Notices
924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
Sponsored by:
Sponsored by:

Runs for a second, then dies.

Thread Tools
 
Search this Thread
 
Old 04-23-2003, 07:48 PM
  #1  
mrmunky
Pro
Thread Starter
 
mrmunky's Avatar
 
Join Date: May 2002
Location: Chicago-ish
Posts: 739
Likes: 0
Received 0 Likes on 0 Posts
Post Runs for a second, then dies.

Hi All-
I've just got the timing finally done on my 944, what should've been the last step in an epic journey to get her running. However, she's doing something weird.. She'll start, but unless I give it some gas, the engine dies after about a second. I'm headed back out to the shop to check the fuses, give the DME relay a good shake, and clean the AFM connections.

I realize those probably aren't the problem, so what else could it be? I suspect the fuel filter (it's been sitting for awhile, crud in the tank may have settled and clogged it?), and if I can't fix it right quick, the filter is getting done as it probably needs to be done anyways.

Anyways, I'd really appreciate any suggestions or advice.

Thanks
Ian
Old 04-23-2003, 10:10 PM
  #2  
dualblade
Burning Brakes
 
dualblade's Avatar
 
Join Date: Apr 2002
Location: Long Island, NY
Posts: 1,049
Likes: 0
Received 0 Likes on 0 Posts
Post

how are the vaccuum hoses? i know vaccuum leaks can give idle probs so maybe that's a place to look. i'd wait for someone smarter than me to respond before you go through the trouble of checking them tho
Old 04-23-2003, 10:29 PM
  #3  
afx
Racer
 
afx's Avatar
 
Join Date: Sep 2002
Location: Austin, Texas
Posts: 370
Likes: 0
Received 0 Likes on 0 Posts
Post

I would say either vacuum lines or afm. After my rebuild my car had the same problem of not staying running and it was because of a broken vacuum line. A non-functioning AFM would sorta fo the smae thing.
Old 04-23-2003, 10:32 PM
  #4  
iloveporsches
Race Director
 
iloveporsches's Avatar
 
Join Date: May 2002
Posts: 13,634
Likes: 0
Received 1 Like on 1 Post
Post

A non-functioning (or unplugged <img border="0" alt="[ouch]" title="" src="graemlins/c.gif" /> ) AFM will make the car die out immediatly no matter what you do. Since giving it gas keeps it running, I don't think it'll be the AFM.
Old 04-23-2003, 10:32 PM
  #5  
Travis - sflraver
Site Sponsor
Lifetime Rennlist
Member
 
Travis - sflraver's Avatar
 
Join Date: Aug 2002
Location: A great big building in the woods, FL.
Posts: 6,527
Likes: 0
Received 4 Likes on 3 Posts
Post

That happened when I had a bad reference sensor in my 84... then again it also happened when I knocked the bottom part of my intake boot off of my 86.

Will it stay running if you give it gas? Thats what happened with the reference sensor.

The no vacuum problem would kick over once and then not go at all.
Old 04-23-2003, 10:57 PM
  #6  
mrmunky
Pro
Thread Starter
 
mrmunky's Avatar
 
Join Date: May 2002
Location: Chicago-ish
Posts: 739
Likes: 0
Received 0 Likes on 0 Posts
Post

well i went out there, and took a slightly more thorough look, i noticed that on the underside of the intake boot there was a tiny hose that i some how managed to not plug in.. 3 judo forehead slaps later, the car is running.. still needs a little tlc though.

thanks all
ian
Old 04-23-2003, 10:59 PM
  #7  
iloveporsches
Race Director
 
iloveporsches's Avatar
 
Join Date: May 2002
Posts: 13,634
Likes: 0
Received 1 Like on 1 Post
Post

Hey, at least it something simple!
Old 04-23-2003, 11:08 PM
  #8  
Travis - sflraver
Site Sponsor
Lifetime Rennlist
Member
 
Travis - sflraver's Avatar
 
Join Date: Aug 2002
Location: A great big building in the woods, FL.
Posts: 6,527
Likes: 0
Received 4 Likes on 3 Posts
Post

When I knocked the bottom part of my intake boot off it took me the good part of a day to figure it out... I went through all the steps also..

dme relay
out of gas?
checked for spark
AFM
then started going over all the vacuum lines and found it last.



Quick Reply: Runs for a second, then dies.



All times are GMT -3. The time now is 12:06 AM.