Air Cleaner Hoses, Proper Connections

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

brentusbrutus

New member
Joined
Jun 8, 2004
Messages
49
Reaction score
0
Location
canada
Trying to make my motor run better..

I have a 302 with a motorcraft 2 barrel Carberator.

I have all my hose fittings properly connected to my air filter (as per my Haynes Manual Diagram) except for one. My last hose in the book shows it coming from the top of my air cleaner and it just has a note saying "this end goes to Vacuum". I don't know where the "vacuum" is that I am supposed to connect it to. Any help would be fantastic.

Brent

 

Broncoholics

Broncoholics
Joined
Feb 24, 2004
Messages
1,301
Reaction score
4
Location
Washington State
What year is your truck? If its 80's and has all those damn vacume lines it can be a pain to find cause most people forget where they go and cap them off or put them back in the wrong place. You could be tracing vacume lines for days.

Could be bad valves in the heads if its an older engine too.

Leaded gas isn't available now so running unleaded gas will end up recessing the valves up inside the heads and cause leaks which seems like a low idle miss.

Could be the vacume though... I'm sure you got the one from the valve cover to the aircleaner and another from the intake manifold to the aircleaner and exhaust to aircleaner? Or maybe the vacume like was carb to aircleaner??? now I'm getting lost. Those 80's rigs will do that to ya... :wacko:

 

indoz

New member
Joined
Feb 28, 2004
Messages
66
Reaction score
0
Hey Brutus, I see u have quite a few problems, even though I am not familiar with the 302 but I will try to assist. The two vac hoses on the carb, leave the top one blocked, but the bottom hose should be connected to the vac advance on the distributor, the hose from the powerbrake should connect to the intake manifold and the hose from the pcv valve in the rocker cover should connect to the rear of the carb, you could put a t-piece in this hose and connect to air filter, if you have auto transmission then you have one more hose to the modulator valve, this also connects to the intake manifold. The, what you call the block heater, could be only one thing in my mind and that is an exhaust gas crossover in the intake manifold which runs under the manifold plenum to assist in vapourising the cold fuel, the gaskets for this crossover tend to leak fairly quickly allowing positive pressure in the manifold thus reducing the vacuum, causing all sorts of problems, if you can measure the vacuum in your system, should be 14-20 " Hg.I hope this will help you.

BTW. the hoses from powerbooster and pcv valve tend to harden and crack causing more grief.

Henk from Oz

 

Members online

No members online now.

Forum statistics

Threads
22,647
Messages
136,846
Members
25,348
Latest member
guilhermeknob
Top