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Morning sickness

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Old 07-23-2014, 03:16 PM
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eliasmazur
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Default Morning sickness

Hi.

I'm pretty sure she's not pregnant :-) , but my 1986 928S has had the case of morning sickness. Every morning the car starts fine. Then after a few seconds it goes into the morning sickness routine, as follows:

- starts idling really bad, shaking. No fuel smell. Revving up helps, but you can feel the hiccups.
- Runs like crap, like it's running on 1 cylinder. If I press on the gas it gets worse, but if I easy up it slowly gets back to normal.
- Within about 5 minutes it starts working perfectly fine. I take the highway to work and when I press on the gas sometimes it stumbles but soon it gets back to normal.
- My commute is about 15 minutes and when I get to work it's running fine. Later in the day when I leave it's still running great and drives beautifully. Idles solid and smooth.

I recently had a full intake refresh done, including cables, new distributor. I had the injectors removed and cleaned by Witchhunter.

Any help is appreciated.
Thanks.
Elias
Old 07-23-2014, 09:55 PM
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WICruiser
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Check your Temp II sensor, it may be preventing the required cold engine information from getting to the ECM.
Old 07-23-2014, 10:02 PM
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SeanR
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When you say you "had a full intake refresh done" I'd take it back to those that did it and have them diagnose the issue.
Old 07-23-2014, 10:18 PM
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82Porsche928
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I wish mine were pregnant. I could go for a brand new ob...
Old 07-24-2014, 07:23 AM
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The Forgotten On
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It could be your ISV not properly opening and allowing enough air into the intake. It's a common problem on earlier cars with a similar functioning aux air valve.

Check the resistance on your temp II sensor as they are inexpensive and relatively easy to replace as recommended above.
Old 07-24-2014, 02:05 PM
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Mongo
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I noticed a bit of morning sickness last year while mine was in for a timing belt and water pump, a year later, I have a black 1:87 928. Must have had an affair with my C280 in the garage at night as that's the only other black car I have.



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