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2004 Boxster Engine IMS failure. Replaced engine and have issues


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I have a 2004 Boxster S with IMS failure.  I purchased a used 2002 engine from a Boxster S and swapped it in.  The vehicle does not run right.  I assume it has something to do with Variocam.  Has anyone done this swap or does anyone know how to resolve this issue?  A simple tune can take care of it?  

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I have a 2004 Boxster S with IMS failure.  I purchased a used 2002 engine from a Boxster S and swapped it in.  The vehicle does not run right.  I assume it has something to do with Variocam.  Has anyone done this swap or does anyone know how to resolve this issue?  A simple tune can take care of it?  

 

Welcome to RennTech :welcome:

 

Along with potential fuel system issues, the 2002 engine used a 7.2 DME and is VarioCam, while your 2004 car has a 7.8 DME and VarioCam+.   To make this work, you either have to change the car back to the earlier DME, or update the engine to the later version of VarioCam.  The 7.8 DME is not backwards compatible.

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I have a 2002 DME ready to go.  The vehicle still will not start.  I looked at wiring and there are a few minor changes in the wiring but I don't think those are related to the no start issue.  Immobilizer, Key and DME were replaced from a wrecked 2002 car into the 2004 car.  THe cluster lights up and will not shut off.  If you unplug DME, the cluster shuts off till I insert key again.  

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I have a 2002 DME ready to go.  The vehicle still will not start.  I looked at wiring and there are a few minor changes in the wiring but I don't think those are related to the no start issue.  Immobilizer, Key and DME were replaced from a wrecked 2002 car into the 2004 car.  THe cluster lights up and will not shut off.  If you unplug DME, the cluster shuts off till I insert key again.  

 

It is not just a matter of finding a DME to match the engine; your chassis made wider use of CAN Bus communications for the control module network functions, while the older DME did not have as many control modules and routed communication's differently.  There is a huge technology gap between the 7.2 and 7.8 DME's.

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