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 )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> PLEASE HELP!, Car won't stay running and I'm out of ideas.
RockinOldSchool
post Oct 7 2006, 10:45 PM
Post #1


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
Please keep in mind I'm still a newb when it comes to teeners. Most experience is from my bug and my infiniti.

I replaced my AAR yesterday and blew a fuse (I think for the fuel pump?) on the relay board. (I'm a smart one and forgot to shut off the power first. (IMG:style_emoticons/default/headbang.gif) ) I replaced it and now when I go to start the car it cranks, fires then dies about 1 1/2 seconds later. My friend came over and swapped his relay board into my car and it still does the same.

For the basics, it's a 2 liter D-jet. Has 5 gallons of gas in the tank so it's far from out, ran fine before I swapped the AAR and blew the fuse. I figure I might've knocked something loose while I was in there but have yet to find any loose connections or otherwise.


Any ideas guys? Thanks in advance.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jd66921
post Oct 8 2006, 09:42 AM
Post #2


Member
**

Group: Members
Posts: 316
Joined: 9-January 06
From: Texas
Member No.: 5,394
QUOTE(RockinOldSchool @ Oct 7 2006, 09:45 PM) *

Please keep in mind I'm still a newb when it comes to teeners. Most experience is from my bug and my infiniti.

I replaced my AAR yesterday and blew a fuse (I think for the fuel pump?) on the relay board. (I'm a smart one and forgot to shut off the power first. (IMG:style_emoticons/default/headbang.gif) ) I replaced it and now when I go to start the car it cranks, fires then dies about 1 1/2 seconds later. My friend came over and swapped his relay board into my car and it still does the same.

For the basics, it's a 2 liter D-jet. Has 5 gallons of gas in the tank so it's far from out, ran fine before I swapped the AAR and blew the fuse. I figure I might've knocked something loose while I was in there but have yet to find any loose connections or otherwise.


Any ideas guys? Thanks in advance.


I had a similar problem on my L-Jet. I had pulled the wires out of the AAR by
mistake and they shorted out. That caused the whole car to shut down after a
second or so. The key was that I noticed the alternator and oil pressure
lights shut off, indicating a total loss of electricity. Might want to check
something like that.

Jeff
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 8 2006, 12:29 PM
Post #3


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
QUOTE(jd66921 @ Oct 8 2006, 08:42 AM) *


I had a similar problem on my L-Jet. I had pulled the wires out of the AAR by
mistake and they shorted out. That caused the whole car to shut down after a
second or so. The key was that I noticed the alternator and oil pressure
lights shut off, indicating a total loss of electricity. Might want to check
something like that.

Jeff


I'll double check that wiring, thanks for the lead. But if I remember correctly I pulled the AAR back off and it was still dieing rather than just high idling like it should with the AAR off. And far as alternator and oil pressure lights, the P.O. made his own wiring harness and didn't wire them in. So until I have some time to run the wires i'm out of luck for those two. I'm in no way talking crap. Chris did an excellent job on the car. The wiring has just aged a bit.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Oct 8 2006, 02:32 PM
Post #4


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,081
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch
john, is the fuel pump running? you can check that easily by going to the classic threads. look up andy's pump power jumper wire trick for carbed cars. the pump is powered when the key is turned to the on position. atleast i think it will work.

k
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 8 2006, 02:35 PM
Post #5


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
QUOTE(rhodyguy @ Oct 8 2006, 01:32 PM) *

john, is the fuel pump running? you can check that easily by going to the classic threads. look up andy's pump power jumper wire trick for carbed cars. the pump is powered when the key is turned to the on position. atleast i think it will work.

k



i was actually just about to do this. The pump primes but i don't know if it stays running or not. i'll post back when I know.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 8 2006, 03:32 PM
Post #6


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
So I just jumped the fuel pump via SirAndy's carb trick. The fuel pump is running fine.

However while installing the new fuse the other night I accidentally arced between the fuse terminal shown on the following picture and the volatage regulator casing through a 25amp fuse. That wouldn't fry the f.i. brain would it? (I'm always forgeting that almost everything on the car gets powered on when the battery kill is turned on. And I have the bad habit of forgeting to turn it off when I'm working on the car.)

See in yellow.
From arrow to arrow through a 25amp fuse. And the pic is from someone else's engine bay. I just used it for reference.
(IMG:http://i49.photobucket.com/albums/f284/johnkup/Untitled-1-1.jpg)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 8 2006, 03:56 PM
Post #7


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
So I just jumped the fuel pump to run continuously with the f.i. harness still on the relay board and started the car and it is still reacting the same.

See picture above in red for how the fuel pump was jumped. Ran a wire from the existing harness to the ground.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
swl
post Oct 8 2006, 04:22 PM
Post #8


Senior Member
***

Group: Members
Posts: 1,409
Joined: 7-August 05
From: Kingston,On,Canada
Member No.: 4,550
Region Association: Canada
any chance you could have disturbed the wires to the trigger points?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 8 2006, 04:29 PM
Post #9


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
QUOTE(swl @ Oct 8 2006, 03:22 PM) *

any chance you could have disturbed the wires to the trigger points?


