 Intermittent Problem with Betty's car, I am at my wit's end on this one. |
|
|
|
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. |
|
|
| ClayPerrine |
 Dec 22 2014, 07:17 PM
Post
#1
|
|
Life's been good to me so far.....  Group: Admin Posts: 15,436 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
 |
About 2 weeks ago, Betty came home and said her 74, 1.8L Ljet 914 was intermittently cutting out. I took it out to test drive it, and sure enough, it will randomly cut out. Sometimes mildly, sometimes it feels like the engine shuts off completely, then turns back on.
So I started troubleshooting. Nope, grounds for the injectors are fine. Put the LM-1 in the tailpipe and had her drive it. Every time it cuts out, the LM-1 shows it going lean. I put an L-Jet tester I have on it and ran through all the tests and it shows as working fine. I had it running in the garage, and I went through a "wiggle test", wiggling every wire and connection on the engine. Nothing I do can replicate the issue in the garage. So I started throwing parts at it. To date I have replaced: The air flow meter. The fuel injection wiring harness. The double relay. The dropping resistors. The fuel pump. The ECU. The CHT. The whole distributor with a different pertronix, and tried points too. Nothing I have done to date helps. So I am hoping the collective knowledge of this place will help. I have checked all the simple stuff already. This is going to be hard to fix, whatever it is. I am now to the (IMG:style_emoticons/default/WTF.gif) stage, and looking for suggestions. |
   |
 
|
Posts in this topic
ClayPerrine Intermittent Problem with Betty's car Dec 22 2014, 07:17 PM
r_towle Ignition switch.
My 911 was doing this, good news... Dec 22 2014, 07:31 PM
eyesright
Ignition switch.
My 911 was doing this, good new... Dec 22 2014, 09:04 PM Tom_T Clay, that sounds like an intermittant bad connect... Dec 22 2014, 07:34 PM jim_hoyland I just had the exact same issue. Turned out to be ... Dec 22 2014, 08:08 PM ClayPerrine
I just had the exact same issue. Turned out to be... Dec 22 2014, 08:10 PM r_towle Wiggle the key.
I can make mine happen or not.
Mi... Dec 22 2014, 08:21 PM Jeff Bowlsby Maybe its fuel related? dirty tank sock? dirty f... Dec 22 2014, 08:51 PM SirAndy Maybe its fuel related? dirty tank sock? dirty f... Dec 22 2014, 09:40 PM ClayPerrine
Maybe its fuel related? dirty tank sock? dirty ... Dec 22 2014, 10:08 PM rick 918-S
[quote name='SirAndy' post='2125599' date='Dec 22... Dec 22 2014, 10:55 PM Spoke When it cuts out, does the tachometer continue to ... Dec 22 2014, 09:09 PM rick 918-S Relay board shorting as the board heats up? I had ... Dec 22 2014, 09:30 PM ClayPerrine
Relay board shorting as the board heats up? I had... Dec 22 2014, 10:10 PM PanelBilly Did you try cleaning the ends of the fuel pump fus... Dec 22 2014, 10:13 PM ClayPerrine
Did you try cleaning the ends of the fuel pump fu... Dec 22 2014, 10:15 PM dakotaewing Is this all on the same tank of gas? What grade fu... Dec 22 2014, 10:23 PM ClayPerrine
Is this all on the same tank of gas? What grade f... Dec 22 2014, 10:27 PM ThePaintedMan Seems like a pretty comprehensive list Clay. Did y... Dec 22 2014, 10:35 PM Mark Henry My first thought would also be a electrical issue ... Dec 23 2014, 12:13 AM brant Tps Dec 23 2014, 12:24 AM MJHanna Time to drag out the carbs :D Dec 23 2014, 05:16 AM ClayPerrine
