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  #1  
Old 22nd November 2010
ljschalm ljschalm is offline
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Angry 2000 9-5 Cranks but won't start

I have a 2000 9-5 w/the 2.3 L turbo…automatic…142K miles.

About a month ago, it died by the side of the road. I have an OBD II reader…no codes were present. My Brother (who lives out of state, other side of the country) is an ex-Saab master mech (and he is on vacation hunting in Northern Canada…no phone or email). After much research, we agreed the computer was the likely culprit.

Today, installed the new computer then took it to a local Saab mechanic who reprogrammed the system with the TECH II (after swapping computers I had a Immobilizer Code). Had both keys reprogrammed to be safe.

The car started immediately, no codes. Since I towed it to the Saab dealer with a dolly, I had to drive back 60 miles. Got home, car started without issue. Drove off the dolly and ran for 10 minutes…then it suddenly shut off. Cranked once, no fire, cranked a second time it started up. Ran for 45 seconds…then shut off and has not started since (6 hours ago).

A few key data points…

· Fuel pump replaced 4 months ago
· CPS replaced 3 months ago
· Ignition Coil swapped with known good one

All items were done because the car would shut off…not start for a few hours…then start. This problem occurred every few weeks…until a month ago when it became a hard failure…thus the Computer was replaced.

Prior to computer swap, engine would not fire…even if ether was sprayed into fuel system (at vacuum hose inlet near throttle body). After swap and after today’s failure, I sprayed ether into the vacuum hose inlet and the car tries to fire…which lead me down the fuel road…only corrective action was to install a new fuel filter today. Last item, after multiple checks for codes, I did flag 1 P0337 code.

Before I start replacing parts already replaced, I thought I would post this. This one is kicking our behinds…
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  #2  
Old 23rd November 2010
Jssaab Jssaab is offline
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Sure sounds like CPS did you get the old o ring out when you relaced the CPS?
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  #3  
Old 23rd November 2010
Saab95Aero01 Saab95Aero01 is offline
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My car would turn but wouldnt start, changed the crankcase positioning sensor and now everything is perfect, to check the sensor strip the wiresrunning from the sensor you will see a black and white wire, use a a tester set on 20k and you should get a reading between 770 and 960.
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Old 23rd November 2010
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I agree with Jssaab and would want to know if you got the old O ring out before installing the new CPS. I would also ask if you bought the good Bosch version of the CPS and wheather the fuel pump motor comes a reputable source. Have you checked the wiring leading to the fuel pump?
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  #5  
Old 23rd November 2010
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Chris 9-5 Chris 9-5 is offline
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Quote:
Originally Posted by ljschalm View Post
Last item, after multiple checks for codes, I did flag 1 P0337 code.
Which is the code for CPS being out of range....
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  #6  
Old 23rd November 2010
ljschalm ljschalm is offline
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I checked for continuity on the 3 wires leading to the CPS (Red, Blue, Black). I read wide open (infinite resistance) regardless of which position.

What strikes me as odd is that the part is 3 months old...however, it was not a Bosch...came from Rock Auto.

I have a Bosch coming tomorrow.

BTW, is there a good post for checking fuel pressure? The fuel pump runs for a couple seconds, then does not run again (based strictly on lack of sound or vibration of the pump...

Again, maybe another thing pointing to the CPS...

thanks for the help...

Les
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Old 23rd November 2010
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photousa photousa is offline
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Did you buy the entire fuel pump assembly or just the fuel pump motor?
Others here would be better qualified to answer the question as to if the fuel pump should be running all of the time when the key is one or if the fuel pump runs intermittently...I would think the fuel pump would be continuously running if the key is on, but not sure.
I bought my fuel pump motor here: http://www.fuel-pumps.net/ The fuel pump has worked flawlessly for me. They post a warning here: http://www.fuel-pumps.net/walbro-forgeries.html about buying cheap priced fuel pump motors. There are quite a few really good tutorials on Saab Central covering how to replace your fuel pump motor without replacing the entire assembly.
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  #8  
Old 23rd November 2010
ljschalm ljschalm is offline
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Purchased the entire assy through my brother...source I do not know...
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Old 23rd November 2010
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was it new or used?
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  #10  
Old 23rd November 2010
gbest gbest is offline
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The fuel pump runs for a few seconds when the ignition switch is turned to the on position, then waits for a signal from the CPS telling it to turn on again.
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  #11  
Old 23rd November 2010
ljschalm ljschalm is offline
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The pump itself was new...with rebuilt pump assy
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  #12  
Old 23rd November 2010
ljschalm ljschalm is offline
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My Son arrived w/ his 2005 Saab 95 wagon. It has the same engine and the PN for the CPS is the same. We checked resistance on his CPS and get infinite resistance regardless of which wire combination.

Does the CPS have to be in the circuit to measure resistance? Does the motor need to be cranking

Please advise...

Thanks, Les
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  #13  
Old 23rd November 2010
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Quote:
Originally Posted by ljschalm View Post
My Son arrived w/ his 2005 Saab 95 wagon. It has the same engine and the PN for the CPS is the same. We checked resistance on his CPS and get infinite resistance regardless of which wire combination.

Does the CPS have to be in the circuit to measure resistance? Does the motor need to be cranking

Please advise...

Thanks, Les
No the motor does not need to be cranking. The resistance between pin 1 and 2 should be in the 800 ohm range give or take 100.
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  #14  
Old 23rd November 2010
ljschalm ljschalm is offline
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Update,

Switched my fluke to K Ohms. the 2005 Saab reads 1.06 while installed int the vehicle...but unplugged from the harness. The original in the 2000 Saab still reads infinite open.

New CPS will be here at 8 am.
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  #15  
Old 24th November 2010
ljschalm ljschalm is offline
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Folks,

I want to thank everyone for the help...it was the CPS.

Some key comments...the resistance measurement was critical...as was the fuel pump running for 2 seconds and shutting off. BTW, switching to K ohms was obviously important...

The new one read 810K...and it runs as it should!

Thanks again!
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  #16  
Old 24th November 2010
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photousa photousa is offline
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Quote:
Originally Posted by ljschalm View Post
Folks,

I want to thank everyone for the help...it was the CPS.

Some key comments...the resistance measurement was critical...as was the fuel pump running for 2 seconds and shutting off. BTW, switching to K ohms was obviously important...

The new one read 810K...and it runs as it should!

Thanks again!
Good deal, glad things worked out. So which brand of CPS did you buy 3 months ago and where did you get it?
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  #17  
Old 24th November 2010
ljschalm ljschalm is offline
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Bought it through Rock Auto...stamped w/ Meyle (Germany)
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