Vacuum Hoses...My Head Is Going To EXPLODE

[amc78concord]

Do you think it may be timing though?

[IowaEagle]

Never hurts to check timing.  But, timing is dependent on no vacuum leaks and/or bad vacuum circuits.

[ericarmstrong]

Checking timing never hurts. It could also be clogged jets or poor fuel mix/delivery.  I would guess something vac related.  Try this, its a pain, but has helped me solve vac issues on multiple eagles; Buy a couple 5 dollar vac cap kits, Disconnect all your vac hoses at the carb and manifold, cap them all, and see how it runs. If it clears up, plug them in one line at a time until you  find the suspect vac circuit. Then run that circuit back line by line. you can use pliers to pinch each split one at a time. This method is time consuming, but works like a charm.  

[mudkicker715]

Yes it could be timing.the timing advance is som ewhat comtrolledby the computer.

Best bet is understand what every vac line does.

[ammachine390]

Since the vacuum storage canister have a tendency to rust out, I would start by pinching the hoses going through the fenderwall. If that fixes it, probably a rusted through canister. Also, do you have a vacuum gauge? They are an excellent tool, and can tell you if you have a vacuum leak.

The hose, has a "Y-Connector" on the end to go to 2 different places...  

Is that green whetherpack connector in the middle of this pic unplugged? Also, does that vacuum line above the break booster just go to nowhere?

[ericarmstrong]

Since the vacuum storage canister have a tendency to rust out, I would start by pinching the hoses going through the fenderwall. If that fixes it, probably a rusted through canister. Also, do you have a vacuum gauge? They are an excellent tool, and can tell you if you have a vacuum leak.

They can also help diagnose basic timing issues. Good advice, get a vac gauge.

[amc78concord]

Is that green whetherpack connector in the middle of this pic unplugged? Also, does that vacuum line above the break booster just go to nowhere?

The green "Weatherpack" connector goes nowhere.  I don't know where it is supposed to go  

Also that piece of vacuum line above the brake booster comes from the inner fender... which right now doesn't go anywhere because I don't know where those lines go to... this is what I'm stumped about because of it going through the fender... I probably didn't make it clear enough when I posted the picture of me holding up that vacuum line...That line is from the inner fender well..



I also hear a LOVELY hissing sound when the car is running...which leaves me to believe there is vacuum miscue somewhere..

[ammachine390]

If you can hear a hissing you definitely have a leak somewhere. Make sure any unused/open vacuum lines get capped or plugged. Then what you can do is take a can of carb cleaner and spray around where the hiss is coming from, if the engine starts to idle better, then you have found a general location of the leak.

Another thing to try, remove the hose from the brake booster and cover it with your finger. If it idle improves, your brake booster is probably leaking.

Not sure if it's the that connector, but the wide open throttle switch on the passenger side of carb uses a green weatherpack connector.

[amc78concord]

I'm at my school auto shop today with my Wagon.  After about 5 minutes I found where the hissing was coming from.  It was a a connector on the intake manifold.  I tried putting that to the hose that "went through the fender wall."  Well as it turns out, that wasn't it because it would make the car backfire and run really terrible.  Then I found out that the hose "that went through the fender wall" is really a 4 wheel drive hose from the vacuum storage canister...and doesn't go through the fender wall....    I didn't follow the hose correctly.  But my 4 wheel drive ingages just fine, I don't know where it is supposed to go though. I checked diagrams and that line on the diagram goes nowhere...   So I just plugged it. And I plugged the line that is coming from the manifold.  It runs a lot better, but has that hippity skippity fluctuation at times... then when I put it in drive it's a little worse.  Something still isn't right, but its a lot better.

Oh, I also checked the timing.  It's right on the money...

[68AMXGOPAC]

Ahhhhhh so that's the 4WD vacumm canister,lol, I have my supply vac for the heat valve hooked there, it works : ) So now I see I need to look for the other elusive canister that is actually for the 4WD.I wondered why there wasn't 2 ports on that plastic one !!Right now all of my 4WD vacumm lines are out except for the triple one from the switch through the firewall. The rest were either melted or cut or just funky. I found some black line that is an exact match for it , thinking of makeing some different colors up useing the SEM paint......

[IowaEagle]

Interesting they used that concealed one for 4WD on some and the plastic version, on the other side for others.

[amc78concord]

Interesting they used that concealed one for 4WD on some and the plastic version, on the other side for others.

Ya, weird... But when you own an Eagle you gotta be expecting that...

At least it makes our lives more interesting trying to figure it out