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.
If the hose is swollen, it's time to replace it
( z1 time :time-of ( z2 replace :ARG1 ( z3 hose ) ) )