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Old 06-30-2015, 05:08 AM   #1
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99 9-5 Estate ... RPM and Fuel Pump Question

Good day all ...

I'm a relatively new (6 months) owner of a 1999 9-5 Estate (2.3T). Love it. I have never owned a car with a turbo nor any vehicle that exudes this kind of quality ($ 31K sticker). I bought for $ 1K with about 185K miles. New tires and good overall maintenance. The only codes I've experienced were something to do with the turbo performance and the Front O2 sensor. I've done the basics .. new O2 Sensor (no code since), new bypass valve (no turbo code since), new SID ribbon cable, new plugs, new fuel filter, new air filter. Clean MAF sensors w/ CRC.

I am experiencing good overall idle ... at an average of 825 RPM. The car does something on occasion (not every day) ... the idle will drop to maybe 550-600 and it feels almost like a 'vapor lock' situation and the car almost stalls. So I'm constantly watching the tach while driving. I want to replace the fuel pump in case that's the prob (and for preventitive maintenance anyway) and maybe the Fuel Pressure Regulator too. I have been watching lots of youtube vids about the pump replacement as well as reading these forums for tips. I can get a Bosch pump (69424) for $ 55.00 via Amazon. Any thought on Bosch vs Delphi vs Walbro vs any others for long trouble-free life? Any thoughts about my occasional drop in RPMs? Do SAABs ever suffer from vapor lock. It has happened on cooler, wet days as well as really hot days. I know I need to pickup a Fuel Pressure Guage somewhere. Many thanks all!
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Old 06-30-2015, 06:51 AM   #2
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I don't think I have ever seen a Saab vapor lock. Could the drop in RPMs have anything to do with the A/C being used? Which plugs did you install? I would suggest you replace all the vacuum lines as a precaution too.
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Old 06-30-2015, 08:07 AM   #3
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Thank you .... I wouldn't think vapor lock would be an explanation either ... but that was the problem du'jour when working an all the old Datsuns I used to own. I just replaced with standard NGK (BCPR6ES-11) plugs ... BCPR7ES-11 came out but I experienced this same problem well before the plugs were exchanged. Agreed ... I should probably replace all the vacumm hoses on a car with this many miles.

Excellent thought on the AC ... next time I experience a drop in RPMs, I'll turn off the climate control to see if she normalizes; many thanks.
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Old 06-30-2015, 08:26 AM   #4
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Yeah, either OFF or ECON will kill the compressor. Could be perhaps the electronic throttle body beginning to fail.
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Old 07-15-2015, 11:01 AM   #5
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Thanks Saabeh .... Update: I just installed a new crankshaft position sensor and right away the idle seems more consistent and controlled. Now I don't feel that scary 'about-to-stall' feeling at intersections so I think that was a large part of my problem. I'll still replace the fuel pump and fuel pressure regulator as preventative maintenance on this car since she's well advanced in miles.
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