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Identifying and Addressing a Vacuum Leak

18:10
35:29
40.3K views

At 18:10 in

Rocky Mountain Race Week Day 3: Race Day in Pueblo! How Will Uncle Rob Handle The High Altitude Air?

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What happens here

After the disappointing first race, the driver inspects the engine bay of the GMC Yukon XL. He quickly identifies a disconnected EVAP line, which is causing a significant vacuum leak. For a temporary field repair, he uses electrical tape to cover and seal the open vacuum port. He then discusses the next steps, including sending his car's tune to Jamie from PFI (Performance Fuel Injection) for altitude adjustments.

Goal: Isolate and temporarily repair a specific engine problem (vacuum leak)

Tools and materials

  • Electrical Tape — Temporarily sealing the vacuum leak
  • GMC Yukon XL GMC — The vehicle being repaired
  • HP Tuners — Software used to adjust the car's engine tune for altitude
  • Laptop/Computer — To access and modify engine tuning software

What they say

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but what happened trans wouldn't hold any power really as soon as like as soon as i was coming up on the two step it uh it just slipped and lurched forward and then i'm like oh that doesn't feel good i thought maybe i shut it off thought maybe i broke something and nothing was leaking and he pushed it off to the side and he lined me up along the side of the track there just to test it again and it did the same thing it just won't hold any power we took it on the road course a little bit over there and it won't hold anything over a couple pounds of boost before it starts slipping so i guess i'm calling lonnie's that sounds like uh band the intermediate band and direct clutches could very well be mine did that once i'd get on i'd get on the transit break and it would start to build up like it was you know resistance and then just go like it was just kind of like it wasn't there anymore yeah and you're like but it would still drive yeah and then it just slowly starts to get worse that's what i was thinking i'm gonna it'll drive fine so i'm gonna try to get as far back to great bend where the trailer is as i can before i gotta call the tow truck and then you know hopefully it makes it all the way is it cruising around it's okay i mean i know i could put a turbo 400 in it and switch everything around it just feels like giving up it is and that's that's the terminology i use too

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