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Old 10-22-2007, 06:41 PM   #1
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Bad Idle Problem

I have a 99 9-5 auto that has started acting up today. When I start the car it idles for a second and dies. I can get it to start after 5+ times. Any idea what this could be caused by? I've replaced the TPS and throttle body in the last year with brand new parts. Could this be the maf?
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Old 10-22-2007, 06:52 PM   #2
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Hard to say , but it sounds like it might have gone into limp home mode. Are you getting any check engine lights? If not it could be a vacume leak also, but both of these should set a light.
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Old 10-22-2007, 06:58 PM   #3
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check for vacuum leaks, blown off intercooler pipes, limp home mode.

BUT, to me it seems like a CPS. (or is that what you meant by TPS)
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Old 10-22-2007, 07:01 PM   #4
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check for vacuum leaks, blown off intercooler pipes, limp home mode.

BUT, to me it seems like a CPS. (or is that what you meant by TPS)
I meant CPS One of the first things I replaced when we got the car, as it's my wife's.
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Old 10-22-2007, 07:07 PM   #5
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can you hear the fuel pump prime for about 5 seconds or so when you turn the key to "ON" but dont start it?

Can you hear this same noise when the car wont start?
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Old 10-22-2007, 07:34 PM   #6
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can you hear the fuel pump prime for about 5 seconds or so when you turn the key to "ON" but dont start it?

Can you hear this same noise when the car wont start?

I can hear it prime. I just swapped the DEI Casette and it seems to start a lot faster than before. Could this have been caused by a bad DEI?
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Old 10-22-2007, 08:06 PM   #7
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With the whole DI system, anything is possible.
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Old 10-22-2007, 09:17 PM   #8
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With the whole DI system, anything is possible.


Well, I guess I'll find out tomorrow or this week if this has cured the problem.

Thanks for all the imput
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Old 02-29-2008, 09:44 AM   #9
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This is still occuring, and I have replaced the CPS. It does it intermittantly, that's why I don't think it would be an air leak, and I also did a quick check of all vacum lines and nothing out of the ordinary. It also runs really well once I get going.
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Old 03-01-2008, 10:22 PM   #10
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I've got the same problem. I'm pretty sure it's the fuel pump showing its age. Especially since you already did the CPS. Here's a DIY.
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Old 03-02-2008, 05:22 AM   #11
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This sorta happened with my dads 9-5. It was having trouble starting when it was under 40 degrees or so. Turned out to be the one way valve for the PCV system. It was also consuming a little oil with it messed up. But, he says it starts and idles better now, so you might check that its actually working.
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Old 03-02-2008, 01:59 PM   #12
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I did the fuel pump already, but it didn't fix my problem. I've also switched out the Ignition Cassette.

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Originally Posted by Al's Red Wagon View Post
I've got the same problem. I'm pretty sure it's the fuel pump showing its age. Especially since you already did the CPS. Here's a DIY.
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Old 04-01-2008, 11:18 AM   #13
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This sorta happened with my dads 9-5. It was having trouble starting when it was under 40 degrees or so. Turned out to be the one way valve for the PCV system. It was also consuming a little oil with it messed up. But, he says it starts and idles better now, so you might check that its actually working.
This just happened the last few mornings to me. It has been around 37 degrees the last 2 mornings and my 9-5 has had a little rough/blubbery start. Ironically I just ordered the PVC #7 upgrade. So, lets see if that cures it. Makes sense because it seems the original one way check in the PVC shoots the wrong way.

I just purchased it 1 month ago. It has 52k and I have been doing all of the maintenance on it. Oil, ATF, air filter etc. This weekend I will change plugs.

Last edited by alexofc69; 04-01-2008 at 11:22 AM.
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