At wits end with Weber - JeepForum.com
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post #1 of 80 Old 03-03-2010, 01:43 PM Thread Starter
CTJeepin
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At wits end with Weber

Guys, like it says, I'm at my absolute wits end with this Weber 34. It's got about 100 miles on it and I'm ready to toss it in the garbage. I'm also willing to accept that there may be some user-error involved as well.

It's always run rich since the first day I put it on and tuned it. I brought it to a mechanic friend last week to see if he could do something that I wasn't able to. He made some minor adjustments but couldn't come up with anything that made any improvement. He told me that Webers tend to run rich because of the stock jets that they use. Mine was shipped with a .150 primary run jet and a .147 secondary. My idle jets were 65 primary and 47.5 secondary. He recommended that I go with a 145/147 run jet combination and a 35/35 idle jet combo. I ordered everything from Weber and installed the jets today. The horribly gassy exhaust fumes are gone but now I can't get the thing to idle under 2000 rpm's no matter what I do. The choke isn't sticking either. I don't have a clue what to do with this thing. Does anyone have any advice? Thanks.

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post #2 of 80 Old 03-03-2010, 02:47 PM
PrinothPro
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do you have fuel pressure regulator hooked up? Webers tend to run rich without FPR, I know i did with my 32/36.

You should chat with mcmud. He is genius with Weber and help me tons.
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post #3 of 80 Old 03-03-2010, 02:48 PM
vector6
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did you try this.. ?

Weber Carb Tunibg
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post #4 of 80 Old 03-03-2010, 05:43 PM Thread Starter
CTJeepin
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Quote:
Originally Posted by vector6 View Post
did you try this.. ?

Weber Carb Tunibg

Yes, that's exactly the article that I followed. Also, I have a Holley FPR set at 3psi. I wonder if re-jetting did more harm than good. Should I go back to stock and live with it?
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post #5 of 80 Old 03-03-2010, 07:49 PM
RedneckJacob
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you could send that weber 34 my way CTJeepin.....
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post #6 of 80 Old 03-03-2010, 08:32 PM
PrinothPro
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I know it is quite a distance for you but can't hurt to check the Hobbs Carburetor shop. I recently took my weber there in NH and they completely cleaned up my weber up, did whole 9 yards with it and cost me less than 100 bucks. Bolt on and go, they are amazing so you could check it out. You can try google to see if there is any place nearby. Good luck with your weber.
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post #7 of 80 Old 03-03-2010, 08:38 PM
windsoreight
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I feel for you, I went through the same with my 34. I ended it replacing it with a Holley 350. The difference is amazing. I would suggest take your loss and pick up a motorcraft. I was able to sell my weber to pay for my holley.

1999 XJ 2 door, 4.0 HO, Auto trans, Rough Country 4.5" lift, Ion wheels, 33/12.50/15 BFGtires, Getting it ready for paint.
1987 Wrangler, 4.2L, Holley 350cfm carb, TF999 Auto trans, NP207 transfer case, Rough Country 4" lift, Mickey Thompson limited edition wheels, BFG 33/12.50/15 tires.
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post #8 of 80 Old 03-03-2010, 08:40 PM
Fernando
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I am sure it just needs adjusting, if it helps at all I have two 145 jets. Don't know about the air jets but I could check what I have if removing them will not mess my carb up. I have a 32/36 though


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post #9 of 80 Old 03-03-2010, 09:09 PM
rexryman
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get the holly fuel pressure regulater.
i have the webber 34 and i had trouble for a while until i got the fpr.
and now it works great

the holly fuel pressure regulater costed about 30 dollars and then it cost about 10 dollars of fittings to put it in

now i idle at about 975-1000 and it dosent shake either it runns pretty smooth
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post #10 of 80 Old 03-03-2010, 09:11 PM Thread Starter
CTJeepin
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Quote:
Originally Posted by rexryman View Post
get the holly fuel pressure regulater.
i have the webber 34 and i had trouble for a while until i got the fpr.
and now it works great

the holly fuel pressure regulater costed about 30 dollars and then it cost about 10 dollars of fittings to put it in
I have that installed already and set at 3psi. I don't know what the problem is...
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post #11 of 80 Old 03-03-2010, 09:16 PM
windsoreight
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There is a difference between the Weber 32/36 and the 34. THe 34 is not a true Weber. It is an Empi sold under the weber name. I found this out when I talked the weber. The 34 in my opinion is over complicated junk. My jeep ran ok, it never ran rich or lean but had no power. I get better mileage and power from the holley. I spent enough time with mine to realize you were only able to get so much out of it. It is an ok carb but don't expect too much.

1999 XJ 2 door, 4.0 HO, Auto trans, Rough Country 4.5" lift, Ion wheels, 33/12.50/15 BFGtires, Getting it ready for paint.
1987 Wrangler, 4.2L, Holley 350cfm carb, TF999 Auto trans, NP207 transfer case, Rough Country 4" lift, Mickey Thompson limited edition wheels, BFG 33/12.50/15 tires.
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post #12 of 80 Old 03-03-2010, 09:18 PM
rexryman
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did you do the jerry rig throttle return!!!!

i will take a pic of mine in like two mins
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post #13 of 80 Old 03-03-2010, 09:20 PM
PrinothPro
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Oh I forgot to mention, I researched on weber so much I found that sometime weber does better with pinched fuel return line or smaller line. Something like that. I can try find the info for you?
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post #14 of 80 Old 03-03-2010, 09:20 PM Thread Starter
CTJeepin
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Quote:
Originally Posted by rexryman View Post
did you do the jerry rig throttle return!!!!

i will take a pic of mine in like two mins

Ya, I had to because the stock return spring wasn't strong enough to pull it back. I fab'd up a bracket and connected a heavier spring to it.
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post #15 of 80 Old 03-03-2010, 09:26 PM
rexryman
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does it pull the throttle all the way back it took me two trys to make the bracket pull the throttle all the way back, and it made me idle at about 1700rpm
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