Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Need 3.2 conversion electrical help
mepstein
post Aug 13 2017, 12:20 PM
Post #1


914-6 GT in waiting
***************

Group: Members
Posts: 19,307
Joined: 19-September 09
From: Landenberg, PA/Wilmington, DE
Member No.: 10,825
Region Association: MidAtlantic Region



I can't get my fuel pump to run unless I jumper the plug for the DME relay. The car starts and runs with the connection jumped but the fuel pump then runs all the time. Just want to know where to look and what to do.
I'm very electrically challenged so you might need to really dumb it down for me. Thanks
User is online!Profile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
Spoke
post Aug 13 2017, 07:20 PM
Post #2


Jerry
*****

Group: Members
Posts: 6,986
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None



Looks like a pretty simple circuit:

1) Ignition key provides power to 86; 85 is ground thus top relay should turn on.
2) With top relay on, battery voltage from 30 connects to 87; 87 should be 12V.
3) 87 is also top of bottom relay coil; 85b from DME must be grounded to power bottom relay; bottom relay provides path from battery (pin 30) to 87b.

Tests:
Jam a small wire in plug for 87, install relay, turn ignition on, test 87 to ground; measure 12V

Once 87 verified at 12V:
Jam a small wire in plug for 85b, install relay, turn ignition on and/or crank the engine, test 85b to ground; measure 0V. DME should provide ground at 85b. If not, the issue is with the DME.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
mepstein   Need 3.2 conversion electrical help   Aug 13 2017, 12:20 PM
Steve   You did try another dme relay? Otherwise the Bent...   Aug 13 2017, 01:06 PM
Spoke   I had a similar problem on my 930. Engine would ru...   Aug 13 2017, 01:21 PM
mepstein   Tried 4 new relays. One was solid state. Flummoxe...   Aug 13 2017, 01:30 PM
Spoke   Tried 4 new relays. One was solid state. Flummox...   Aug 13 2017, 02:04 PM
porschetub   The solder joints can also fail on them too,pop th...   Aug 13 2017, 01:36 PM
mepstein   The solder joints can also fail on them too,pop t...   Aug 13 2017, 01:45 PM
Spoke   I jumper the plug for the DME relay. Which pins...   Aug 13 2017, 02:11 PM
Spoke   Some tests with your voltmeter: put a small wire ...   Aug 13 2017, 02:14 PM
Steve   This manual is awesome!!   Aug 13 2017, 03:34 PM
Steve   RE: Need 3.2 conversion electrical help   Aug 13 2017, 03:36 PM
Steve   RE: Need 3.2 conversion electrical help   Aug 13 2017, 03:42 PM
jim912928   I hate wiring...do you have the red wire (fuel pum...   Aug 13 2017, 06:38 PM
mepstein   I hate wiring...do you have the red wire (fuel pu...   Aug 13 2017, 06:42 PM
Spoke   Looks like a pretty simple circuit: 1) Ignition k...   Aug 13 2017, 07:20 PM
mepstein   I know the dme is good. Runs fine in other cars.   Aug 13 2017, 08:30 PM
Steve   Do what Spoke suggested and put an ohm Meter on pi...   Aug 13 2017, 09:24 PM
mepstein   Do what Spoke suggested and put an ohm Meter on p...   Aug 13 2017, 09:46 PM
shoguneagle   Do not over look the DME Relay socket itself; shor...   Aug 13 2017, 10:02 PM
McMark   If you've tried the DME in other cars and they...   Aug 14 2017, 07:02 AM
jim912928   The AFM point is a good one. Before I put my 3.2l ...   Aug 16 2017, 05:30 PM
Spoke   Mark and Ray stopped by my house today to do some ...   Aug 19 2017, 09:27 PM
timothy_nd28   Things to do to finish the install: 1) Figure out...   Aug 22 2017, 09:12 AM
mepstein   Huge step to have the engine start with the turn o...   Aug 20 2017, 08:08 AM
Cairo94507   Glad to hear you resolved that issue and will be d...   Aug 20 2017, 08:23 AM
jim912928   congrats!   Aug 20 2017, 10:24 AM


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 1st June 2024 - 01:46 PM