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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#76959 05/01/2007 5:56 AM | Joined: Feb 2007 Posts: 28 Apprentice | | Apprentice Joined: Feb 2007 Posts: 28 | Bought my truck 1950 GMC 100 last month and it has a 228. It has idled and ran rough. I have noticed a pipe about the size of a straw coming from the rear of the intake manifold closest to the firewall. The pipe is open at the end. I searched this site and came to the conclusion it is from the vacuum line for the wipers (which have been coverted to electric). When I plug the top of the hollow tube with my finger the engine runs smoother. Am I correct about this being a vacuum line? Should it be capped some how? What should I do with it? | | |
#76960 05/01/2007 6:14 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Smittster,
It sounds like you have diagnosed the problem perfectly. I have plugged vacuum lines with rubber caps made just for that purpose..usually available from a hardware store or auto supply store. The only caveat would be launching the little plug into orbit if the engine backfires.
This might be what happened to the previous rubber cap. Threading a small machine screw into the hole would offer more bullet proof results.
Stuart | | |
#76961 05/01/2007 7:24 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I usually run a short length of hose to a bolt, then put a hose clamp around the bolt. Select a size that won't get inhaled, and the clamp will keep it from leaving.
Otherwise use a pipe plug in the manifold hole.
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