Nope.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Oct 8 2006, 05:20 PM
Post #10


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Check your basic stuff...

Pull and injector and stick it in a jar, pull the main coil wire and turn over motor to see if you are getting fuel.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Oct 8 2006, 07:32 PM
Post #11


I. I. R. C.
*****

Group: Members
Posts: 6,719
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None
I'd check fuel pressure in the loop. Just because the fuel pump is running doesn't mean it's giving enough pressure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 11 2006, 01:01 AM
Post #12


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
Well I swapped in another ecu (same part #) and it's still suffering the same problem. So check that possibility off of the list. So first thing after class tomorrow I'm swapping out the fuel pump to see if that makes any difference.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rick L
post Oct 11 2006, 10:09 AM
Post #13


Member
**

Group: Members
Posts: 405
Joined: 12-November 05
From: Columbia-ish, MD
Member No.: 5,116
Region Association: North East States
Had this problem after changing an alternator once. Like you I'm a smart one...I forgot to plug the air controler harness back in. It did exactly the same thing. I'd check there.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
john rogers
post Oct 11 2006, 10:51 AM
Post #14


Senior Member
***

Group: Members
Posts: 1,525
Joined: 4-March 03
From: Chula Vista CA
Member No.: 391
Check the fuel pressure with a gauge, just swapping the pump may not help if the lines are plugged or kinked or???
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 11 2006, 10:55 AM
Post #15


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
QUOTE(john rogers @ Oct 11 2006, 09:51 AM) *

Check the fuel pressure with a gauge, just swapping the pump may not help if the lines are plugged or kinked or???


Shouldn't have any plugged or kinked lines. The car was running fine until I replaced the AAR and arced the fuse. Ran fine with the old AAR out before I put in the new one as well. I think my problem is that I knocked something loose and am just over looking it or I fried something electronically.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
cooltimes
post Oct 11 2006, 10:58 AM
Post #16


Advanced Member
****

Group: Members
Posts: 2,508
Joined: 18-May 04
Member No.: 2,081
Region Association: None
Like 2 others have already said. Check the fuel pressure with a gage. The fuel filter been replaced lately? Check it?
MikeCool
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
swl
post Oct 11 2006, 05:16 PM
Post #17


Senior Member
***

Group: Members
Posts: 1,409
Joined: 7-August 05
From: Kingston,On,Canada
Member No.: 4,550
Region Association: Canada
just thinking out loud John.

You always get a brief run but it dies out almost immediately right? That means you are getting fuel delivery of some sort. Where would it come from? Assuming that it is not really cold there it won't be from the cold start valve - that doesn't kick in until it is almost freezing iirc.

You get a blast on all four injectors when you key on. I'm thinking that that is where you are getting that start gas from. The other possible source is from the tps. It gives a series of enrichment jolts as you go from off throttle to full throttle. I don't know if this hits all four injectors or just the two turned on by the the trigger points but I think it goes to all 4. Just for giggles why don't you see if you can keep it sort of running by kicking the throttle a few times.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RockinOldSchool
post Oct 11 2006, 06:04 PM
Post #18


914 Junkie
**

Group: Members
Posts: 203
Joined: 2-August 06
From: Whatcom County, WA
Member No.: 6,562
Region Association: Pacific Northwest
QUOTE(swl @ Oct 11 2006, 04:16 PM) *

Just for giggles why don't you see if you can keep it sort of running by kicking the throttle a few times.


Tried and it still died.

Been attempting to start it each time I try something new. Won't even start now. Cranks, but won't start.

So far:
Replaced the fuel filter
tried another ecu
tried another fuel pump
tried another relay board

Can't measure fuel pressure because I don't have a pressure gauge and don't have the money to buy one right now. (IMG:style_emoticons/default/dry.gif)

I've just about run out of ideas as to what the cause could be. (IMG:style_emoticons/default/confused24.gif)

Not to mention if I don't make it up to Bellingham tomorrow or friday afternoon i'm in big trouble with the girlfriend. (IMG:style_emoticons/default/sad.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
swl
post Oct 11 2006, 07:55 PM
Post #19


Senior Member
***

Group: Members
Posts: 1,409
Joined: 7-August 05
From: Kingston,On,Canada
Member No.: 4,550
Region Association: Canada
damn - can't have you in trouble with the girlfriend!

Have you done the 'squirt in a bottle'. remove the feed to the coil, pull an injector aim it into a bottle and crank the engine. You should see a really solid spray from the injector.

perhaps even before that. Key on, operate the throttle and listen for the injectors to fire. If you don't hear anything then the problem is definitely electrical not fuel.

How's the battery holding up through all this?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
effutuo101
post Oct 11 2006, 08:43 PM
Post #20


Advanced Member
****

Group: Members
Posts: 2,734
Joined: 10-April 05
From: Lemon Grove
Member No.: 3,914
Region Association: Southern California
Hey John,
Also check the battery cut off switch, they are known to go bad, although I have never heard of a case where you can get the motor to run for a few seconds and then cut out. What is the coil temp like? If I think of anything, I will drop you a line
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
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: 20th May 2024 - 06:45 PM
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 ...