My first thought would also be a electrical issue... Dec 23 2014, 05:57 AM RobW You changed the distributor, did you change the ca... Dec 23 2014, 07:22 AM ClayPerrine
You changed the distributor, did you change the c... Dec 23 2014, 12:04 PM partwerks I had an issue once with it cutting out, and rando... Dec 23 2014, 07:34 AM Drums66 .....I had symtoms similar to those with a few 1.8... Dec 23 2014, 12:23 PM ClayPerrine
.....I had symtoms similar to those with a few 1.... Dec 23 2014, 03:13 PM fignewton probably not your problem, but one time with a 240... Dec 23 2014, 12:55 PM 7TPorsh Hmmm....mine was a pinched hose under the tank. Dec 23 2014, 01:19 PM bulitt Clay- disconnect the fuel line at the tb and stick... Dec 26 2014, 06:36 PM jim_hoyland Did you try grounding terminal III from the rear o... Dec 27 2014, 07:56 AM 02loftsmoor I may have missed this in all the posts, isn't... Dec 27 2014, 01:50 PM ClayPerrine
Clay- disconnect the fuel line at the tb and stic... Dec 27 2014, 10:06 PM Jeff Bowlsby Rather than throwing parts at it, the only clue is... Dec 27 2014, 10:43 PM Philip W. This thread is like a mirror image of mine, only i... Dec 28 2014, 07:31 AM 76-914 Clay, I've read over this and have a question ... Dec 28 2014, 09:55 AM ClayPerrine Ok.. I have determined what is causing it.
It... Dec 28 2014, 06:04 PM mepstein Thanks dad. :trophy: Dec 28 2014, 06:37 PM ejm Since the problem is related to the charging syste... Dec 28 2014, 07:39 PM ClayPerrine
Since the problem is related to the charging syst... Dec 28 2014, 08:17 PM ThePaintedMan That's why I suggested looking into the chargi... Dec 28 2014, 10:37 PM r_towle What a saga, hope this is the cure. Dec 28 2014, 11:09 PM timothy_nd28 I'm late to the party here, glad it's work... Dec 28 2014, 11:39 PM Cap'n Krusty Both D-jet and L-jet require a minimum voltage, an... Dec 29 2014, 12:05 AM Cap'n Krusty Oh, it's around 11v, maybe 11.5, IIRC. Been a... Dec 29 2014, 12:06 AM Dave_Darling
Oh, it's around 11v, maybe 11.5, IIRC.
I kn... Dec 29 2014, 12:39 AM ClayPerrine
Oh, it's around 11v, maybe 11.5, IIRC. Been ... Dec 29 2014, 06:15 AM Dave_Darling I suspect it is a blown diode causing a reverse vo... Dec 29 2014, 03:26 PM ClayPerrine
I suspect it is a blown diode causing a reverse v... Dec 29 2014, 03:30 PM r_towle
[quote name='Dave_Darling' post='2127667' date='D... Dec 29 2014, 03:35 PM Dave_Darling
I also have a freshly rebuilt alternator that was... Dec 29 2014, 10:44 PM timothy_nd28 100% agree with you on the low voltage situation, ... Dec 29 2014, 12:16 AM Bartlett 914 Is the belt tight? Is the alternator well grounded... Dec 29 2014, 09:01 AM 57lincolnman
About 2 weeks ago, Betty came home and said her 7... Dec 29 2014, 08:37 PM 57lincolnman Sort of late to this discussion but I had a cut ou... Dec 29 2014, 08:40 PM malcolm2 Will we be seeing a FS post from you soon? You ha... Dec 29 2014, 10:38 PM ClayPerrine
Will we be seeing a FS post from you soon? You h... Dec 30 2014, 07:18 AM rick 918-S Relay board failing. Dec 29 2014, 10:48 PM rgalla9146 A little late and a bit off topic but.....
Disco... Dec 30 2014, 08:24 AM Spoke
A little late and a bit off topic but.....
Disc... Dec 30 2014, 08:39 AM ClayPerrine
A little late and a bit off topic but.....
Disc... Dec 30 2014, 03:22 PM Spoke
It will just run on the battery at that point.
... Dec 30 2014, 08:03 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 5th May 2024 - 06:33 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.