 Any suggestions?, Vapor lock? Or? |
|
|
|
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. |
|
|
  |
| Ebradley |
 Nov 28 2025, 10:56 AM
Post
#1
|
|
Member  Group: Members Posts: 59 Joined: 16-April 20 From: California Member No.: 24,142 Region Association: Southern California  |
I have a 74(2.0) that has issues when it’s hot outside. I’ll drive it and then it won’t start or stalls when stopped. It tries to start crescendo like ramping up faster and faster and when it does I have to keep the RPMs going or it will die. I’ve never had a problem when the weather is not hot. Until today. I drove it this morning and it’s cold outside, and I’ve encountered the same issue. Any ideas? Vapor lock? Not even sure. Thanks. |
   |
 
|
| chmillman |
Nov 28 2025, 11:42 AM
Post
#2
|
|
Member Group: Members Posts: 231 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe 
|
QUOTE(Ebradley @ Nov 28 2025, 05:56 PM)  I have a 74(2.0) that has issues when it’s hot outside. I’ll drive it and then it won’t start or stalls when stopped. It tries to start crescendo like ramping up faster and faster and when it does I have to keep the RPMs going or it will die. I’ve never had a problem when the weather is not hot. Until today. I drove it this morning and it’s cold outside, and I’ve encountered the same issue. Any ideas? Vapor lock? Not even sure. Thanks. Original D-Jet or onverted to carbs? |
|
|
|
| Ebradley |
Nov 28 2025, 11:53 AM
Post
#3
|
|
Member Group: Members Posts: 59 Joined: 16-April 20 From: California Member No.: 24,142 Region Association: Southern California |
All original d-jet. Car has little over a 100k miles
|
|
|
|
| FlacaProductions |
Nov 28 2025, 12:25 PM
Post
#4
|
|
Advanced Member Group: Members Posts: 2,097 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
|
collapsing/clogged fuel line or filter?
|
|
|
|
| JamesM |
Nov 28 2025, 01:12 PM
Post
#5
|
|
Advanced Member Group: Members Posts: 2,158 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
Need more information to properly diagnose but at this point I don't consider any 914 reliable until it has had the fuel pump relocated under the tank. I also update to the later style 2 port pump as they are available new and relatively cheap. They are easier to plumb and given their age I think all 3 port pumps are questionable. Other updates I make to the fuel system are to remove the plastic pre pump filter (VW started to do this in the mid 80s on Vanagons using the same pump to combat cavitation / pump starvation issues) and install a high pressure low micron post pump filter instead. Not saying that is for sure your problem (or only problem) but its a known issue that should be addressed if you want a reliable car. |
|
|
|
| wonkipop |
Nov 28 2025, 01:48 PM
Post
#6
|
|
914 Guru Group: Members Posts: 5,252 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
|
is it starting ok after being left over night?
and then being difficult after you have run it for a while? this can seem like a hot start v cold start scenario but not due to vapor lock. rather a blocked fuel line somewhere. either collapsed line or blocked filter. if so i'd check out what @JamesM is hinting at. if the fuel pump is in original location check the plastic cube fuel filter just before the fuel pump. under the car near the pump. could be clogged. good first port of call. agree with @JamesM about installing a full flow high pressure filter after the pump. check the eletrical connection to the pump. make sure its not corroded or loose. |
|
|
|
|
4 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
|
Lo-Fi Version | Time is now: 28th November 2025 - 01:57 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.