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.
A hose with a crack is caused by oil.
( z1 cause :ARG0 ( z2 oil ) :ARG1 ( z3 hose :ARG0-of ( z4 crack ) ) )