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C2 TGA
Newbie


Joined: 08 Jul 2017
Posts: 1



PostPosted: Sat Jul 08, 2017 11:01 am    Post subject: Intermittent Starting Fault Reply with quote

My car has been suffering an intermittent electrical / starting fault over the last few years and it seems the mechanics at the local Porsche independent are unable to identify the problem.

I think it's time I tried a different tack, so I'm looking for recommendations for the best auto-electrician, based in South London (as that's where the car is right now), please.

The problem manifests itself when the engine is hot (i.e. above normal cruising hot). After the engine has been switched off for a few minutes (say, to refuel), the engine won't restart. The usual ignition / warning lights come on, but nothing happens when the key is turned to the start position. After allowing the engine to cool down for 15-30mins, it will start normally. Once started, the engine runs fine. Provided the engine doesn't get abnormally 'hot', the car will always fire first time, even if restarting.

The usual diagnosis is a faulty starter motor - that's what I was told this morning, until I pointed out the garage had fitted a brand new one last year (a few hundred miles ago), when I'd been told that they had found and fixed the problem!

An immobiliser issue (it's an aftermarket unit that otherwise works fine) could be another cause, or a dodgy contact / wire somewhere which opens up when the engine is hot.

Seems to be one of those hard to identify (i.e. no fault codes generated), intermittent faults that mechanics hate these days, and it might just be more profitable to turn the focus on the potential electrical issues than keep fitting new parts.

Thanks
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11794
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Sat Jul 08, 2017 3:51 pm    Post subject: Reply with quote

Sounds to me like a classic DME relay issue. Have you tried a new one?

The is also another potential where the petrol can evaporate/run back when hot which has cropped up for a few Rennlist owners. Can't remember the fix for this but I thinks to do with the expansion tank Dont know

ETA just read the fact it won't crank. In which case I'd say an earth strap problem on the starter motor and/or the one from then-be battery terminal to the body. Swap them both. Cheap as chips.
_________________
Me? The 13th Duke of Wybourne? Here? In a sixth form girl's dormitory? At three o'clock in the morning? With my reputation? What were they thinking of?
 
  
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backitoff
Silverstone


Joined: 30 Apr 2006
Posts: 105
Location: Essex innit!


PostPosted: Sun Jul 09, 2017 7:14 pm    Post subject: Reply with quote

^^^^^^^^ what Zingari says sounds spot on.
_________________
Previous to current.......
993 C4 Coupe - 996TT Coupe - 3.2 Carrera Sport - 964 C2 Coupe.
Wish list.... 997 GT3 comfort spec.
 
  
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