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Dave928
 Post subject: 928 "Limp Home Mode"
PostPosted: Mon Mar 08, 2010 4:07 pm 
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Does anyone know about "Limp Home Mode" on a Porsche 928 S4? I got this from a forum in USA and not sure if it could be the problem with mine
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Brett928S2
 Post subject: Re: 928 "Limp Home Mode"
PostPosted: Mon Mar 08, 2010 7:53 pm 
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Hi :)

That mode will ONLY run 4 cylinders...you can actually count the cylinders firing at idle...as in 1,2,3,4 not 1,2,3,4,5,6,7,8...etc

If its juts misfiring its NOT limp home mode....

All the best Brett :)

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Dave928
 Post subject: Re: 928 "Limp Home Mode"
PostPosted: Mon Mar 08, 2010 8:32 pm 
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Thanks for the reply. problem is, the car wont change gear (automatic)and wont go over 30mph
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JDSPorsche
 Post subject: Re: 928 "Limp Home Mode"
PostPosted: Fri Mar 19, 2010 10:53 am 
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Limp home mode is when the MAF output voltage fails and the LH ECU senses this, and goes into a default program. It might give the symptoms you describe.

What Brett is describing is 4 cylinder mode associated with MY89 and later cars with the "ignition protection relay".
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