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2.9L '86 Vacuum System Mystery Component


BoomTexan

Forum Member

Joined
Jul 7, 2025
Messages
24
Points
101
City
Atlanta
Vehicle Year
1986
Transmission
Automatic
Hey y'all, I've been looking for a replacement for this part, but can't find a reference for what it is anywhere. Might be one of those early 1986 fuel injector parts that got phased out real quick.
Anyways, I'm reasonably certain that it's part of the reason for my choppy idle and occasional brake booster cut-outs. It's the cylindrical canister along the fender. Attached also are a couple other photos showing where the vacuum lines terminate. One goes to the splitter leading to the brake booster and FPR/overhead air compartment, the other goes to the throttle body.

20260118_143719.jpg


If any of yall know what this part is called, or what's stored inside the canister, it would be a huge help. Looks like the line broke at some point and was glued back on. Hesitant to take it apart or remove the lines for fear that I might not be able to properly reattach.
 

Attachments

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It looks like an aftermarket cruise control servo to me.
 
Yall are absolutely right, just disconnected it and have been messing around with vacuum. Brake booster problems seem to be completely gone now. Don't think it was sealing well. Thanks for your help!

I love (hate) owning such a heavily modified truck, something new every day that's tough to find online.
 

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