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Engine Management light on, message underneath reads reduced power, ?

Hi Kirk,

The most efficient way to go is to hook-up some Porsche-specific diagnostics to find out what error codes have been flagged-up. Unless the car is under warranty, any reputable Porsche Independent will be able to help, and they’ll be much cheaper than the Porsche dealers.

Jeff
 
Yes Kirk, you may need some Porsche-specific diagnostics [PIWIS or equivalent] to resolve the issue owing to the limitations of some more basic analysers. Often they will only pick-up emissions-related problems like lambda sensor failures.

Just some other thoughts. Have you recently fuelled the car [possible fuel contamination]? Is the fuel filler cap secure?

Good luck!

Jeff
 
Kirk,

Any decent local garage should be able to diagnose the fault, generally this light is the result of an emissions issue. As Jeff says it could be fuel related. If it runs OK it could also be a dodgy sensor or connection or the emissions circuit. If it is running rough, suspect a coil that has died or a faulty Variocam control solenoid. There are diagnostic tools out there for £200+ that can diagnose all of the above. Examples are Foxwell NT range (I have an NT650 Elite which covers most marques and models) and an older Icarsoft PORII which is Porsche specific. Alternatively just go to any decent local garage and ask them to diagnose. If they deal with modern cars, they will have the capability to diagnose your fault without PIWIS. PIWIS can do much more, e.g. coding replacement electronic components to the car's CANBUS system but generally not necessary for most faults.
 
Thanks for the direction. Kirk. Going to start with the fuel, sure I can find someone I know with the equivalent or same, diagnostic tools as your Ian. Kirk.
 
Whereabouts are you. ?

what other symptoms have you got. - misfire? Cutting out ? Hard to start ? Not accelerating ? Smoke on startup ?
 
Near Glasgow, not really any other symptoms, drove it hard today with fresh fuel, hardly if any noticable difference in power? But light still on. Kirk.
 
Too far away to help. There’s a code behind that light. Need to understand what is triggering it.

If you can’t get it to someone with diags with Porsche smarts then consider an icarsoft por v2 or v3 - or my personal preference a foxwell nt530. If you could buy from Amazon and then find that it didn’t suit your needs then you could return it - if you get my drift.
 
I would have thought that any diagnostic analyser would have thrown-up an emission-related issue [O2 sensor/cat], and you say that there don’t appear to be any ignition-related problems [plugs/coil packs].

I’d follow Paul’s advice, but one simple thing you could try is to clean the MAF sensor just to see if that has any impact on the problem.

Jeff
 
Good point. You can disconnect the maf and the car will run with a default config - easy way to isolate a maf issue.

one thing. The 987.2 3.4 engine uses a MAP not a MAF - so any guidance you find about MAF may not directly apply if it’s a 3.4 (same basic principles apply - but they are physically different )
 
MAF vs MAP? Good to know Paul.👍

It seems that MAP sensors are more robust and rarely require cleaning, so hopefully just disconnecting a MAP sensor will have the same effect as that for a MAF sensor.

Oh for a simple SU carburettor!😀

Jeff
 

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