anyone know how it works? i think i see how it works, but are there any tricks? solenoids? wierd air bleeds? my stock carb doesnt seem to want to meter fuel at low speed



mike

wtf, thought you had a -se?

i bought an 83 le a couple months ago, in addition to the se.



mike

When my 85 12a didn't like to idle/run at low engine speeds I ended up "rebuilding" (aka, take apart and clean with new gaskets) the carb. Looking back on it I probably should have tried some strong carb cleaner or something of the like before taking that ugly sob off and "rebuilding" it.

Time to ask Questions...



how low can the engine run before it cuts off?

this is an OK pic of the air bleeds.

sorry, that one sucked!

here's a better one. I think this air bleed is for the idle circuit.

85 Factory Service Manual

I found this just now. It might help????

yah, its wierd it will start with a couple of pumps of the gas but it wont run under 2500-3000 rpms. we've been through just about everything, ignition, vacuum leaks, compression test. it actually runs better if you pull the fuel line off the carb and let it go into the carb



mike

Mike has enough 7 projects to keep mazda mechanics bsuy for awhile. https://www.nopistons.com/forums/pub...#>/biggrin.png

The idle circuit meters fuel at low speeds only. when you raise the rpm, the main curcuit takes over.

This new, reformulated gas gums up very quickly. it sounds to me that you have some clogged

idle circuits. I had the same problem on my '82. Since the carb is now 20 years old, it would be a good

idea to clean it up. Take it completely apart and soak it in some Berryman Chem-dip. It's about

$13 but well worth it.

thats what I did ^



I remember marking every little piece to make sure where they all went but when I took the jets out I just threw them in the bucket. https://www.nopistons.com/forums/pub...IR#>/blush.png (I was 16 and didn't know that the primary and secondaries were different) So I put it all back together and it didn't run "just right" so I said **** it and took it down to a shop and they said "We can't figure out whats wrong with it, it's almost like the jets are mismatched" https://www.nopistons.com/forums/pub...DIR#>/ohmy.png doh. So I drove it home and swaped jets then she purred like a kitten https://www.nopistons.com/forums/pub...DIR#>/cool.png

yeah i think i'm either gonna pull the top off of carb #2 or rebuild the original



mike

Yup, I found gum in my secondary apply circuit. The one that applies vacuum to the

secondary diaphragm.



What I did was, make a diagram of the top of the carb where each air bleed is by number,

then disassembled, dumped out the rust and scale, put everything into the dip (minus the

electrical and rubber parts) for 1/2 hour then rinsed with water. Blow dry w/compressed

air. Then before assembly, I shoot carb cleaner through every port, hole, orifice, and air

bleed. BE CAREFUL!! Some of the holes will shoot back!!! PTUEY! https://www.nopistons.com/forums/pub...IR#>/blink.png

Then I reassemble. Check your float drop and rise against the manual with the gasket

installed.



Have Fun https://www.nopistons.com/forums/pub...#>/biggrin.png

BTW do carb #2 since it's already out and ready.

ok #2 carb it is https://www.nopistons.com/forums/pub...IR#>/bigok.gif



mike

Inspect everything as it comes apart, Take pictures if you have a digital camera and let us

know how it goes. https://www.nopistons.com/forums/pub...DIR#>/cool.png

I do a lot of digital photo taking before and as I pull **** apart. Makes reassembly soooo much easier. https://www.nopistons.com/forums/pub...IR#>/smile.png

oops, well you guys get pics of it going back together!



mike

Think its ready to run properly yet?



Luis

well i took the best parts of both carbs and made one, if i could get the floats to float like they did yesterday i think i'd be in buisness



mike

Cool.I hope to hear you have it running by monday night then.https://www.nopistons.com/forums/pub...#>/biggrin.png

haha, i'm smarter than a carburator!



mike

IS it running? https://www.nopistons.com/forums/pub..._DIR#>/dry.png

yes its not all there but much better



mike

do we have sick sex? Uh... I mean success??

cool!!

so it turns out that the air pump came apart and all the broken peices were stuck in the air control valve. in round 1 i got the air control part of the valve workong, but i missed the anti afterburn valve. i ended up have ing to make a gasket that blocks off the anti afterburn part of the air control valve becuase it was damaged. it runs good now (needs some fine tuning), and the air control part of the air control valve works so i should be able to pass smog too.



mike

IS it running? https://www.nopistons.com/forums/pub..._DIR#>/dry.png [/quote]

https://www.nopistons.com/forums/pub...IR#>/dunno.gif https://www.nopistons.com/forums/pub...DIR#>/ohmy.png

it runs good!



mike

Glad to hear it mike.Now we need Hereonouts 83 running. https://www.nopistons.com/forums/pub..._DIR#>/sad.png

yup, i vote for anti afterburn valve #1 its a bithc!



mike

Yeah we need to help that poor guy out.