Where do I look for vacuum hose routing info '89 Accord LX

[senor honda]

Where do I look for vacuum hose routing info '89 Accord LX?

For off-road use only. I want to keep the vacuum operated secondary
on the carb, but for simplicity, and engine cleanliness, would like to eliminate
excess gazillion vacuum hoses.

Anything with explanations as to what they do?-Under hood drawing shows hose numbers but no explanation.

Can anyone point me to an article/diagram, etc. ?
Thanks in advance.-Bob

[snoopyloopy]

i would think underhood diagram would have it, but i guess you put in a v toe already on that. next thing i can think of and which will probably turn out to be better is the haynes repair manual. if you don't have one, you need one.

[Pico]

you can try the Accord Service Manual, here's the link
Manual

[A20A1]

https://www.3geez.com/forum/showthread.php?t=45880

btw: this is not a research and development thread, this is a technical thread or a carb tech thread and should be posted in those forums instead. I moved the thread.

[senor honda]

Thanks, guys. That is a start.-Bob

[senor honda]

Next question....

There is a black plastic box that has 3 vacuum hoses coming out the back side. It looks like a nut on the front side. The three hoses are labelled A, B, and C.

A goes to the carb front. B and C goes to the carb back...
All hoses have a restrictor in the metal pipe that connects to the carb.
Does anyone know where I can find what those hoses do?

and

How is the nut/adjuster(?) on the front, used to make the car run better?
...or make it run right?

Thanks in advance.-Bob

oh...and thanks for the info on getting a Haynes manual...I got one sometime back, but they don't tell how to adjust the vacuum controls.....neither does the Chilton manual.

[A20A1]

I assume one is for slow mix air correction one is for primary air correction and one is for secondary air correction

Since they all seem to connect to the Air Correction Jet passages.
To get a better idea look carefully at the underside of the top hat and trace where the internal passages go.

I think that diaphragm in there adjust to atmospheric pressure changes due to changes in altitude. The higher the altitude the less resistance on the diaphragm and the more open the air passages are which brings in more air to the air correction which then helps to lean the mixture.

[senor honda]

This is just a request for a non-binding, opinion....

For cleaning up the engine compartment...
What do you think would be the result if I plugged them off......... for off road use, of course...... Florida is at sea level anyway.....more things mean more things to go wrong....or leak.....

Ohhh....and which is the slow mix air correction and which is
primary and which is secondary? I will trace them anyway to educate myself a little... Your thoughts, please...-Bob
-------------------------------
Additional info....
Recently it started having trouble idling slowly. Aftermarket Vac ga shows vacuum declines below 2K rpms....hardly wants to run....have to keep pumping the accelerator.......so I have the idle screw set high to make it more driveable at least.......

Any suggested cures?-Bob

I assume one is for slow mix air correction one is for primary air correction and one is for secondary air correction

Since they all seem to connect to the Air Correction Jet passages.
To get a better idea look carefully at the underside of the top hat and trace where the internal passages go.

I think that diaphragm in there adjust to atmospheric pressure changes due to changes in altitude. The higher the altitude the less resistance on the diaphragm and the more open the air passages are which brings in more air to the air correction which then helps to lean the mixture.

[A20A1]

you'll run richer if you plug off ABC from the AJC (Air Jet Controller) on the carb.
I'm only sure that C is for the secondary Air Correction, till I can get my carb in front of me... From looking at my pictures though I would say that A is for Primary. and B for Slow mix... but then if it's not slow mix then I dunno... maybe idle or an Aux primary


If you're a nut like me and play around, hooking one of the ABC lines from the carb back to a carb venturi vacuum port under the fuel line you'll siphon gas from the Air Correction Jets.

[senor honda]

1.What does it do when a person siphons
gas from the Air Correction Jets?

and 2.... what does the slow mix port do?

3. Where is a carb venturi port located? Will it give me a better vacuum
and/or different vacuum reading than the manifold?....there is a larger manifiold vacuum hose on each side of the carb....that is where I am currently pulling vacuum from...
----------------------------------------------
I have driven for 2 days with the A/B/C hoses plugged on the carb.
It doesn't seem to affect anything, and I might leave them plugged.
and remove the air jet controller, for a cleaner engine compartment...
-----------------------------------------
It also idles better when I leave the vacuum advance disconnected
and both lines plugged.....the vac advance might have been running the idle up and down....I am now thinking about putting in a manual cable...maybe from a choke kit, to set the advance if I want good acceleration, or retard the timing for interstate usage and better gas mileage.....-Bob

Your thoughts on my questions? -Bob

you'll run richer if you plug off ABC from the AJC (Air Jet Controller) on the carb.
I'm only sure that C is for the secondary Air Correction, till I can get my carb in front of me... From looking at my pictures though I would say that A is for Primary. and B for Slow mix... but then if it's not slow mix then I dunno... maybe idle or an Aux primary

If you're a nut like me and play around, hooking one of the ABC lines from the carb back to a carb venturi vacuum port under the fuel line you'll siphon gas from the Air Correction Jets.

[A20A1]

Siphoning gas was a mistake on my part... it's pretty bad so you don't want to actually do it

Leave the AJC plugged. As for manual control of advance, I would just leave the vacuum connected, your timing may need adjustment though so get a timing light and check that and see where your at with the diaphragm plugged in and unplugged, rotate the distributor as needed.

[senor honda]

Siphoning gas was a mistake on my part... it's pretty bad so you don't want to actually do it

Leave the AJC plugged. As for manual control of advance, I would just leave the vacuum connected, your timing may need adjustment though so get a timing light and check that and see where your at with the diaphragm plugged in and unplugged, rotate the distributor as needed.

I have been trying to solve/figure out an intermittent problem.

I thought it was somehow related to vacuum....maybe the vacuum advance was moving???.....sometimes when I turn the key off, the engine diesels and
coughs, with slight smoke coming out of the air filter....sometimes it doesn't deisel and cough....
------------------------------------
I have since totally removed the vac advance and fastened a paper clip to the vac advance pin in the distributor, so it would not advance or retard.....at the full retard position, the car starts quicker/better... I thought eliminating the vac advance might stop it, but it still happens intermittently.......

If I turn the key off and floor the accelerator, it is less likely to deisel and cough.......that told me the problem was related to how much air or vacuum the carb was getting.

Your thoughts please? Thanks.-Bob

[jlebr549]

Closer look:













This is my old carburetor that I rebuilt...man look at the crud.

What I learned in the process:
Fuel is drawn through the slow idle circuit at idle, then as the throttle plate moves it will start to draw more fuel through the primary jet.
The slow idle tube and 4 small holes for transition to the primary is slightly below the throttle plate, and as you know the primary is above.
The location for slow idle tube is because the throttle plate is closed at idle, so there will be higher vacuum to pull fuel through that circuit, then as you speed up there is enough air flow to draw fuel from the primary jet.
Also the slow idle fuel cuttoff solenoid is to cut fuel when not at idle, I think above 15mph.
If this solenoid is not energized at idle... it want idle.. ha ha.

The only time my car ever dieseled was when I ajusted my idle mixture too lean.
Running the car too lean will make your car run hotter in the cylinders, and it's not good for the engine over time.

[packattack9000]

Can someone just send a pic of the vacuum lines all around the carb? I can't figure out where the lines from the air diaphragm go. Help please!! I need back on the road asap!!