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NorfolkWill
Newbie


Joined: 21 Jun 2019
Posts: 6



PostPosted: Tue Jul 16, 2019 1:48 pm    Post subject: Reply with quote

A quick update for everyone, and for the benefit of anyone who encounters a similar issue in the future (I hope not for their sake!)

Turns out it was a burnt out variocam solenoid (bank 2) that did the damage. I knew I was running with bank 1 out of action for a few months, but kept putting off getting it replaced.

So, as someone now speaking from experience - as soon as you think/know one of your variocam solenoids has gone (a rough idle is the obvious symptom), do get it changed ASAP if you can!

Thanks to everyone for their support and suggestions - much appreciated.

Will
 
  
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Luddite
Nürburgring


Joined: 18 Dec 2018
Posts: 408
Location: Scotland


PostPosted: Tue Jul 16, 2019 3:34 pm    Post subject: Reply with quote

NorfolkWill, many thanks for taking the time to post the actual cause of your burned out ECU hopefully it will save some other owner suffering similarly.

I`m guessing here, though wondering if the solenoid burned out due to some sort of extra mechanical resistance in the variocam operation, which then may have caused the solenoid to suffer overload (draw excessive current) and eventually burn out, (shorting out internally) which then overloaded the ECU outputs for the solenoid causing internal burning of the ECU ..?

Of course the solenoid could have burned out due to vibration, eventually breaking down insulation in it`s windings..? Perhaps a fuse on those outputs could save an ECU..?

Just thinking in type and claiming zero automotive digital experience.. Question
 
  
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uk996
Silverstone


Joined: 09 Jan 2018
Posts: 131
Location: Home Counties


PostPosted: Tue Jul 16, 2019 6:59 pm    Post subject: Reply with quote

thanks for posting the follow up Will, always good to see how something is fixed a d the knowledge will be kept in the 911uk hive mind.
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eabeukes
Monza


Joined: 30 Jan 2018
Posts: 173
Location: Aylesbury

1999 Porsche 996 Carrera 2

PostPosted: Wed Jul 17, 2019 9:21 am    Post subject: Reply with quote

Any chance you could post the part numbers for the solenoids?
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Wed Jul 17, 2019 6:24 pm    Post subject: Reply with quote

Luddite wrote:
NorfolkWill, many thanks for taking the time to post the actual cause of your burned out ECU hopefully it will save some other owner suffering similarly.

I`m guessing here, though wondering if the solenoid burned out due to some sort of extra mechanical resistance in the variocam operation, which then may have caused the solenoid to suffer overload (draw excessive current) and eventually burn out, (shorting out internally) which then overloaded the ECU outputs for the solenoid causing internal burning of the ECU ..?

Of course the solenoid could have burned out due to vibration, eventually breaking down insulation in it`s windings..? Perhaps a fuse on those outputs could save an ECU..?

Just thinking in type and claiming zero automotive digital experience.. Question


i'm pretty sure its just a case of the solenoid wires shorting together internally .. i've seen this a couple of times over the years but not one that had caused this kind of damage .. always possible though with wiring .

There is no fuse or any kind of protection as standard .
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Luddite
Nürburgring


Joined: 18 Dec 2018
Posts: 408
Location: Scotland


PostPosted: Wed Jul 17, 2019 7:50 pm    Post subject: Reply with quote

Iain, many THANKS for taking the time to provide the answer to my ECU question, very much appreciated. I can understand that when a solenoid is diagnosed as damaged internally that it may be normal just to replace it, thus problem solved.. I on the other hand have been known to cut things apart to try to determine the cause of failure..(-: My thinking on fusing was as a possible modification that may have been a worthwhile consideration if such failures were a semi regular occurrence.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Wed Jul 17, 2019 8:05 pm    Post subject: Reply with quote

The lead where the wiring exits the solenoid is at a sharp angle .. this seems to be the place it shorts out at .. a design issue perhaps Dont know

Either way it's rare but does happen .. but a blown ecu is unlikely but possible .

This is only applicable to early cars with vario cam and not variocam plus .
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NorfolkWill
Newbie


Joined: 21 Jun 2019
Posts: 6



PostPosted: Thu Jul 18, 2019 1:10 pm    Post subject: Reply with quote

eabeukes wrote:
Any chance you could post the part numbers for the solenoids?


I don't have them I'm afraid - all done through my Indy mechanic! I'm sure someone on this thread will be able to help though...
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Thu Jul 18, 2019 6:53 pm    Post subject: Reply with quote

NorfolkWill wrote:
eabeukes wrote:
Any chance you could post the part numbers for the solenoids?


I don't have them I'm afraid - all done through my Indy mechanic! I'm sure someone on this thread will be able to help though...



No. 10 here ..

https://www.deroure.com/diagrams.asp?TBL=2520&MAK=3&MDL=25&SMA=0&SMO=0&ST=&SC=0
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