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NON STARTING PROBLEM.

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1975turbo
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1975turbo PCGB Member
2020/09/23 16:21:22 (permalink)

NON STARTING PROBLEM.

My '75 3.0 has been running well until it became hard to start.  After leaving for about an hour it then started and ran fine.  However, now it will not start at all and there is no spark.  Whilst turning over you can hear a one off "crack" noise that appears to be an electronic discharge of some sort.
I recalled having this problem before (checking back found it was 33 years ago, in 1987!). 
At that time the dealership tested the ignition system and got it started but could not say what the problem had been except to say if it re-occured to remove the black/purple feed to the tacho, thus isolating it.  I have tried this, to no avail this time (nor do I have any idea why this should have had any bearing on the problem!).
Any ideas or suggestions greatfully received!
Chris.

2 Replies

Geoff_Fields
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Geoff_Fields PCGB Member
Re: NON STARTING PROBLEM. 2020/09/23 16:56:54 (permalink)
Loud crack would suggest HT fault. Coil, HT lead/s or Distributor.

Geoff
"Finally gave up asking to be allowed to purchase a new GT3/GT3RS."
2019 Mclaren 600LT
Previously;
2010 997 GT3
2005 997 Carrera S Hamann
1986 911 Carrera SSE
1975turbo
PCGB Member
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1975turbo PCGB Member
Re: NON STARTING PROBLEM. 2020/09/25 10:38:08 (permalink)
Thanks Geoff, I went to check through the HT components, but first thought I'd have another go at starting and it fired up instantly!  The mystery continues, but someone suggested a poor earth somewhere, possibly the coil mounting point, so I'll give that a clean for a start.
 
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