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OliverBloom

930 engine cut off

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Hi all. I am experiencing what feels like the onset of a problem with my 3.3l 930. I had the engine cut off while driving off from stationary. The engine was still cold. I managed to get it stared after a couple of minutes. The starter has been working fine. The fuel pump fuses are OK and I quickly checked that the pumps work by alternately taking out each of the 2 fuses. I have not tested whether the yellow relay in the engine compartment is good. What might be relevant, is that I have recently noticed the car being slower to start. Similar to a weak battery, however I have checked that and even kept the car on a ctek since, so  as to eliminate it. Any thoughts?
much appreciated!

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So it's been quite the journey; long and expensive.

What started as cleaning corroded wires and doing all connections over at the front fuse box ended up with:

  • new fuel pumps (preventative as one was noisy and probably starting to give up the ghost)
  • replacement front and back fuse boxes from ClassicRetrofit
  • new or refurb'd 'usual-suspect' relays & sensors (i.e. air flow sensor, speed relay, overboost switch)
  • doing away w all non-stock wiring work that had been done over the years
  • general electrics tidying up
  • CDI from ClassicRetrofit
  • adjustable WUR from Leask

Basically, almost all the labyrinthine fuel system components have been replaced/upgraded, while we were at it. As i said a long and expensive project.

Car now runs smoother than ever. May be the ££££ spent but it feels quicker too.. (for whatever it's worth, dyno'd at 364bhp/281whp -car has a few enhancements).

Anyone runs up to similar trouble, happy to share some of my -at times painful- experience..

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Well done Oliver!

Nothing ever cheap on these cars!

The proverbial can of worms........so you never really pinpointed the actual single guilty component?

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Cheers all. The culprit was the CDI. Having said that, there were loads of questionable repairs from years past (like shorting some fuses & relays) and the relays were literally hanging by a thread. It would be wrong to upgrade to the ClassicRetro box and leave the corroded wiring and the rest..Also, decided to install Leask's adjustable WUR (a bit of a pain getting this from the US) to tune the car properly and (as) perfectly (as possible). 

I hope never to have to look at electrics again!

Edited by OliverBloom
some spelling corrections

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Good job and thanks for using our products!  364bhp is pretty handy!

Most of the failed 6 pin CDI units we see are from Turbo Cars.  It’s the same unit as fitted to the SC but the Turbo engine bay is a much hotter environment.   It is more cramped so there is less air movement for cooling the unit.  

Just goes to illustrate that heat cycling is a major contributor to electronic component failure.

 

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Hi Guy's

Thanks for the update

I had a rebuilt one fitted in 2015 by SCS @ £325.00 plus vat and labour @ 56,000 miles, I think it was just before Jonny started doing them, shame as I would have had one of his! but if the original lasted some 26 years not too bad

kev

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