Notices
911 Forum 1964-1989
Sponsored by:
Sponsored by: Intercity Lines, LLC

Relays.... Which are the critical ones to replace?

Thread Tools
 
Search this Thread
 
Old 04-01-2023, 06:57 PM
  #1  
ercando
Track Day
Thread Starter
 
ercando's Avatar
 
Join Date: Oct 2022
Posts: 23
Received 2 Likes on 1 Post
Default Relays.... Which are the critical ones to replace?

87' Carrera Targa. What are the critical relays to replace? Any other known electronic weak spots? TIA.
Old 04-02-2023, 08:00 AM
  #2  
Vane
Addict
Lifetime Rennlist
Member
 
Vane's Avatar
 
Join Date: May 2001
Location: Finland
Posts: 242
Likes: 0
Received 46 Likes on 31 Posts
Default

Here you could follow the old "rule"; If it ain't broken, don't fix it.

But it is not a bad idea to have a spare DME relay in your glove box.
Targa is an open car, so water might get to the Motronic box under driver seat.
You could check if there is any trace of water around it.

The fuses are also the old style, you could rotate them in their sockets.
In my '85 3.2 have no relays failed so far. But the head temp sensor in cylinder #3 failed,
and the crankshaft position sensor failed. Alternator carbons and bearings had to be replaced.
That's all electrical failures in my car.
The following users liked this post:
ercando (04-02-2023)
Old 04-02-2023, 10:31 AM
  #3  
TexasPorschelover
Three Wheelin'
 
TexasPorschelover's Avatar
 
Join Date: Apr 2017
Posts: 1,774
Received 779 Likes on 344 Posts
Default

These are great solid state dme relays

https://www.ftech9.com
The following users liked this post:
ercando (04-02-2023)
Old 04-03-2023, 09:54 AM
  #4  
DonD964
Advanced
 
DonD964's Avatar
 
Join Date: Mar 2023
Location: Chicago, IL
Posts: 80
Received 7 Likes on 6 Posts
Default

I know there many critical relays but the most critical is the DME (aka digital motor electronics). This at least on my 964 controls the fuel pump and the ECU.
Don



Quick Reply: Relays.... Which are the critical ones to replace?



All times are GMT -3. The time now is 10:11 PM.