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 )

6 Pages V < 1 2 3 4 5 > »   
 Reply to this topicStart new topic
> L-jet wiring at coil
r_towle
post Dec 29 2005, 12:33 PM
Post #41


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
aar has vacuum hoses to it and the intake...

all vacuum lines need to be in place correctly, not monkey rigged...

This is a very touchy system versus the djet...no mony rigging allowed....

I spent several days trying to get it started and until all was correct it would not start.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 12:34 PM
Post #42


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
guess i need to go to FLAPS.

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 12:35 PM
Post #43


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
but okay, whats the deal with no power at the fuel pump when the AFM is moved?

is it that yellow wire?

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
John
post Dec 29 2005, 12:41 PM
Post #44


member? what's a member?
****

Group: Members
Posts: 3,393
Joined: 30-January 04
From: Evansville, IN (SIRPCA)
Member No.: 1,615
Region Association: None
You could jumper a ground to make the fuel pump run per this pic.

This would energize the fuel pump relay when the key is on (as long as you are still using the fuel pump relay on the relay board).



Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Dec 29 2005, 12:42 PM
Post #45


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
The deal is that you changed the wiring to the fuel pump.

I would suggest that you put the wiring correctly to the fuel pump so that the AFM controls it as it was designed...

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 12:44 PM
Post #46


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
well the issue here isnt that my fuel pump doesnt run--the issue is that, while my fuel pump runs, I get no indication that the FI system is working. I can only sumise from the bubbles that my regulator is hooked up correctly (and from the hose diagrams from Pelican it shows they are) and that I have spark. Besides from the clicking when connecting wires from the relay, I have no reason to believe that this is even on.

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Dec 29 2005, 12:46 PM
Post #47


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
hang on for a sec....

that is the djet relay setup....

I only have one relay there...

Look in the haynes manual...it shows a pic of how the relays should look and the spare wire that is connected to the open bank of tabs.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 12:49 PM
Post #48


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
HUH? (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

I have the same relay board.

I'm screwed aren't I?

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Dec 29 2005, 12:51 PM
Post #49


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
no the relay board is the same.

The LJET uses only one relay from that board.

The other relays are under the battery tray and are bigger..

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
John
post Dec 29 2005, 12:56 PM
Post #50


member? what's a member?
****

Group: Members
Posts: 3,393
Joined: 30-January 04
From: Evansville, IN (SIRPCA)
Member No.: 1,615
Region Association: None
B

The relay boards are the same D-Jet or L-Jet. It's the wire harnesses that are different. The spare relays shown in the pic are spares (I believe mainly to keep dirt out of the pin holes).

Does your fuel pump wiring still use the fuel pump relay?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 12:59 PM
Post #51


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
at this present moment, no. I have the Haynes manual and I found pin II on the relay board, so the yellow wire is connected. As soon as I get this running, I was going to go to radioshack to pick up some connectors and wire my fuel pump the *RIGHT* way.

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 01:10 PM
Post #52


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
following this troubleshooting guide for L-jet motors, I get to the part where it suggests to replace the dual relay...

is this a FLAPS part, or special order?

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
lapuwali
post Dec 29 2005, 01:15 PM
Post #53


Not another one!
****

Group: Benefactors
Posts: 4,526
Joined: 1-March 04
From: San Mateo, CA
Member No.: 1,743
You should be able to test the relays themselves. There's nothing magic about them, they work just like other relays do.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Dec 29 2005, 01:22 PM
Post #54


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
dont make it so complicated in your mind.

to make it fire and start you need gas, air and spark.

You have spark.
you need fuel.

You can run the pump all the time , and it will last for a bit, but eventually it will burn out.

So for this test, jumper it so it is running and make sure you have fuel at the injectors, at the right time...

I take out both injectors from one side, put them in baby food glass jars, run the pump and turn the motor over...

You should get fuel in each jar...if not they are not getting the signal to fire...

it is an electrical signal of something like 3volts.

Again a test light will work here also.

If you find one is getting fuel and the other is not, switch them to make sure the injector is not clogged.

Make sure you have pressure at the injector as well.

Dont be looking for relays just yet.
As I recall they control the fuel injectors, so you need to determine which one is bad, if any.

Rich

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Dec 29 2005, 01:27 PM
Post #55


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
QUOTE (bd1308 @ Dec 29 2005, 12:10 PM)
following this troubleshooting guide for L-jet motors, I get to the part where it suggests to replace the dual relay...

is this a FLAPS part, or special order?

b

I think it's a specific dual relay, last time I bought a new one it was $75.....

you should easily be able to duplicate the dual relay using the stock relay board or use 2 of the GM style square relays, I'd lean towards using the 2 GM square relays, just make sure you use insulated female spade terminals and crimp them good....GM type relay should be less than $10 each

it's pretty basic, AFM energizes 1 relay* which turns on the fuel pump...easy

the second relay gets energized via either from the 1st relay or the AFM as well which then supplies 12vdc to the injectors (the + goes thru the resistors before the injectors, very important to follow that)

*(without looking at the wiring diagram, not sure if it really supplies + or if it supplies ground to complete the circuit)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 01:30 PM
Post #56


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
now the battery is dead.

this day is good.

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jim912928
post Dec 29 2005, 01:39 PM
Post #57


Senior Member
***

Group: Members
Posts: 1,485
Joined: 8-January 04
From: Granger, IN
Member No.: 1,536
Region Association: Upper MidWest
Easy way to check if your injectors are opening/closing on an ljet before popping them off is to:

1. remove the distributer cap
2. make sure the points are closed
3. turn on the ignition
4. open and close the points (don't use a metal instrument..don't want to fry anything!)

By doing this, you should be able to hear the injectors opening/closing...you'll hear a noticble click at each one. This will tell you if you are getting juice to the injectors. If those are clicking...then you have a fuel distribution problem. Here I'd make sure you have oil the fuel lines hooked up in the right direction. I'd go look at mine but it's up in milwaukee and I'm in IN this week.

Jim
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bd1308
post Dec 29 2005, 01:48 PM
Post #58


Sir Post-a-lot
*****

Group: Members
Posts: 8,020
Joined: 24-January 05
From: Louisville,KY
Member No.: 3,501
uh, houston, no power to the injectors.

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Dec 29 2005, 01:59 PM
Post #59


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
QUOTE (bd1308 @ Dec 29 2005, 12:48 PM)
uh, houston, no power to the injectors.

b

relay problem.....do you have power to the resistor pack?

I'm guessing no....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mueller
post Dec 29 2005, 02:02 PM
Post #60


914 Freak!
***************

Group: Members
Posts: 17,146
Joined: 4-January 03
From: Antioch, CA
Member No.: 87
Region Association: None
for testing ONLY......

you could run a 12vdc + to the resistor pack and fuel pump using a toggle switch (the toggle switch would "mimic" the AFM being opened and the relay circuit activated when flipped on)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

6 Pages V < 1 2 3 4 5 > » 
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 1st June 2024 - 12:19 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...