Replacing manifold hoses on a 2.0

[simonr]

My 1976 2.0 Idles very rough until it warms up . Has all the symptoms of running lean. The plugs are white and the engine hunts at idle until it warms up .This takes about 5 to 10 minutes of run time in 85+degree weather. I have replaced injector seals , all vacuum hoses, cap, Rotor ,New k&n air filter. I am about to change the manifold hoses because if they are half as old and brittle as the rest of the hoses were the need to be changed out. What is the simplest way to do this? I would prefer not to have to pull the injectors again as they are brand new . My goal is to not have the car be quite so cold blooded as fall and winter will be here soon. Any and all ideas are more than welcome

[3D914]

Simon,

Changing the hoses is almost always a good idea. Most of the larger ones connect to the air cleaner above the throttle valve, so they won't have much affect on vacuum. The first think you might want to look at is your Aux Air Valve, or Idle Bypass. If its sticking, and many of these do, you're cold start will never be right. You may also need to check the cold start injector that sits at the back of the plenum on the driver's side.

Good luck,

[Dave at Pelican Parts]

The big fat hoses from the plenum to the intake runners are replaced by removing the intake runners from the engine. Three nuts at the outer end (for a 2.0, all others use four!) and pull the whole shebang outward. You may be able to leave the injectors in place.

If not, there's only one nut that holds each injector onto the intake runner; you can probably leave the injectors plugged into the wiring harness and the fuel system.

Don't clamp the big fat hoses at both ends, they need to be able to slide on the pipes as the engine expands and contracts with heat.

--DD

[John Rogers]

When you pull the intake runners, check to make sure the flange that fits to the head is flat. Also check to see if there is a gasket there, if so it is probably in bad shape too. Finally look at the plenum closely on the bottom surfaces as I have seen several with cracks and/or small holes and those can be filled or patched.