Author Topic: Weber Rough Idle (Read 36442 times)

BikerTrash · « **on:** Apr 03, 2007, 12:08:02 PM »

I just swapped a weber 32/36 onym my 84 4runenr and now my idle is pretty eratic. I sprayed smoe carb cleaner to check for leaks and it is looking like the basegasket for the carb is leaking.

In the instructions it said not to use RTV or silicon to seal it, to use gasket selant or grease. Not having anyother selants besides RTV I used grease. What else can I try to seal it, and will I need new gaskets?

question 2: Now that I have the weber what Pollution crap can I get rid of? I pretty much have everyting capped off right now, just running a vacuum hose with a y in it to my two vacouma advance ports on my distributor, and the line to the brake booster. everythign else si still there just no where to run it to, plugged all open ends.

third and last question, when i sat down to white this I only had one, jst keep rembering things to ask. There is only one fitting on the bottom of the aircleaner for the crank case breather. where do i run the PCV valve to?

79coyotefrg · « **Reply #1 on:** Apr 03, 2007, 12:31:30 PM »

1 check that the base bolts are nice and snug, and that adapter bolts are tight,

i used RTV on mine

2 pretty much all of it

3 when you toss the egr valve crap it leaves a port for your pcv to attach to if you have the egr blockoff with the hose connector

79coyotefrg · « **Reply #2 on:** Apr 03, 2007, 12:33:21 PM »

turn the mixture screw

the one at the base , all the way in, then back it out 2 turns and see what that does

BikerTrash · « **Reply #3 on:** Apr 03, 2007, 12:37:47 PM »

Thanks for the quick reply glen, going to go get on that now.

Gittinit · « **Reply #4 on:** Apr 03, 2007, 04:57:17 PM »

Quote from: 79coyotefrg on Apr 03, 2007, 12:31:30 PM

1 check that the base bolts are nice and snug, and that adapter bolts are tight, i used RTV on mine

2 pretty much all of it

3 when you toss the egr valve crap it leaves a port for your pcv to attach to if you have the egr blockoff with the hose connector

RTV on a carb gasket? Are ya crazy... don't the fuel eat the rvt and cause vaccum leaks?

Hilux92 · « **Reply #5 on:** Apr 04, 2007, 09:39:33 PM »

Check the idling jets. There are two, one on each side. RTV is a no no for carb jets.

Cheesemaker · « **Reply #6 on:** Apr 04, 2007, 11:00:31 PM »

Is this a new carb or a used one? If used, I'd get a new base gasket!

mudmaster · « **Reply #7 on:** Apr 05, 2007, 05:58:34 AM »

Quote from: gittinit on Apr 03, 2007, 04:57:17 PM

RTV on a carb gasket? Are ya crazy... don't the fuel eat the rvt and cause vaccum leaks?

I also did this on both of mine. One has been running around for 3+ years.

BikerTrash · « **Reply #8 on:** Apr 05, 2007, 05:25:25 PM »

Quote from: Hilux92 on Apr 04, 2007, 09:39:33 PM

Check the idling jets. There are two, one on each side. RTV is a no no for carb jets.

There are two idle screws on a 32/36? I thought that was only on a 38 but I will check when when i get back home on the 11th.

Quote from: cheesemaker on Apr 04, 2007, 11:00:31 PM

Is this a new carb or a used one? If used, I'd get a new base gasket!

Brand new carb, not sure if the grease I used to seal the carb would keep anything else I used from working so while I was ordering my EGR block plates form LC engineering I went ahead and ordered all new gaskets. I only want to pull this apart one more time

I did a search on google and according to permatex, they make a product called Hi-tack gasket sealant that is what they recommend for carb gaskets. Anybody have any experience with this? I usually just use Ultra Gray for everything but didn't because the instructions said not to use any kind of RTV, may still end up using it based on y'alls feeback if no one can come up with something better but three years of use by mudmaster and who knows how long by glen seems like pretty good proof to me that it works.

