Carburetor 1983 Civic 1500

[caseys_wa]

Carb is a 3-bbl Keihin that was flooding gas to the point of gas getting into the oil. Removed carb and rebuilt. Installed, adjusted float levels...idles great. Test drove and finding the the engine is starving for gas over 25 mph. Rechecked float levels and adjusted auxiliary (primary fine). Noted the at idle the primary is spraying gas into the carb. When throttle is further engaged the primary jet produces stronger spray. At no time does the auxiliary jet sprays gas even at high rpm.

Am wondering if the lack of auxiliary jet supplying gas is the cause of the vehicle not getting enough gas when driven over 25 mph? At what point should the auxiliary jet do it's job?

Am I overlooking something else?

Thanks, Casey

[cvcc_wagon]

the aux jet should be working almost immediatly. it it supposed to feed a rich mixture to the cvcc chamber at all rpm in order to porduce a more complete burn. with the cvcc (aux jet) port not getting any feul combustion will not happen properly as the spark plug is located above the primary combustion chamber in the cvcc chamber. here is a picture of what i am talking about. hope this helps some.

[caseys_wa]

The problem is with the carburetor. Something is preventing gas from exiting the aux jet. Maybe something is blocking the fuel in the jet or I forgot to hook something up. What further baffles me is that I can adjust the fuel level in the float chamber. If I can do this then where is the fuel going during the adjustment period?

Thanks for your thoughts...Casey

[caseys_wa]

A side note since I just looked closer at photographs that I took while rebuilding the carb. The primary float/chamber supplies the fuel to the two large barrels of the carb (the auxiliary to the very small third barrel). Of the two larger barrels only one is supplying gas thru the jet and the other is not. I suspect there is a blockage and will need to remove and clear out. Interested in your thoughts before I do this again. Thanks

[grackletrap]

I have the same flooding carburetor problem--what level of difficulty is this rebuild? What was the main problem with the one you rebuilt?

[caseys_wa]

grackletrap...

The main problem I had was that the car was running really rough, had to man handle the gas pedal to keep the car from dying. Nursed it to my mechanic who looked at it and reported back the that carb was dumping a ton of gas to the point where the gas was actually getting into the oil. Said the cost would be just over $900 to repair.

Didn't have the heart to put that much into it. Paid him my $85 bill and got it home (we lived very close).

Bought a rebuild kit for $55. Pulled the carb taking a bunch of digital photos of the process so I remembered how to put it all back together. Noticed gas flooding the intake manifold and had to mop it out with papertowels.

Drained the oil that smelled heavy of gasoline. No doubt gas got in there. Pulled the spark plugs...two were dry and two were gas soaked. Replaced plugs, oil and filter.

Took carb apart, cleaned, and reassembled. Watch out for little parts inside. Air blowing blew on little plastic internal part into the yard into the grass somewhere. Looked for it for an hour, was about ready to give up and buy a new carb when the wife walked out and in 30 seconds found it. Am still doing dishes for her...

Reinstalled and started up fine. Still have to adjust the air/gas mixture and rpm. Need a tach that I dont have. Been driving daughter's new truck around but will get to the car in the next week or so...am in no hurry but really miss driving it...fun and great on gas, especially now.

If I can do it, you can. Can post pictures, just gotta figure out how. Let me know what I can do to help.

Casey

[grackletrap]

I had the same problem.

My friend's husband is the tech trainer for the local Honda plant, and his all-time favorite subject is---CARBURETORS! He got me the kit at cost and detailed instructions to do an on-car overhaul, which I did on Wednesday. It now runs, but needs some tweaking like yours.

[caseys_wa]

grackletrap...fantastic! I still have not fine tuned yet...but plan on tomorrow possibly. Not in a hurry anyway. Keep me posted and I will do the same.

Casey

[thepkilla]

I have an 82 Civic Hatchback, and I have the same problem that you guys do. (ie... fuel dumping into the throat) My float levels are always high, nowhere near the dots. Plus, at about 60 or above, the carb gets flooded if i go up a hill. I know the floats need to be adjusted and where the adjustor screws are. I just need to know how to adjust them. Another thing, where is the mix adjustment screw located? And which directon does what? Any help would be greatly appreciated!!!

[thepkilla]

I also have another problem. The engine idols unevenly. It idols up and down about 15 rpm's. I was wondering what could cause that problem.

[caseys_wa]

thepkilla...I took digital photos of my carb overhaul and need to figure how to post in the gallery...will look at that now. Should help ya...

Casey

[thepkilla]

Awsome.... thanx

[caseys_wa]

Not sure about the idle flucuation...I have not checked mine yet as have not gotten a tach to do so. Seems there is a little of that going on with mine too...

[caseys_wa]

I have the 1983 service manual with me here at the computer...maybe the automatic choke?

[thepkilla]

Yea, i thought that it might be something to do with a vacuum hose mixed up. But I double checked everything using the vacuum diagram on the inside of the hood. In the morning, i have to hold the accelerator so it doesnt die. After it gets warmed up its ok. Still does the idol thing though. My number 4 spark plug is always caked with fuel. But none of the other plugs are that way.