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  #1  
Old 1st June 2009
T-MAC T-MAC is offline
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Question 1999 Saab 9-5 SE - stalling problems.. ?

Hello,

I have a 1999 Saab 9-5 SE with 97k miles. For some reason sometimes before I stop the car at a traffic light the engine will die. I can restart the engine fine. This keeps happening at random. Its very strange. I have replaced the fuel filter. I checked the MAF and it is clean, the air filter is clean, the throttle body I cleaned (with a toothbrush and throttle body cleaner) and I replaced the oil separator with the dealer "kit" since it had deteriorated into a black bbq pit inside the pcv hoses and caused them to split (stinky!). I replaced the fuel filter recently. The spark plugs are tan and replaced about 4k miles ago.

I am still having this stalling problem. I have no codes in the computer. Anyone have any ideas what is causing this issue? Crank sensor possibly? The DIS looks ok and is not burned.. but I have no idea how to test it.

Thanks everyone!
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  #2  
Old 2nd June 2009
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hiros hiros is offline
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Have you change the Fuel pump? Maybe the fuel pump is failing.
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Old 2nd June 2009
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I agree with the possible fuel pump diagnosis. A shop can check the pump's current draw with a scope to see if there are any dead spots (a sign of failing pump).

Also check the turbo bypass valve. The small hose should hold vacuum when you suck on it. Air should only be able to pass between the two large hoses while vacuum is applied to the small one. Sometimes this will light the CEL and set a P1110 code but not always.
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Old 2nd June 2009
Aja1 Aja1 is offline
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My 2001 is in the shop now with what sounds like the same issue although our car also experience some bucking during driving. I'll let you know what the diagnosis is. FYI it took a while for the engine light to come on for this problem.
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Old 2nd June 2009
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Cleaning the throttle body is not a bad idea either way. Even the smallest amount of soot can make a car run rough - and of course would be linked to any MAF woes without there necessarily being anything to see.
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Old 2nd June 2009
Aja1 Aja1 is offline
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Just got the diagnosis:

crank shaft sensor $378 installed.
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Old 2nd June 2009
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good lord! thats alot of money. DIY and save yaself some cash. it aint to hard.
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Old 2nd June 2009
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Man I wish! I'm just not equipped. Out of curiosity, what is involved?
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Old 2nd June 2009
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http://fixmysaab.com/9-5_repair/cps/intro.asp?nsteps=2
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Old 5th June 2009
T-MAC T-MAC is offline
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Unhappy still stalling.. :(

Hi Everyone,

Well I had a mechanic up the hill look at it and he said he though the fuel pump relay was bad. He replaced the relay and tested it and said he thinks the problem is solved. The next day it stalled again. Good thing he didn't charge me. The stalling only seems to occur while the engine is HOT. I am going to look into the fuel pump check valve tomorrow.

I added a can of fuel injector cleaner for good measure, it didn't help much but its been quite a while since I have cleaned the injectors (I always use quality 86 octane gas: chevron, shell or 76.. no discount junk)

Is there any way I can test the crank shaft sensor without a TECH-2?

How could I test the fuel pump? I assume testing the check valve would be to see if its obstructed by dirt?

Thanks!
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