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
> No spark!, I hope it's something stupid
cuddy_k
post Apr 23 2016, 02:03 PM
Post #1


Shoot. Wrench. Repeat.
***

Group: Members
Posts: 1,300
Joined: 22-May 15
From: Westchester, NY
Member No.: 18,749
Region Association: North East States



Hi Guys,

The car is finally back in one piece and the engine cranks....but doesn't start.

Seems it's an electrical issue. Here's the setup and my testing.

I have a Mallory Unlite 4554101 dizzy with the ballast module. New Bosch coil. Positive side of the coil has the red wire from the Mallory and the positive cable from the engine harness attached. Negative side of the coil has the green Mallory wire and the negative (tach?) cable from the harness. Brown mallory wire is grounded.

When I turn on the car I get 12V on my multimeter coming out of the center of the coil. Also get 12V when attached to the red and brown outputs of the Mallory resistor.

Cranking the motor gets no spark to the plug cables (tested by attaching a plug and grounding it to the crankcase.

I'm hoping the issue isn't the ignition module in the dizzy, but signs are pointing to that. Nothing has really happened to it since I parked the car last fall, so I'm not sure what's up. Any other ideas?

Thanks SO much for your help. I'd really like to get out there and enjoy this weather...

User is online!Profile CardPM
Go to the top of the page
+Quote Post
ejm
post Apr 23 2016, 02:15 PM
Post #2


I can see the light at the end of the tunnel
****

Group: Members
Posts: 2,441
Joined: 3-February 03
From: Massachusetts
Member No.: 224
Region Association: None



The Unilite module is prone to failure on engine shut down when using the wrong type ignition wires. Mallory recommends spiral wound wires. If you have copper or steel core wires you may have killed the module last fall.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JimN73
post Apr 23 2016, 02:32 PM
Post #3


Senior Member
***

Group: Members
Posts: 534
Joined: 6-October 07
From: Gig Harbor
Member No.: 8,192
Region Association: Pacific Northwest



Here's the Mallory test procedure for the ignition module.

https://search.yahoo.com/search;_ylc=X3oDMT...ss&ei=UTF-8
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
cuddy_k
post Apr 23 2016, 02:47 PM
Post #4


Shoot. Wrench. Repeat.
***

Group: Members
Posts: 1,300
Joined: 22-May 15
From: Westchester, NY
Member No.: 18,749
Region Association: North East States



Thanks so much for the speedy responses. Wires are the correct type.

Jim...your link didn't work, but inspired me to search for videos on the procedure, posted below in case anyone in the future has this issue...

https://www.youtube.com/watch?v=PSiw4thM21k

Will check and post.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
McMark
post Apr 23 2016, 02:58 PM
Post #5


It's turbo-licious.
***************

Group: Admin
Posts: 20,140
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: North East States



Disconnect the "positive cable from the engine harness" from the positive side of the coil. Test for power on that wire, alone, with the key on.

It's easy to get the power/tach wire switched. I always confirm by testing which is which before hooking them up.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
cuddy_k
post Apr 23 2016, 03:19 PM
Post #6


Shoot. Wrench. Repeat.
***

Group: Members
Posts: 1,300
Joined: 22-May 15
From: Westchester, NY
Member No.: 18,749
Region Association: North East States



Thanks Mark. Forgot to mention that I checked that first (IMG:style_emoticons/default/wink.gif).

Tested the unit and is looks as if the module is bad. Another few days to wait...
User is online!Profile CardPM
Go to the top of the page
+Quote Post

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: 17th July 2019 - 09:40 PM