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NG900 & OG9-3 Workshop NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible Technical Forum

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  #1  
Old 9th May 2010
ilijanik ilijanik is offline
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Default saab 93 1999 won't start!

Hi,

I changed the gas pump and filter on my 1999 saab 93 few months ago. Now the car won't start again, it would only start if I put gas directrly into the intake. I changed new filter for the gas again, but it would still not work. What could possibly wrong with my car? And, how could I find out?

Thank you eveyone, and thanks for helping me few months ago how to replace my gas pump and find what was wrong first of all.
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  #2  
Old 9th May 2010
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Quote:
Originally Posted by ilijanic View Post
Hi,

I changed the gas pump and filter on my 1999 saab 93 few months ago. Now the car won't start again, it would only start if I put gas directly into the intake. I changed new filter for the gas again, but it would still not work. What could possibly wrong with my car? And, how could I find out?

Thank you everyone, and thanks for helping me few months ago how to replace my gas pump and find what was wrong first of all.
If i was you i would disconnect the fuel hose at the inlet manifold and see if any fuel pumps out when you turn the engine over on the starter, if none pumps out then you have most likely got a blockage in the fuel line somewere.
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  #3  
Old 10th May 2010
ilijanik ilijanik is offline
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How to disconnect the fuel hose at the inlet manifold without breaking it? Should I pull, twist.....??
l
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  #4  
Old 10th May 2010
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This requires a special tool that opens an internal clip.
Haynes, bless their cold heart, has a little section on this.
HF sells the tool; one can also make this, I believe.
Its still tricky.
The days of having fuel lines opening or separating due to vibration or minor accident are over.
Have you tested your CPS(good for 100-150K miles)?
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Old 10th May 2010
ilijanik ilijanik is offline
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No I did not test my CPS. How do I do that. Thanks for your help!
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  #6  
Old 11th May 2010
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I believe you can test a cps by checking its resistance iirc....Im sure Earthworm knows for sure
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Old 11th May 2010
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Quote:
Originally Posted by ilijanik View Post
No I did not test my CPS. How do I do that. Thanks for your help!
http://www.saabcentral.com/forums/sh...d.php?t=102007

http://www.saabcentral.com/forums/sh....php?p=1116298

http://www.saabcentral.com/forums/sh...d.php?t=102007

Test the CPS both cold and warm and observe any differences;I changed mine when it was still good at 150K or so.

http://www.saabcentral.com/forums/sh...d.php?p=968532
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Last edited by earthworm; 11th May 2010 at 03:38 AM.
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  #8  
Old 12th May 2010
ilijanik ilijanik is offline
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My CPS has 488 Ohms and my saab still wont start. Before I erased the codes OBD codes were: PO300, PO171 and P1171. After I erased the codes the engine check light is not coming on while I am cranking to start the motor? What can I do next? Appreciate your help and support guys!!!
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  #9  
Old 12th May 2010
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0171 1171
http://www.saabcentral.com/forums/sh...ad.php?t=77241

im wondering if you can try a fuel line cleaner, one of those cleaners they sell at autozone..
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  #10  
Old 17th May 2010
ilijanik ilijanik is offline
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OK, this is the summary
-I have gas pressure after the fule filter cople of second on contact and with cranking
-The car runs if I pure gas straight in to the intake.
-I replaced the CPS. (the old one had good ohms)
-Check engine light is not coming on while I am cranking.
- The OBD codes were: PO300; PO0171 and PO1171
Still can not sart the saab. What can I do next?
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  #11  
Old 17th May 2010
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I would leave the ignition turned off (key out), and check the fuel pump and fuel pressure on its own, and make sure the pump will stay running and make good pressure.

You can do this either from the fuel pump wire connector under the access cover below the rear seat, or from the socket for the fuel pump fuse (fuse removed). In either case, all you have to do is connect battery power to the fuel pump circuit (lower fuse terminal or blk/grn wire), and the fuel pump should run and stay running until you cut the power. You should be able to hear the pump run, fuel pressure should be right on the mark and steady, etc.

If the pump runs but the fuel pressure is not correct, it could be something as simple as a few particles of dirt caught in the FPR.

edited to add:

P0300 is a misfire code normally associated with ignition module problems (DIC, IDM), but it could also happen because there is not enough fuel pressure to get good ignition.
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  #12  
Old 17th May 2010
ilijanik ilijanik is offline
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How do I measure the pressure in the gas line?
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  #13  
Old 17th May 2010
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Quote:
Originally Posted by ilijanik View Post
How do I measure the pressure in the gas line?
Fuel pressure gauge and hose adapter. If you have not done this before, get some help or at least read some directions carefully, you don't want spilled gas while you have a jumper cable connected to a fuse socket...
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  #14  
Old 18th May 2010
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Just had another thought about your problem. A bad fuel pressure regulator can also cause the symtoms that you discribe ( worn or holed diaphram ).
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