CheepComanche Posted September 15, 2023 Share Posted September 15, 2023 I decided to inspect my vacuum lines this week and I have a few questions that I haven't been able to find the answers to. In the picture with the two vacuum lines going into the intake tube, the upper line just goes around the engine bay where it connects to the air box. I'm unsure of what this line could do. The lower line goes down to the intake manifold as shown the the other picture where it then goes off into the firewall. Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 15, 2023 Share Posted September 15, 2023 Inside the bonnet is a check valve for the those two air lines. I have never found their true purpose. But it runs fine. When I got my MJ, the one on the manifold was plugged as the line was broke, same with the other one but I never noticed a difference since I added new lines Link to comment Share on other sites More sharing options...
cruiser54 Posted September 15, 2023 Share Posted September 15, 2023 Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 15, 2023 Share Posted September 15, 2023 3 hours ago, cruiser54 said: It’s a 2.5L cruiser. Link to comment Share on other sites More sharing options...
cruiser54 Posted September 15, 2023 Share Posted September 15, 2023 Link to comment Share on other sites More sharing options...
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