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 )

> Dual Carb Problem need help
Cazz
post Mar 17 2018, 12:38 PM
Post #1


Newbie
*

Group: Members
Posts: 13
Joined: 22-December 16
From: NC
Member No.: 20,688
Region Association: None



Any carb specialists out there? I need help with a carb problem.
-1974 2.0 with dual weber carbs
-The car is spitting and popping out the carb on cylinders 1&2and also backfiring alittle. I've rebuilt the carbs and pulled this carb off again completely taking it apart and checking with no obvious issues found
-With the car idling when I put my hand over each barrel on this carb there is no suction at all on my hand. The idle doesn't drop at all. Doesn't respond to any adjustments on the fuel/air mixture screws.
-The carb is injecting fuel streams when I open the linkage by hand
-On the carb on the opposite side when I put my hand over each velocity stack it really pulls air really hard on my hand and the car will bog down and shut off as it should.
-I have new intake gaskets an new carb base gaskets installed. I sprayed carb cleaner around the base of the carb and also at the head with no change in idle. Any ideas? Is this car basically running on 2 cylinders?
-On the opposite carb on cylinders
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
BfloRandy
post Mar 22 2018, 06:26 AM
Post #2


Dimwit Extraordinaire
**

Group: Members
Posts: 66
Joined: 20-September 14
From: Buffalo, NY
Member No.: 17,927
Region Association: North East States



QUOTE(Cazz @ Mar 17 2018, 02:38 PM) *

Any carb specialists out there? I need help with a carb problem.
-1974 2.0 with dual weber carbs
-The car is spitting and popping out the carb on cylinders 1&2and also backfiring alittle. I've rebuilt the carbs and pulled this carb off again completely taking it apart and checking with no obvious issues found
-With the car idling when I put my hand over each barrel on this carb there is no suction at all on my hand. The idle doesn't drop at all. Doesn't respond to any adjustments on the fuel/air mixture screws.
-The carb is injecting fuel streams when I open the linkage by hand
-On the carb on the opposite side when I put my hand over each velocity stack it really pulls air really hard on my hand and the car will bog down and shut off as it should.
-I have new intake gaskets an new carb base gaskets installed. I sprayed carb cleaner around the base of the carb and also at the head with no change in idle. Any ideas? Is this car basically running on 2 cylinders?
-On the opposite carb on cylinders


I had a very similar issue last spring. My car would idle just fine, with no popping or backfiring. It would pop and/or backfire when revved to 3k. Turned out the linkage drop bar on the one side was out of whack by about 1/4 - 1/2 inch (too long). I figured this out after doing a valve adjustment, replaced those same base gaskets, replaced plugs, wires, factory reset carbs, synced them, replaced fuel filter, checked everything under the sun. Every symptom you just mentioned was what I had. Can't hurt to check!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
Cazz   Dual Carb Problem need help   Mar 17 2018, 12:38 PM
MarkV   Sounds like they are way out of sync. Find a good ...   Mar 17 2018, 02:45 PM
porschetub   Sounds like they are way out of sync. Find a good...   Mar 17 2018, 03:03 PM
Perry Kiehl   Sounds like you may have ignition problems as well...   Mar 17 2018, 03:49 PM
jcambo7   Put you're carbs at the initial adjustment sta...   Mar 17 2018, 07:19 PM
98101   Cazz mentioned a lack of suction on one side. I se...   Mar 18 2018, 02:54 AM
jcambo7   Cazz mentioned a lack of suction on one side. I s...   Mar 18 2018, 08:41 PM
rhodyguy   Does the engine smooth out, or at least run better...   Mar 18 2018, 09:53 AM
Elliot Cannon   Does the engine smooth out, or at least run bette...   Mar 18 2018, 05:42 PM
wndsrfr   Any carb specialists out there? I need help with ...   Mar 18 2018, 02:15 PM
SirAndy   Valve adjustment if there's no vacuum.... :a...   Mar 20 2018, 08:48 PM
PatrickB   Any carb specialists out there? I need help with...   Mar 22 2018, 03:44 AM
r_towle   Check your firing order. You may have flipped the ...   Mar 18 2018, 06:51 PM
McMark   Get the CSP Bellcrank linkage from CIP1. This vid...   Mar 19 2018, 08:15 AM
Mblizzard   I suspect an issue related to the "rebuild. ...   Mar 19 2018, 12:07 PM
barefoot   I'm having sync problems as well Dell 40's...   Mar 20 2018, 06:27 PM
98101   I'm having sync problems as well Dell 40...   Mar 20 2018, 08:13 PM
98101   Sorry for a newbie question... this is how I learn...   Mar 20 2018, 08:41 PM
r_towle   Sorry for a newbie question... this is how I lear...   Mar 20 2018, 09:19 PM
98101   Sorry for a newbie question... this is how I lea...   Mar 21 2018, 12:47 AM
r_towle   Carbs are stupid simple. They allow air into the e...   Mar 20 2018, 09:21 PM
porschetub   Carbs are stupid simple. They allow air into the ...   Mar 22 2018, 12:00 AM
stugray   Carbs are stupid simple. They allow air into the...   Mar 22 2018, 01:07 PM
McMark   Also the suction in one cylinder is created by the...   Mar 21 2018, 10:23 AM
BfloRandy   Any carb specialists out there? I need help with ...   Mar 22 2018, 06:26 AM


Reply to this topicStart new topic
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 31st October 2024 - 05:40 PM