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 )

 
Reply to this topicStart new topic
> Intermittent rough running, Any ideas?
cal914
post Feb 17 2017, 06:52 AM
Post #1


Member
**

Group: Members
Posts: 221
Joined: 12-April 12
From: United Kingdom
Member No.: 14,366
Region Association: None



We have a 1970 1.7 running on dual carbs. It has recently developed an intermittent problem of rough running when it happens it feels it is running on just 2 cylinders, really rough with loss of power and fuel smell in the cab.

It happened the other morning when we drove it for about an hour and we then stopped for about an hour and it was fine when we re-started. Then the next week it came on and off for the first hour of the journey and then was fine. On Wednesday this week we took the 914 out on a good long run and it was fine both ways.

Any ideas where to start looking for this problem?

Thanks!

Kate & Brian

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BK911
post Feb 17 2017, 09:34 AM
Post #2


Member
**

Group: Members
Posts: 488
Joined: 19-February 04
From: Rocky Top, TN
Member No.: 1,674
Region Association: None



Spark plug wires.
Fuel filter
Fuel sock in tank
???
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Feb 17 2017, 03:41 PM
Post #3


914 Idiot
**********

Group: Members
Posts: 12,724
Joined: 9-January 03
From: Silly-con Valley, CA
Member No.: 121
Region Association: Northern California



Check compression.
Check for fuel.
Check for spark.
Check for air leaks.
Check the carb sync.
Check for debris in the carbs.
Check float adjustments and such.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
stugray
post Feb 17 2017, 04:10 PM
Post #4


Advanced Member
****

Group: Members
Posts: 3,736
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None



QUOTE(cal914 @ Feb 17 2017, 05:52 AM) *

We have a 1970 1.7 running on dual carbs. It has recently developed an intermittent problem of rough running when it happens it feels it is running on just 2 cylinders, really rough with loss of power and fuel smell in the cab.

It happened the other morning when we drove it for about an hour and we then stopped for about an hour and it was fine when we re-started. Then the next week it came on and off for the first hour of the journey and then was fine. On Wednesday this week we took the 914 out on a good long run and it was fine both ways.

Any ideas where to start looking for this problem?

Thanks!

Kate & Brian


Sounds to me like a stuck float or needle valve.
that would cause one side to flood and not fire on those two cylinders.

Pull out the dipstick and smell it. Do you smell gasoline?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 26th April 2017 - 05:44 AM