Hey guys, 1980 20R, replaced the Aisin with a Weber 32/36 Red line, ive had to leave the truck idling at 1000-1100rpm's otherwise when im driving and come to a complete stop she just stalls out on me, cluth in or in neutral, i cant have her around 800-900 rpm, has to be 1000 + ... I was thinking vacuum leak, but I cant find any...any suggestions? Thanks!

 

This is the same problem I am having with my Aisin. I have even went around with a can of flammable carb cleaner trying to find it and I cant. Does yours idle fine sometimes and then go back to idleing like crap. That is what mine has been doing since the carb rebuild so i am wondering if maybe its fuel filter and crap in the tank. Ill keep you updated.

 

Well when i had the original Aisin on there it idled erratically, then I put the brand new Weber on and it ran amazing, BUT only if I keep the neutral idle at 1000-1100 rpm ... if i put it at 600-900 low idle it will drive but when i try to stop at stop signs etc it just stalls out... its fine at 1100 but its loud, gets kinda hot and is annoying...im thinking vaccum leak like i said maybe intake manifold has a crack or a leak, or its out of time... im not too sure at this point gotta tinker around a bit more

 

Try going around the intake with flammable carb cleaner using the spray tube. If you have a vacuum leak there it will pull the cleaner in and you will hear the engine rev up. Check your timing, distributer cap and roto buttun as well could be one of those throwin timeing off.

 

have you tuned the air/fuel mixture screw correctly?

 

Can you go into a bit of detail on that Xtreme? Im not good with carbs either so you may be helping the both of us.

 

FOR THE WEBER
http://www.carburetion.com/weber/adjust.htm

FOR THE AISIN
http://www.bluebassdesign.com/boonin/carb_faq/

follow it to the tee, any deviation will result in an improper mix.

Make sure you ignition timing is correct first though. for the 22r it will be 0 degrees with the vac tube(s) to the dizzy plugged and disconnected, not sure what it is for the 20r though.

 

Would this also apply for the Aisin Carb? Mine will idle great on some days and on others it wont idle at all. When it does idle it idles perfect at 800 to 850. So i am not sure where to look.

 

edited links added both for weber and for aisin

 

almost sounds like a choke issue to me.

 

That is what i was kinda leaning to. It has the electronic choke on it. Do these go bad, or does it just need adjustment? Thank you for the links they are an excellent read.

 

it's hard to tell with the choke, there is no real replacement for them at least not for less than $80, believe me I looked. I got tired of messing with my choke on my aisin, so when I rebuilt my motor I just put a brand new weber on it. no issues since then, although it likes to rev up at first start when choke is engaged, have to blip the throttle to get it to come back down some.

 

Thats the fast idle cam kicking in while its cold correct? Aint that what they are supposed to do till warm or untill the throttle is applied? So I take it you like your weber? Which model did you pick up? I am debating on doing the same if I cant get this issue resolved and just keeping the two Aisins as spares. I heard those webers allow you to clean up alot of the vacuum lines. Is that true or do you still have those everywhere? If it does allow it, do you just plug them or reroute them?

 

nah, ive left the truck running for over 20minutes, it still has to be at 1000+ rpm to not stall at complete stops and such...I love the weber, it simplifies everything, lots of vaccum lines are discarded, and you just plug them, I bought a Weber 32/36 Red Line Carb + kit on ebay.... seemed to have better throttle response too...

 

If you dont mind me asking what did that run you? Is that a manual choke on the weber is that why there are less problems? Check that link xtreme added. It has a step by step on how to set that carb up. It wouldnt hurt to just go back and check. But then i would try the carb cleaner or can of ether if you got it to find the leaks.

 

Hmm, no I didnt tune it properly then, I was only familiar with edelbrock carbs at the time, I assumed it was good out the box, after installation i just cranked up the idle speed screw and that was that, looks like ive got some tuning to do. =)

 

Mine is also a 32/36 but from webercarbsdirect. When I say it reves up with the choke engaged it revs to almost 5,000 when first started after I blip the throttle it will come down to where I have the fast idle set to, (about 2200 RPM) supposed to be around 3,000 but I don't like how it feels at that rpm when warming up.

Just because it will idle for 20 minutes doesn't mean the idle mixture is correct. I have seen too many people buy these carbs to put on, and just slap them on and go. Not do 1 stitch of tuning, nor put a fuel regulator on etc etc, and then down the weber saying how much worse they are than the aisin units. whether it be idle issues, drivability issues etc etc.

I've only had one minor issue with this thing on my last off-road trip with idling funny and that was because I had bumped my timing up to about 5 BTDC. Backing it back down to 0 solved it.

I have my fuel pressure set at 3.5-4psi for normal driving and drop that down to 1.5psi when I do off-roading with it. THe only regulator I will ever use is the holley regulators. Too many issues with the cheap dial type from mr. gasket/spectre etc etc.

80Yoda63B I am not too too familiar with the 20r, but which port do you have the vac line to the dizzy on both sizes carb and dizzy?

 

no mine is electric choke as well.

if I am not mistaken 80Yoda63B might be a water choke but not sure which motor/models/years had them.

somewhere on here I started a thread on my weber install (have yet to finish it) but it has an image of the invoice of what I paid for the carb and stuff.

 

I guess 300 to 400 dollars to make it idle properly wouldnt be bad. I am gonna try to adjust the choke and if that doesnt work i will probably pick a weber up and keep my other two Aisins for backup. Especially since replacing just the choke will cost me 80 bucks. So i will need a fuel pressure regulator and what else for the weber. Should I invest in a fuel pressure regulator for my Aisins.

 

no regulator needed for the aisins. does the issue happen with both your aisins? if so I doubt you have two bad chokes. I also picked up up the idle shutoff solenoid for the weber as well. although there has been arguments in the past if it needs it or not to stop the diesel down effect.

I found the copy of the invoice: