crankcase breather hose

[phatcap]

i was changing my oil today and while it was draining i decided to do a quick check of all the hoses/vacuum lines. i discovered the crankcase breather or vent hose (i think that's what it's called) was all cracked and deteriorating. it's an 8" long 15/32" inside dia. hose with a bend in it that goes from the valve cover to the throttle body. i couldn't for the life of me find it anywhere online and of course the motorcraft part no. on it was faded and rubbed off. so i went up to murray's, got a section of the crankcase hose they had there for 2 bux and slapped it on. it doesn't have the bend in it but worked anyway.

before doing this i had a somewhat rough idle and slight miss during acceleration. but now it seems to have smoothed out a lot. funny how replacing one little thing like that can make such a big difference. come to think of it, the same thing happened to my girlfriend's jeep a couple years ago. it was running like garbage, replaced that hose and it ran smooth. sorry for the long post, but i read a lot of complaints on here about rough idle and such so i thought this might help somebody...

ps...i did actually read something somewhere about how if this hose is bad or leaking it can cause poor performance and gas mileage.

 

[Earl43P]

Good job.

You found a vaccuum leak, which causes unmetered air to enter the combustion process, making it run shyttay.

 

[brbrbarber]

Mazda B 2500 1998
Engine starts but dies when cold, throttle sticks and revs between shifts. I removed the air intake hose from the throttle body and found black deposit inside throttle body. I think the deposits are from a deteriorated crankcase breather hose. A warning on the throttle body says do not spray throttle cleaner on the throttle body or throttle plate. How do I clean the throttle body?

 

[Earl43P]

Seafoam liquid or DeepCreep spray won't hurt it.

Unless the TB is sticking, there is really no benefit from cleaning it.