Thermal Vacuum Valve (Part Number EAC 5086 or EBC 4600)
¾” Open End Wrench
The Thermal Vacuum Valve (also known as the Vacuum Thermal Valve and Fuel Injection Thermo-Time Switch) is mounted on the left side of the Fuel Rail. If you’re going to take off the Fuel Rail or Air Rail, take this off first – I didn’t on my ’90 Coupe and ended up breaking one of the plastic male connectors going to the vacuum hoses – a $100 mistake (ouch!). There are two vacuum hoses connected, mark which one goes where and pull them off. Use the ¾” open-end wrench to get the valve off – don’t worry, no fuel will come out.
(Viewed from Left Side)
The original Vacuum Valve on both of my cars was labeled with part number EAC 5086. This valve has a small foam air filter under the cap – I just cut a small piece of foam I had to replace it on my ’91 Coupe…
I ordered a replacement from Rusty Cullens’ BuyEUROParts.com for $100.25 and they substituted part number EBC 4600, a valve with blue plastic and without a filter that so far seems to be fine…
Questions/comments: Email me.