 Is there any way to tell if my L-jet brain is dead without swapping it |
|
|
|
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. |
|
|
| jd74914 |
 Apr 18 2007, 10:47 AM
Post
#1
|
|
Its alive  Group: Members Posts: 4,850 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States  |
Hi guys, heres the problem.
A few months ago my car was running great. I had just rebuilt the engine and put everything back on. After fixing some grounding problems it ran perfectly. Then, I went on vacation, came back and did some welding and forgot to unhook the brain when I unhooked the battery. After this the car wouldn't start. It wasn't getting any fuel. The coil also got really warm at one point, so I replaced it with another known good, new one I had. Now with the new coil, and a new fuel pump (I also had a known good pump) put in, the car still won't start. It turns over fine, but it won't even run for a second on the cold start valve (IMG:style_emoticons/default/sad.gif) Is there a problem with the brain or is there something else I should look for? I can't think of any other things to go bad. (IMG:style_emoticons/default/idea.gif) I'm pretty sure the points are good. Its a 74 L-Jet BTW |
   |
 
|
  |
Replies
| bd1308 |
Apr 18 2007, 08:29 PM
Post
#2
|
|
Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
alright here's what you need to do:
After the system was installed in my car, nothing worked. The Ignition turns the IGN relay on the relay board, which feed power to the dual relay. with the car off, you should be able to open the dual relay and press down either relay--one should turn the fuel pump on, and the other should turn the FI computer on (click! goes all injectors once) when you turn the key, you should hear two relays ( or more I forgot) one should turn on on the relay board, and one you should hear from the dual relay--if your dual relay doesnt click, its either bad or you need to check the relay board (on the 914). i have a dual relay i can send you for testing--its in not prefect shape, but it'll do for testing and you wont have to open yours. |
|
|
|
Posts in this topic
jd74914 Is there any way to tell if my L-jet brain is dead without swapping it Apr 18 2007, 10:47 AM
jimkelly guess you gotta check for spark, is fuel pump comi... Apr 18 2007, 11:11 AM jd74914 The pump isn't coming on at all. Thats what ha... Apr 18 2007, 11:39 AM r_towle remove the big ass Air flow meter valve from the l... Apr 18 2007, 12:14 PM jd74914 Ok, Thanks for that thought Rich.
I'll try pr... Apr 18 2007, 02:10 PM Dave_Darling The pump should also run when the starter is crank... Apr 18 2007, 02:50 PM
jd74914
The pump should also run when the starter is cran... Apr 18 2007, 02:58 PM SLITS The single yellow wire to your starter is from you... Apr 18 2007, 03:18 PM ChrisNPDrider I just went through this with D-jet and the soluti... Apr 18 2007, 03:32 PM bd1308 that yellow wire goes to the bottom RIGHT pin on t... Apr 18 2007, 03:36 PM jd74914 Bottom right is i'm looking from the battery t... Apr 18 2007, 03:41 PM bd1308 trunk Apr 18 2007, 04:04 PM jd74914 mine was always plugged into the left thanks Apr 18 2007, 04:06 PM computers4kids
mine was always plugged into the left thanks
Mi... Apr 18 2007, 07:55 PM bd1308 if you stood behind the trunk and was looking at t... Apr 18 2007, 08:08 PM computers4kids
if you stood behind the trunk and was looking at ... Apr 18 2007, 08:12 PM ClayPerrine
The Ignition turns the IGN relay on the relay bo... Apr 18 2007, 09:53 PM jd74914 I think I have heard the clicks . . . I'll che... Apr 18 2007, 09:50 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 4th July 2025 - 04:00 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.