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pj964blue
Newbie


Joined: 31 May 2018
Posts: 6



PostPosted: Tue Jun 26, 2018 2:44 pm    Post subject: 964 Revcounter malfunction. Reply with quote

Hi
Newbie on the forum so as they say...bear with!

Rev counter on my 964 tip is up to no good!
After about 3\4 of an hours driving it suddenly dips to zero, then bumps along the bottom or even just sits there. Sometimes it shoots up again with a touch of throttle and sometimes if I give it throttle when it's sitting at about 2000rpm it actually dives DOWN to the zero again! Totally random and of course won't do it to order! The following morning back to normal!
I do have Julian Reap on the case but as it's already been through his hands to his man in Holland and six months later it's pulling the same trick he's scratching his head a bit.
Anyone else had the same or very similar problem?

Cheers.
 
  
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Gazc2
Albert Park


Joined: 08 Nov 2003
Posts: 1734
Location: Scotland


PostPosted: Tue Jun 26, 2018 3:37 pm    Post subject: Reply with quote

can be a sign sign your alternator is on its way out, need to check the brushes/regulator/output
_________________
2007 997 Turbo & 924s in progress
1990 964 C2
1989 3.2 targa
1987 3.2 Cab
1986 3.3 Turbo
1986 944 2.5 (later fitted with a 2.7 after wife went scuba diving in a flood and popped a piston through the block)
 
  
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pj964blue
Newbie


Joined: 31 May 2018
Posts: 6



PostPosted: Tue Jun 26, 2018 4:26 pm    Post subject: Reply with quote

Thanks Gazc2, hadn't reckoned with that!
It's going in tomorrow for a fluid change and a new belt on the distributors - far as I can see it's never been done! - so I'll get the alternator checked too.
 
  
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pj964blue
Newbie


Joined: 31 May 2018
Posts: 6



PostPosted: Fri Jul 20, 2018 1:57 pm    Post subject: Reply with quote

Had it checked out at Steve Bulls earlier this week, alternator seems fine, distributor feed to revcounter fine although some slightly dodgy wiring from the dizzy has now been rectified.
After a couple of 1 hour plus trips however its stopped misbehaving! Typical but not complaining. That's cars for you!
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 12574
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Fri Jul 20, 2018 4:54 pm    Post subject: Reply with quote

I've got a mint standard rev counter 964/993 if you need a replacement. Rubicon coloured dial which you'd need to swap out for black or go for a bold colour for contrast. £150 Thumb
_________________
Alfa Romeo’s 4C is everything a Italian sports-car should be: it’s gorgeous to the point of pornography, distinctive enough that nobody will ever mistake it for a Porsche, handles like it’s on rails and steers like a kart.
 
  
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pj964blue
Newbie


Joined: 31 May 2018
Posts: 6



PostPosted: Sat Jul 21, 2018 6:39 am    Post subject: Reply with quote

Thanks for the offer Zingari, but not only is it a tip but with OBC as well. That part is all OK.
So for the moment still work in progress.
Thanks again.
 
  
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