The vacuum hose that goes from my distributor (in my '74 2.0) to the throttle body, is missing. Is it required? What's the purpose of this hose? Must adjust the timing somehow? If I replace the hose, what impact will it have on how my engine is running?

Steve

That engine should have a vacuum retard line. It should affect idle only. Install it. It connects to the vacuum port that points toward the distributor body, not the one that points away.

QUOTE (McMark @ Jan 21 2005, 11:58 PM)

That engine should have a vacuum retard line. It should affect idle only. Install it. It connects to the vacuum port that points toward the distributor body, not the one that points away.

And for '74 there shouldn't be a port on the throttle body for a hose. (like '73) if you have one it would be sucking air and you'd have a high idle.
-Mike D.

Put a hand vac pump to see if the part is good. Mine leaked on this test and had to be replaced.

Hmm...so if a '74 doesn't have a vacuum port on the throttle body to connect to the distributor, do I just leave it the way it is? If the port is there, I'll reconnect it.

Would this cause my idle to move up and down when is the engine first started and is warming up?

Steve

No, that is lean hunt caused by a vacuum leaks in the hoses or worn out injector seals.


Geoff

QUOTE (Bleyseng @ Jan 22 2005, 09:13 AM)

No, that is lean hunt caused by a vacuum leaks in the hoses or worn out injector seals. Geoff

Thanks. So which vacuum hoses are the usual culprits for "lean hunting"? Just replace all the vacuum hoses connected to the throttle body and other fuel injection parts? MPS, etc..?

Steve

For peace of mind, replace all hoses. For peace of mind plus bonus points, replace all the hoses with real metric lines (not SAE).