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SLOW 9-5 Resolved?!? (Long) Posted by Tulsaab [Email]  (#31) [Profile/Gallery]
(more from Tulsaab) on Wed, 31 Jul 2013 21:12:57
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2007 Saab 9-5 Aero - 80k mi.
For the past year, i've had a strange issue with my 9-5. Whenever the car got really warm, my fuel economy and performance started to suffer. If you search my name, you'll find the whole chronicles, but i'll give a brief summary.
July 2012 - took 9-5 in to local Cadillac (ex-Saab) dealer for new DI Cassette (covered under GMPP) and they found the infamous passenger side timing cover / head oil leak. Fixed it and flushed coolant.
August 2012 - took family on long road trip to NM through West Texas. Got an avg. of 20 mpg. Upon return, took back to dealer, they looked at me like I was crazy and "looked" at the car again. Couldn't find anything wrong after adding 0 miles to the odometer.
September 2012 - found a Saab master mechanic at our local designated Saab repair station, and he tried to find the problem. While very competent, he checked timing and ran all sorts of tests - spent 8 hours trying to figure it out, but drew a blank.
So, I started replacing things: Air Mass Meter, Spark Plugs, Coolant Temp Sensor, Intake Air Temp Sensor, Manifold Air Pressure Sensor, different DI Cassette. None fixed the problem. Last check, Hiway MPG: 24 to 25MPG, City MPG: 14MPG
After reading a few posts from the last week or so re: the Crankshaft Position Sensor and improving performance, I decided to give it a shot and see if it would get the job done. After all, it sits on the block so could be affected by temperature, and in my non Electrical-engineering mind, i'm thinking that as a sensor ages and gets hot and cold, it could affect its accuracy and therefore throw off the timing a bit.
So, I got the old sensor off the block, installed the new one, and tried to remove the wiring from the old CPS. It wouldn't budge, and below is what I found. Looks like when the Cadillac place removed the head to fix the oil leak, somehow the CPS wire got crimped with the coolant hard line. If I can't move it at all with the engine cold, I can only imagine the stresses on it with the engine hot.
After replacing the CPS, I took the car for a test drive after letting it run in my garage for 15 min. So far, it feels like the problem is fixed. The real test comes tomorrow, and i'll post my findings...
, Wed, 31 Jul 2013 21:12:57 <-- Viewing This Message, Fri, 2 Aug 2013 17:46:14
, Sat, 3 Aug 2013 06:18:41, Thu, 1 Aug 2013 16:28:27, Thu, 1 Aug 2013 07:38:18
, Thu, 1 Aug 2013 06:52:35, Thu, 1 Aug 2013 07:27:49, Thu, 1 Aug 2013 07:34:27, Thu, 1 Aug 2013 07:37:50
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