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Hot!Porsche Carrera 1984, Turns over but will not fire up.

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ian francalanza
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ian francalanza PCGB Member
2019/09/17 13:24:48 (permalink)

Porsche Carrera 1984, Turns over but will not fire up.

A day under the car with it jacked up steeply in order to replace the Clutch Cable.. I rolled it out of the Garage without starting it.. Job done, lowered then attempted to drive out and test.... Miserable thing would spin nicely but not fire up... A real Puzzle.. Had i touched something under it or had the problem arisen from being driven again and again over the nasty cracks on the southern stretch of the M25 the night before..!
So far the possibilities that can be excluded are the DME Relay, tried a new one.. Steering Ignition Switch, replaced... I have removed one HT lead tested for a spark on the Engine Casing with no obvious visible Spark or Smell of unburnt fuel.. 
Turning over quite a few times and it kicked in as if nothing had happened.. No misfire and ran well... Switched it off and again the problem persisted and continues.. 
Next, i'm suspicious of the Bosch Alarm, checked leads and cleaned fittings.. Awaiting a second hand cheepi from Germany just to try out.. 
 
I hope i'm not going toward the ECU itself... Any ideas anyone.. Where next before I have to bite the bullet and get her lifted to a suitable establishment in Surrey..!!
Cheers 
Ian

16 Replies Related Threads

    GeoffB
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    GeoffB PCGB Member
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 13:35:28 (permalink)
    Ian
    just a thought check under the dash above pedalbox, you should see three round plugs. These connect the wiring harness through the bulkhead, I knocked one loose with my foot at the petrol station and it would not start. Make sure all are pushed fully home

    Geoff
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    ian francalanza
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    ian francalanza PCGB Member
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 13:48:14 (permalink)
    Geoff.. thanks.. I found two of them as i dislodged while changing the ignition Switch.. I will look for the third... Cheers for your response. I
    cornershop
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    cornershop Guest of the Club
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 14:21:23 (permalink)
    Check flywheel and speed reference sensors
    ian francalanza
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    ian francalanza PCGB Member
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 14:40:04 (permalink)
    Thanks for the above suggestion.. May be beyond my knowledge.. Are these easily accessible or am i moving toward Professional territory.. ?
    cornershop
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    cornershop Guest of the Club
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 14:44:54 (permalink)
    See here for initial tests:
    https://www.porscherepair.us/porsche-911-1984-1989/reference-and-speed-sensors-testing.html
     
    Removal is a bit more involved, something with limited skills I’d get a shop to do, you maybe more hands on
    cornershop
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    cornershop Guest of the Club
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 14:52:34 (permalink)
    Reading previous post, the ignition switch can be dislodged causing a no start’issue. I had this once, Engine was spinning but no lights on the dashboard - reseated the multipin behind the ignition switch, all was well.
     
    T911UK
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 15:00:32 (permalink)
    My money is on the flywheel sensors as SP suspects

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    ian francalanza
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 15:04:16 (permalink)
    Thanks for the above comments.. The ignition lights are fully on and yes.. this does look like a first going to a specialist.. I have so little to complain about over the past 20 plus years of ownership. Cheers..
    ian francalanza
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    ian francalanza PCGB Member
    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 15:16:50 (permalink)
    Regarding the Flywheel Sensor.. why would the engine run at all? It kicked in and i drove it with no issues then refused to start as soon as it was Garaged..!
    993 C4
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 15:31:26 (permalink)
    How old is your Bosch alarm / immobiliser ??

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    ian francalanza
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/17 15:38:49 (permalink)
    Bosch 0 335 411 052  I can say it's likely to be +25 years old.. I do not know if original to the Model (1984).. I will need to wait for a spare from a German Ebayer just to exclude it as a possibility.. Found one for 12 quid plus shipping..
    What have i touched on this darn car!!.. So many wires... A Very complex, yet has been ,,, Very reliable beast..!
    T911UK
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/18 07:37:45 (permalink)
    The sensors are very susceptible to heat, when hot they can either short out or go open circuit, when cold they can do the same

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    ian francalanza
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/18 09:57:32 (permalink)
    Ok thanks all..  Reckon an expense is on the cards.. Now to find the knowledge in my locality..! I'm in the Reigate area.. any recommendations?
    cornershop
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/18 11:07:25 (permalink)
    Nine excellence in Horley
     
    RSR engineering nr Dorking (I think)
    ian francalanza
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/20 14:07:54 (permalink)
    Some news...  Removed the Reference and Speed Sensor Sockets engine Mounted and cleaned the pins..  Fiddled with the cluster of cables that then sinks down toward the Clutch casing.. fires up in all its glory...  Was quite surprised and hugely relieved as the Engine had been out in July for a new Clutch. So maybe the movement might have prompted this incident; this moment of doubt!!!... Cheers for all your comments and directions..  Now out to burn some carbons....

     

    cornershop
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    Re: Porsche Carrera 1984, Turns over but will not fire up. 2019/09/20 16:46:03 (permalink)
     Good news, it may not be a permanent fix but at least you know what to wiggle /change.
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