I have a 2004 Ford F-150 5.4L 3V. It has 137K. How can you tell if the VCT Solenoids are bad, or not working right. I was driving the other day, . V8 Engines – Cam Phaser or VCT solenoid troubleshooting – Ok, here’s the scoop. I’ve got a ’06 xlt with a 5.4 3V and several months ago it started acting up. . I think in most cases it’s due to sludge and I found out that Ford dealers (some of Im very curious, what were the symptoms of running 0W20? In the last article I discussed about how the 5.4L variable valve timing works using VCT solenoids. I recommend you read through that article first before this one. My neighbor is still trying to figure out his F-150 5.4 engine problem. . Does anyone know how to check a vct solenoid to see if it’s bad? . If it is the design i am thinking, ford had a strange EGR design where the egr tube goes through the . Jan 3, 2018 – Late model Ford 5.4 engines use variable valve timing (VVT) . If you don’t change your oil on time, sludge builds up in the oil galleries and plugs the small orifices in the VVT solenoids, causing . Don’t chase the symptoms! Chris how do you replace the VCT solenoids on 5.4L 3v engine without removing valve covers. I have seen the new VCTs at the Ford dealer .