting/dissolving, and when said hoses > are fixed would include knocking of the engine? I don't get it. I'm > rather pissed off right now so if I'm not being real clear please forgive. Missing the meaning of WTF. Crankcase pressure can happen in one way (and with imagination in two more ways). Method 1. Gases escape from the piston rings/cylinders into the cranckcase etc. Worn/broken rings or worn cylinders. Method 2. Gases escape via the valve guides. Method 3. Completely screwed up ignition timing (not really). The first is the most likely. If you have blue smoke and possibly reduced performance you are looking for a broken ring(s). The chances are the problem is at (1). A compression test should reveal what is happening. If you follow the normal steps you should see if some cylinders are faulty or if they are all worn it should show up when you test with some oil dropped in the cylinder. > > Suggestions? Can I stick a "B" engine in there? How about an "H" engine? No comment. > Or, should I just get the 99T running now rather than later and park the > 9-5? > > Argh. I don't have time for this right now. Any suggestions at all? > Could this actually be something trivial in the PCV system that just > makes the engine sound like crap and _sound_ like a knock? If it is a real knock (following from point 1 above) then it is a completely worn out engine (big ends or small ends or both are gone). If however the ignition timing is gone wrong (faulty chain, gears or electronics) then ... sorry my timing knowledge is using stroboscopes nothing with the electronic stuff. I have knows bad timing (valve timing) in my previous C900 to cause fuel and a lot of oil to go back in the air filter only to be sucked back in and cause a lot of dirt everywhere. Something like that could happen with a stuck valve or a faulty hydraulic tapet (thingie on the valve). Not enough though to explain all the things you describe. > > Mightily annoyed/frustrated/stressed, > Dave Hinz > > I would start from a compression test. Sorry I am not saying what it involves as I am not sure of the proceedure to isolate electronic ignition systems ... and catalytic converters. If you have a worn engine it may be worth rebuilding, if something is broken a lot will depend on damage in the cylinders. If it helps at all. Charles -- Please remove _removeme_ to reply. Work: http://www.somis.dundee.ac.uk/ Hobby: http://www.egothor.org/
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