Date: Wed, 11 May 2005 14:45:09 GMT
From: Jef Gearhart <>
Subject: Saab 9-5 Idle Stall problems

Hello all.. I apologize up front for the long post, I'm detail oriented. I recently purchased a 1999 9-5 SE 2.3L T Auto w/ 60K miles. The price ($8250 US) was good enough to justify dealing with some issues. The car runs absolutely fantastic on the open road. That 'sport' transmission mode is too cool. All components and features work. The car had 'check engine' when I bought it, and two trips to the dealer fixed it up. Incorrect plugs, Trionic settings out of whack (1st trip - $225). Light came on again. Needed software updates from Saab due to component communication issues (being that I am a software engineer, it's ironic), (ironic Trionic?), anyway.. They did not charge me anything for the second visit. I now have ~350 miles on it with no warning lights. I must say I am just utterly impressed by the dudes at Ken Batchelor Saab/Hummer in San Antonio, TX. Absolutely superb service. However.. I am experiencing the problem which I have seen many other posts about. The car idles fine at times. It always idles fine in Park or Neutral. When I drop it into gear, it shudders and sometimes dies. Usually it just shudders and then recovers, until the next time I stop/go. When driving, I come to a stop and it shudders and often dies. Hot/Cold does not seem to make a difference in the behavior. Interestingly, when I got the car back from Saab, it did not have these problems until I had about 120 miles on it. It seemed to degrade over time. Now it is fairly consistent. It also seems to jerk around a bit when decelerating. Holding a steady velocity, there is no noticeable roughness, and acceleration is good. But transitions from foot on gas, to off, to on again seem.. not quite right. I should also note that when I drove the car home from Houston (with CE light on), the car shut down (died) at 65 MPH, about 4-5 times. Flipped it into neutral, turned key off/on and cranked right up while still coasting.. running beautifully. This has not recurred since the dealer visits. So, from what I've read, the (home cured) possibilities are: 1. Throttle body needs cleaning.. 2. Crankshaft Position Sensor faulty. 3. Turbo Bypass valve leaking. 4. DI failing. I cleaned the throttle body last night. Visual inspection revealed a very clean looking throat. While it pepped up for a few minutes, no real change in behavior. The DI cassette 'looks' good, no signs of oil around plugs or coils. It may even be a replacement cassette. Sucked on a vacuum hose (as best I could), and there was Zero give. So bypass valve should be ok, right? Any other suggestions before I drop the $60 on the CPS?? Hell, for the first guy who hits the nail on the head, I'll paypal you a... ummm... Liter? Thanks in advance for any help..

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