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 )

 
 Reply to this topicStart new topic
> fuel injection not spraying
big wil
post Jun 26 2011, 12:12 PM
Post #1


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
i am trying to restore my 1973 914. it has the fuel injected 2.0. i have changed the distributor for an ignition problem that i was having and now i am not getting fuel. any ideas?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jun 26 2011, 12:26 PM
Post #2


914 Idiot
**********

Group: Members
Posts: 14,982
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Forget to plug in the FI trigger points?

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 26 2011, 12:32 PM
Post #3


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
they are plugged in... i plug the noid test light in to the injectors and get nothing
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DRPHIL914
post Jun 26 2011, 01:45 PM
Post #4


Dr. Phil
*****

Group: Members
Posts: 5,766
Joined: 9-December 09
From: Bluffton, SC
Member No.: 11,106
Region Association: South East States
QUOTE(big wil @ Jun 26 2011, 02:32 PM) *

they are plugged in... i plug the noid test light in to the injectors and get nothing


I recently had the same thing happen on a pair of injectors and the cause was the ground for that pair had come off. - its at the rearcenter of engine compartment- should be white.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 26 2011, 09:54 PM
Post #5


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
there is a wire that is toward the center rear of the engine but it is red i will definitely try and see if that is the problem. any idea where it connects too? it is not very long...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Jun 26 2011, 11:47 PM
Post #6


Jerry
*****

Group: Members
Posts: 6,978
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
Easy way to check trigger points, fuel pump, and injector operation:

Disconnect +12V from the coil.

Remove the dizzy; connect only the trigger points.

Turn the ignition to ON.

Manually spin the dizzy. If the trigger points are working the following will happen:

1) the fuel pump will run; you should be able to hear it.
2) the injectors will fire; you should be able to hear the clicks.

Don't do it too much as the injectors will be injecting fuel with the engine not running.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jun 27 2011, 07:40 PM
Post #7


914 Idiot
**********

Group: Members
Posts: 14,982
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
The red wire is likely out the bottom of the Auxiliary Air Regulator. It would be plugged in to the circuit that runs the pump. One of the white wires with a plastic box connector on the end is where it plugs in.

The AAR is not necessary to start the car. Make sure it isn't internally shorted (resistance between the red wire and the cannister should be about 13 ohms, definitely not zero!) before you plug it in, though.

Let's see. The ground connection is at the back of the motor; you usually have to move stuff out of the way and look around all of the intake stuff to see it.

The MPS also needs to be plugged in, or you won't get any injection pulses.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Hammy
post Jun 27 2011, 10:24 PM
Post #8


mr. Wonderful
***

Group: Members
Posts: 1,826
Joined: 20-October 04
From: Columbia, California
Member No.: 2,978
Region Association: Northern California
(IMG:style_emoticons/default/agree.gif)

Check your engine case grounds, and make sure your MPS is plugged in.
Also, what's the condition of your engine wiring harness? Any brittle/cracked/broken wires leading to the trigger points?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 28 2011, 06:00 PM
Post #9


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
QUOTE(Hammy @ Jun 28 2011, 12:24 AM) *

(IMG:style_emoticons/default/agree.gif)

Check your engine case grounds, and make sure your MPS is plugged in.
Also, what's the condition of your engine wiring harness? Any brittle/cracked/broken wires leading to the trigger points?

the harness looks good towards the trigger points but towards the rear fire wall at the back of the engine is a wad of wires that come together that are skinned up and some that are bare. i am starting to think about a webber conversion. the conversion price is comparable to the price of a replacement harness.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
swl
post Jun 28 2011, 06:10 PM
Post #10


Senior Member
***

Group: Members
Posts: 1,409
Joined: 7-August 05
From: Kingston,On,Canada
Member No.: 4,550
Region Association: Canada
you need to deal with them whether you have fuel injection or webers.

Spoke - brilliant!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 28 2011, 06:14 PM
Post #11


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States

(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Hammy
post Jun 28 2011, 06:54 PM
Post #12


mr. Wonderful
***

Group: Members
Posts: 1,826
Joined: 20-October 04
From: Columbia, California
Member No.: 2,978
Region Association: Northern California
Fix the bare wires. I'd definitely reconsider the Weber swap idea. Many here will tell you the same; the stock FI (when functioning properly) definitely wins in the overall drivability department. You'll probably have less power too, if the engine is stock. And the Webers and carb linkage will require constant adjustment...........
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 28 2011, 08:13 PM
Post #13


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
QUOTE(Hammy @ Jun 28 2011, 08:54 PM) *

Fix the bare wires. I'd definitely reconsider the Weber swap idea. Many here will tell you the same; the stock FI (when functioning properly) definitely wins in the overall drivability department. You'll probably have less power too, if the engine is stock. And the Webers and carb linkage will require constant adjustment...........

i would really like to keep the car all original as much as possible, the webber swap is just an idea i am keep around as a "last resort" option
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mike Bellis
post Jun 28 2011, 08:59 PM
Post #14


Resident Electrician
*****

Group: Members
Posts: 8,345
Joined: 22-June 09
From: Midlothian TX
Member No.: 10,496
Region Association: None
Put a 9 volt battery to the injector. You should hear the injector click. If so, check the trigger points. Most likely where your problem is. yes fix the bare wires with some shrink tube and see if you can get it to fire.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
big wil
post Jun 28 2011, 09:09 PM
Post #15


will
*

Group: Members
Posts: 12
Joined: 6-April 11
From: Hilliard, Florida
Member No.: 12,906
Region Association: South East States
QUOTE(kg6dxn @ Jun 28 2011, 10:59 PM) *

Put a 9 volt battery to the injector. You should hear the injector click. If so, check the trigger points. Most likely where your problem is. yes fix the bare wires with some shrink tube and see if you can get it to fire.

i like that idea i will try it and see what i come up with
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

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: 9th May 2024 - 08:30 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 ...