In all honesty though, even with the vacuum leak the truck drives better than it did before. Before it was foot to the floor in 5th to do 70, now it will hold 70 just barely into the secondaries.

mudmaster · « **Reply #9 on:** Apr 06, 2007, 05:07:16 AM »

I used high temp RTV. I can't remember for sure but I think that's what my instructions said to use

Cheesemaker · « **Reply #10 on:** Apr 07, 2007, 11:08:11 AM »

There is only two settings you can mess with on the 32/36 weber carbs. The fuel mix and the idle setting! It took many years to get mine dialed in 100%. The one thing about the webers is they can be stubborn. I had to adjust mine in the spring and in the fall! The difference in the weather affected it! But once I got it dialed in it was good! Another thing is to use lock tight on the setting screws. Mine would back out of adjustment due to vibrations! And I had to keep spare springs for the throttle return spring! Excellent power response and fuel economy over the factory carb I had on my nissan! I got up to 19-25 mpg. And I loved hitting the secondaries!

Why don't ya get a new base gasket for it! Like I said earlier, mine was really thick, and I just cinched it down tight! Never had any leaks! Go to weber's website, there is alot of tech pages on them!

*edit* Just thought about this after I posted!
http://www.redlineweber.com/html/Tech/carburetor_set_up_and_lean_best_.htm
This might help! If I was to low on idle I got a rough idle!

brainlessfool · « **Reply #11 on:** Apr 07, 2007, 06:29:59 PM »

Quote from: Hilux92 on Apr 04, 2007, 09:39:33 PM

RTV is a no no for carb jets.

Well spank my

and call me sally

I've used RTV on my weber base too. just a VERY thin flim.

BikerTrash · « **Reply #12 on:** Apr 11, 2007, 09:28:35 PM »

Success!!!

Just got in from work at about16:00, rested till about 18:00 and then removed and reinstalled all the addaptors for the carb. I am pretty sure I figured out what my problem was, the studs that go into the adaptor under the carburetor, one of them was threaded in so that about 1/16" or so
had broken the plain of the bottom and wouldn't let it seat against the gasket right.

New gaskets installed, EGR block off plates installed and it is running like a champ. when I test drove it it would want to rev up between gears, got home and the throttle is sticking as a temporary fix I wound the throttle return spring one wrap tighter but the throttle is heavy as hell now. I am not joking when I say the throttle feels like it is heavier than the clutch.

Thanks for the suggestions again everybody, I really apreciat it.

Cheesemaker · « **Reply #13 on:** Apr 11, 2007, 10:17:03 PM »

Loosen the nut on the throttle linkage a touch. Mine was that way! I think mine had a bend tab to help lock it in place! Try that! I always carried extra springs too! Knew it had to be simple!

Hilux92 · « **Reply #14 on:** Apr 11, 2007, 10:36:55 PM »

Can anyone tell me what size primary/ secondary air and main jet sizes you are using?

BikerTrash · « **Reply #15 on:** Apr 11, 2007, 10:54:22 PM »

Quote from: cheesemaker on Apr 11, 2007, 10:17:03 PM

Loosen the nut on the throttle linkage a touch. Mine was that way! I think mine had a bend tab to help lock it in place! Try that! I always carried extra springs too! Knew it had to be simple!

thanks, will do that, I ember snuggin that nut up pretty well, might have over did it.

Quote from: Hilux92 on Apr 11, 2007, 10:36:55 PM

Can anyone tell me what size primary/ secondary air and main jet sizes you are using?

Cant tell you for sure... I am just running what ever it is they sent in it stock.

twistedtoy92 · « **Reply #16 on:** Apr 24, 2007, 05:17:56 PM »

Quote from: cheesemaker on Apr 07, 2007, 11:08:11 AM

There is only two settings you can mess with on the 32/36 weber carbs. The fuel mix and the idle setting! It took many years to get mine dialed in 100%. The one thing about the webers is they can be stubborn. I had to adjust mine in the spring and in the fall! The difference in the weather affected it! But once I got it dialed in it was good! Another thing is to use lock tight on the setting screws. Mine would back out of adjustment due to vibrations! And I had to keep spare springs for the throttle return spring! Excellent power response and fuel economy over the factory carb I had on my nissan! I got up to 19-25 mpg. And I loved hitting the secondaries!

Why don't ya get a new base gasket for it! Like I said earlier, mine was really thick, and I just cinched it down tight! Never had any leaks! Go to weber's website, there is alot of tech pages on them!

*edit* Just thought about this after I posted!
http://www.redlineweber.com/html/Tech/carburetor_set_up_and_lean_best_.htm
This might help! If I was to low on idle I got a rough idle!

thanks for that site, i needed that to fine tune my dads 85!!!!

