I have a 1973, 1.7. It was idling low/stalling. I noticed the red hose in the picture is no longer attached on the one end. (Not sure if the two are related, but it's a starting point)

Can anyone tell/show me where it attaches?

Any help is appreciated, it saves me the time of looking it up.

Regards,
Terry

Click to view attachment

Head vent. One on the driver's side in front of the intake manifold. One on the passenger side to the rear of the manifold.

Got it! Thank you.
Any chance that is causing the stalling?

Very little. Sorry.

No. But it will cause a hell of a mess.

The photo is not clear enough to determine what the red hose in your hand is for. The circled metal piece is the anti-flashback valve - one hose on each side goes to each head, the center black hose looks like it is going to the intake as it should. Those three hoses are a complete system when attached to the anti-flashback valve.

The red hose in your hand...what is the other end attached to? Are the two red hoses - the same hose? If so, then it should be attached to the head.

You must have me on ignore Jeff, or missed my post?

Hi Curt...No, not on ignore, I saw it. Its just not clear that the two sections of red hose in the photo are of the same hose.

Any 40+ year old vacuum hoses should be replaced anyways, as they are probably not sealing well to their ports.

Jeff, yes it is the same hose. Sorry for the confusion. I found the spot where it should connect to the head.

It clearly does need to be replaced though. It slipped on very easily. I doubt it is sealed well.

Thanks for you help.

Terry

I recently bought the complete hose set that George has assembled at Automobile Atlanta, it was very time saving to have all the sizes and lengths in a single order. They were not all color coded to originals, but they were reasonably priced, sized to fit and cured several vacuum leaks I had been chasing.

Thanks Jamie. I'll check it out. That would make things much easier.

If it was a vac leak, wouldn't the idle be excessively high and impossible to tame? Is how it performs off idle and the rpm it smooths out at relevant? D-jet guesser here. Sealing up ALL of the potential leak points is never a bad thing. ALL of them.

Mityvac kits start at $28 at Amazon. Money well spent.

If the hoses have enough slack, you can try trimming the ends past where they're cracked (regular maintenance). One should check the fuel hoses frequently as well.

Another member out here with a '73 1.7L was exhibiting the same issue a couple weeks ago. We sniped off cracked hose ends, adjusted dwell & timing and got it running, but also found the MPS' diaphragm was shot (with a Mighty-Vac). The member had already set up an appointment with a shop to perform a valve adjustment, oil change, etc. the following week, so we stopped where we were and he'll let the mechanic tackle the rest.

Thanks again. You gave me helpful advice. Time to start troubleshooting.