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Michael Sundler
Newbie


Joined: 31 Dec 2015
Posts: 3



PostPosted: Fri Nov 04, 2016 6:54 pm    Post subject: 911 964 Turbo Electrical or Fuel? Reply with quote

My 964 turbo has become reluctant to start and when it does fire requires feathering on throttle until the engine catches fully then runs ok. It has gradually got worse and now will not start at all! When turning over the exhaust smells of fuel so am thinking it is probably electrical. Crankcase sensor has correct output but HT output seems missing (most of the time!) Are there relays that prevent HT output if fuel pressure is wrong? Any of you experienced guys any clues for me. Help very much appreciated. Mike
 
  
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wagonface
Barcelona


Joined: 04 Apr 2006
Posts: 1429
Location: Esher

1991 Porsche 964 Turbo

PostPosted: Tue Jan 10, 2017 1:55 pm    Post subject: Reply with quote

Have you had the metering head tested? Over time the seals etc degrade and then you get a dodgy mixture.

My 964T had the same symptoms - struggle to start, lumpy idle, rich mixture. Fuel pressure tested fine at idle, but going up and down the revs it was obvious the head needed a refurb.
_________________
964 3.3 Turbo
ex: 996 C2 Cab
 
  
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RichiRich
Österreich


Joined: 23 Sep 2009
Posts: 998
Location: Luxembourg


PostPosted: Tue Jan 10, 2017 2:21 pm    Post subject: Reply with quote

I had something similar once with mine, though it was a while back, so the details are not so clear - it turned out to be a split 'O' ring. Once replaced, the car was fine.

Don't ask me any technical questions about what and where, because I'm not a mechanic Dont know
_________________
2000 996 Turbo
Speed Yellow / Black

Ex - 2003 996 Carrera 4S
Ex - 1992 964 Turbo X33 (#777)
 
  
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Michael Sundler
Newbie


Joined: 31 Dec 2015
Posts: 3



PostPosted: Tue Jan 10, 2017 8:53 pm    Post subject: Reply with quote

Thank you both so much for taking the trouble to reply. You were both very close to the solution(s). That was the fundamental issue as I thought that there was simply one problem that deteriorated until the car would not start. However the initial problem of starting was the seal on the inlet tract causing erratic running until the engine revs came up. However, additionally the after market immobilizer that my insurer had originally said I needed fitting finally failed causing the car not to start. I am told that is not uncommon after 5 or so years. Now disabled (and with tracker fitted) all seems fine again!
 
  
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RichiRich
Österreich


Joined: 23 Sep 2009
Posts: 998
Location: Luxembourg


PostPosted: Thu Jan 12, 2017 8:17 pm    Post subject: Reply with quote

Glad you got it sorted thumbsup

Now go and enjoy... Very Happy
_________________
2000 996 Turbo
Speed Yellow / Black

Ex - 2003 996 Carrera 4S
Ex - 1992 964 Turbo X33 (#777)
 
  
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