79coyotefrg · « **Reply #17 on:** Apr 24, 2007, 05:38:53 PM »

Quote from: Hilux92 on Apr 11, 2007, 10:36:55 PM

Can anyone tell me what size primary/ secondary air and main jet sizes you are using?

180/142 primary, 185/150 secondary

RN37DD · « **Reply #18 on:** May 11, 2007, 01:18:02 PM »

just pulled a redline weber off a 80 20r it was jetted 160/140 both w/stock air cleaner.
my 79 20r w/ old weber has 170/160p 180/165s with no choke and a K&n filter. probably rich but its a sea level norcal beach truck. I think i'll play with the jetting this week end and see how it likes it.

RN37DD · « **Reply #19 on:** May 13, 2007, 05:05:44 PM »

strange..I was wrong about the jetting on my truck... when I checkeced it today I had 170/150 p and 180/130s. Hmmm that didn't sound right so I changed it to 160/130p and 170/140.. idled great but was flat down low. changed it to 160/140 both... ran out of time, so I'll run it in to work in the morning and see what happens.

RN37DD · « **Reply #20 on:** May 15, 2007, 12:56:10 PM »

rpm dropped 200rpm.. good. runs smooth to 5000rpm then flattens out. no more run on when i turn the key off. going to run it awhile and see where the mpg turns out.

twistedtoy92 · « **Reply #21 on:** May 15, 2007, 03:42:53 PM »

how do you determine what size of jets you have??? i've been messin with my 32/36 weber and it will only run smooth with the primary jet 1/8-1/4 turn out!!! are the jets too big or small? and another thing, once you get the motor under load it starts to surge really bad and sounds like its running out of fuel... i adjusted the floats cuz they were rubbin on the bottom of the bowl, and put a k&n adapter/filter on her, new rubber fuel hoses, fuel filter, and different fuel pump......... can anybody give me ANY ideas on how to make this damn thing run smooth under load??? its so bad that you cant even hardly drive it down the road.................

09roramo · « **Reply #22 on:** Nov 04, 2010, 02:52:18 PM »

i have a weber also and i couldn't get it to idle smooth like yours. i only used the gaskets that were given and no silicone stuff. i finally realized the butterfly valves (i think that is what its called) weren't closing all the way and put a really stiff spring on the close lever. after that the engine ran smooth as butter and had real good power. just adding my experience with a weber.

79coyotefrg · « **Reply #23 on:** Nov 25, 2010, 11:58:48 AM »

Quote from: 09roramo on Nov 04, 2010, 02:52:18 PM

i have a weber also and i couldn't get it to idle smooth like yours. i only used the gaskets that were given and no silicone stuff. i finally realized the butterfly valves (i think that is what its called) weren't closing all the way and put a really stiff spring on the close lever. after that the engine ran smooth as butter and had real good power. just adding my experience with a weber.

I remember now. I had that problem with the throttle shaft being too tight so loosened it off a touch and put a second nut on it as a jamb nut and it was fixed.

santa cruz crawler · « **Reply #24 on:** Jan 15, 2011, 10:50:39 AM »

Well if it's working, than there's no need for propane
And if you jet it up , you might find some more power
Any way cyote is the isht w the Webbers if there's a prob
Let him no he gets right back to you, very helpfull
And I used gear oil to seal my gaskets and switched the vac advance to a 20 r advance, one hose to the carb and that's it , all smog stuff can be sold for bigger jets a d a spare fuel
Cut of plug!! Glad to hear it's working

lexustech16 · « **Reply #25 on:** Dec 25, 2012, 05:32:51 PM »

Just put the weber on my 81' actually impressed with the "power" gain. Have u noticed a fuel economy boost?

santa cruz crawler · « **Reply #26 on:** Jan 18, 2013, 01:59:08 PM »

I had to pull this thread out from the dead ,
I don't see a better mil/ gal but more torque and better power band
Im having problems with the ( surge ) loss of power up hill
Kinda like its starving for fuel , my altitude is -1800-2000 feet
I'm going to adjust the butterfly's
And play with the air/ fuel mixture ,
Any Ida's much appreciated

kneedownnate · « **Reply #27 on:** Jul 21, 2013, 12:26:38 PM »

Only decent mileage I have seen is when it was tuned to pass smog. Otherwise I get poor mileage.

crazymoritz97 · « **Reply #28 on:** Nov 17, 2013, 06:01:42 PM »

is their anyone in at chico, paradise, area that has a webber on a first gen with a 20r engine?

BikerTrash [OP]

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