LUVTruck.com

phpBBV3 Message Board
It is currently Fri Jul 18, 2025 3:54 pm

All times are UTC - 6 hours




Post new topic Reply to topic  [ 12 posts ] 
Author Message
PostPosted: Mon Apr 17, 2006 2:41 am 
Offline
Junior Member

Joined: Sat Dec 10, 2005 3:00 pm
Posts: 9
I recently installed a weber on my new 79 4x4 and I had a few questions. First of all are you guys still using the fuel return? How about that vacuum port facing passenger side on the carb. Where does that go? Also it doesnt look like my electric choke is opening up with time. Another problem I have is the truck wont start without a shot of engine starter and once I do it starts right up :( Help! :(


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Apr 18, 2006 4:31 pm 
Offline
Addicted to LUV
User avatar

Joined: Sun Sep 21, 2003 5:10 pm
Posts: 1746
Location: Prineville, OR
As for the return line on mine I did have it hooked up. I had two nipples off of the carb so I used one for the return. the choke, you should have two wires that went to the original carb, one for the choke and one for the anti-dieseling solenoid, make sure you have the right wire to the right connector. Other than that maybe you need to adjust the choke itself, by loosening the screw(s)? and turning it a little CCW ( I think). The vac line, if no one responds in the meantime, I will see if I can find what I had them plumbed to or capped off...
as far as starting...?

_________________
Resident lurker


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Apr 18, 2006 7:06 pm 
Offline
LUVTruck.com Guru

Joined: Tue Jan 10, 2006 6:51 pm
Posts: 150
Location: Raeford, NC
I just plugged my return line off. The vacuum port on the passagener side is a timed vacuum. You have to tee off it an run one line to the egr valve. The other one goes to the vacuum port on the distrburtor.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Apr 20, 2006 1:24 am 
Offline
PITA Old Fart

Joined: Thu May 22, 2003 8:33 am
Posts: 2286
Be careful with the starting fluid...frequent use is not too good for your engine.

That stuff burns a lot hotter in your cylinders than regular gas.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Fri Apr 21, 2006 2:07 am 
Offline
Junior Member

Joined: Sat Dec 10, 2005 3:00 pm
Posts: 9
tumwatertaz wrote:
Be careful with the starting fluid...frequent use is not too good for your engine.

That stuff burns a lot hotter in your cylinders than regular gas.

hmm thanks for that. Also why does this thing smell like a lawn mower? the exhaust.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Fri Apr 21, 2006 2:10 pm 
Offline
Addicted to LUV
User avatar

Joined: Tue Jan 21, 2003 11:20 pm
Posts: 2825
Location: McMinnville, OR
If it smells funky then the mixture is probably off. Take a look at http://www.carburetion.com/Weber/adjust.htm and go through the adjustment procedure. It is really easy to do and should get you running better.

Somewhere I saw a how-to for choke adjustment, but I could not find it. It does sound like you need to adjust it, that should cure the hard starting. Basically, a lean choke will cause spitting sputtering on acceleration when the engine is cold. Too rich of a choke will cause a lopey stumbling idle when cold. If I recall correctly turning the choke housing CCW is leaner, clockwise is richer. To get a starting point, adjust it so the choke butterfly is closed when cold, but doesn't slam shut hard when you cycle it with your finger. It should just close.

_________________
95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good :lol:


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 2:50 am 
Offline
Junior Member

Joined: Sat Dec 10, 2005 3:00 pm
Posts: 9
Okay, I ran the vac line from the carb to the dist but didnt t off to the egr (I dont know where it is) and still doesnt start without starting fluid. I did folow the tuning link for the webber but no dice. I started up with the fluid and died shortly there after and wouldnt start again without fluid. Sounds like a fueling issue but I dunno. Suggestions? How important is it to have the EGR hooked up?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 8:16 am 
Offline
Step-side Guru
User avatar

Joined: Sun Apr 11, 2004 11:09 pm
Posts: 5272
Location: Salem OR.
check the float

_________________
My old but now gone Luv...
Image


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 2:16 pm 
Offline
Addicted to LUV
User avatar

Joined: Tue Jan 21, 2003 11:20 pm
Posts: 2825
Location: McMinnville, OR
The EGR only makes a difference under load at higher RPMs. It dumps some exhaust gas into the intake to cool down cylinder temps, which reduces pinging and NO2 emissions. It is located on the bottom side of the intake, and the line should go from it to a thermal switching deal screwed into the intake manifold up higher, then out of that to the vac source. It should also not be hooked in with the distributor. The EGR should get manifold vacuum and the distributor should be hooked to a ported vac source on the carb. Until you get things running right, I'd just leave it unhooked.

The starting issue to me sounds more like the choke than anything else. Does it make any difference in starting if the motor is fully warmed up? My best guess is that the choke isn't closing enough when its cold, so it should start pretty well when its already warmed up.

_________________
95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good :lol:


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 3:27 pm 
Offline
LUVTruck.com Guru

Joined: Tue Jan 10, 2006 6:51 pm
Posts: 150
Location: Raeford, NC
According to my series 8 book for a 1978 chevy luv. The EGR valve vacuum diaphragm chamber is connected to a timed signal port in the carburetor flange through a thermal vacuum valve.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 3:36 pm 
Offline
LUVTruck.com Guru

Joined: Tue Jan 10, 2006 6:51 pm
Posts: 150
Location: Raeford, NC
The EGR valve has a timed port control and a temp control for it . The EGR valve won"t open until the rmps are high enough and the engine is at normal temp.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue May 02, 2006 3:37 pm 
Offline
LUVTruck.com Guru

Joined: Tue Jan 10, 2006 6:51 pm
Posts: 150
Location: Raeford, NC
If it was open at idle it would run rough.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 19 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group