brnt999

I recently bought an 1984 Bronco 11.I dont know much about mechanics.I was told a rebuilt motor was installed 15,000 miles ago and have no reason to doubt this as the block looks new.I assume it is the original motor--2.8l V6. I noticed that the engine idled very fast and my gas mileage was very poor.Yesterday I had the hood open and the engine running and I could hear a sucking sound. I traced it to a fitting on one valve cover where a larger hose is attached to the fitting and there is a second smaller hole on the fitting where a smaller hose should be attached. I put my finger over the hole and the sucking noise stopped and my idle dropped to normal.I looked for a hose that had become detached but couldnt find one.I taped shut the hole and drove the car last night and the differance is like night and day. The engine runs smoother, the idle is normal, and I have more power. I am assuming my gas mileage is better.My question is can anyone tell me where this missing hose is supposed to run too and if I can do any damage by taping shut the hole.
Thankyou

 

brnt999

I have a Chilton manual on order and when I get it I will be able to identify the parts.But in doing some research on the internet I think the fitting I am describing is the PCV valve elbow.One (larger ) hose connects to the elbow and runs to a saucer shaped cannister behind my hydrolic brake fluid container.There is another hole in the elbow that the sucking sound was coming from.So if I tape off this other hole--will this cause damage to the engine?
Thanks
Brent

brnt999

Mystery solved.Shortly after buying the truck I got an oil change done at a drive-through oil change store and had the pcv valve replaced.I took it back and they discovered the replacement pcv comes with a T that in some applications 2 hoses are attached and in others only one. The valve comes with a plug that if the second hose is not used is to plug the second hole.They forgot to install the plug.