How to check engine vacuum hoses<br>Check each hose for bulges and swelling. If a hose feels soft or spongy when you touch it, this can indicate damage caused by your car's oil. [substeps] A swollen hose that is cracked and hard is often caused by heat damage.
There are many causes for a damaged hoses.
( z1 cause :ARG0 ( z2 thing :quant ( z3 many ) ) :ARG1 ( z4 hose :ARG1-of ( z5 damage ) ) )