Date: Wed, 29 Oct 2003 17:13:30 GMT
From: "David Spear" <dspearREMOVE99canopsamo.com>
Subject: Re: Need some help badly


Went offline with Grunff about this one... I spoke to my longtime Saab mechanic in the city where I used to live (I live about 400km outside a major city with a Saab dealership or specialized shop) the other day. Turns out he has seen the problem before and that it can be corrected by replacing the washers between the fuel line fitting and the fuel distributor. I did this and so far (only one day later) have no bubbles. So, I am back where I started. No bubbles, but car still quits periodically. I had a fitting made so that I can measure the fuel flow rate where the return line comes out of the fuel distributor, that is my next chore along with fuel pressure testing. I think I'll have a shop do the pressure test as I really don't want to spend the $$ for the guage, fittings, etc which I will probably never need again. Even with the new seals my original problem persists... I cannot adjust my sensor plate to bring the O2 reading into spec, it hovers around 20-30 degrees dwell. I am very confident now that I do not have any air leaks. When I disconnect the O2 sensor my reading goes up to 58 degrees... right where it should. Voltage output from sensor is in the range. Anybody ever seen problems with the lambda control unit underneath the back seat? Due to the intermittent nature of my performance problems I do not think it's a vacuum leak or bad sensor or something like that, makes me lean towards an electronic problem of some sort. Most of the descriptions of failed emission relay components do not seem appropriate for what I am seeing... the car starts, runs poorly for a minute or two, then stalls when accelerator is pressed... As a note, when I first started up the car yesterday with the new seals on the fuel distributor fittings, my dwell reading was 60-70 degrees for about 20 seconds or so... I am guessing this corresponds to the cold-start injector enriching my intake mixture. I have not checked my injector spray pattern so thinking about it maybe one or more is clogged... I am scared to do the disconnect and remove them as I do not want to damage the plastic fuel lines as per the test outlined in my (bentley) manual. "Malcolm" <mwm1XXXnopsamedu> wrote in message news:7tmupvsgkt75ivfps6ocl93e6afp9acv3enopsamcom... > > >> > : What could cause air to be introduced > >into my #2 fuel line. > >> > >> Either the fuel distributor is faulty, or it's not getting > >> adequate fuel pressure/flow rate. They're pretty reliable > >> beasts, so check the line pressure and flow rate first. > >> > >> > >> > No bubbles in any other lines, and the bubbles are > >> > definitely coming out of the fuel distributor. Could a failed or > >failing fuel distributor account for my inability to bring my fuel mixture into > >> > range? > >> > >> Yes. > >> > >> > >> > Could it account for the car stalling and refusing to start? > >> > >> Yes. > >> > >> > >> > What > >> > can go wrong with the fuel distributor and is it internally repairable? > >> > > It is being asumed that the bubbles are air. > > Is it possible that the are vapourized petrol? > > Something like "cavitation. . Could that line beunder a slight > negative pressure? > > Malcolm >

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