So I've developed another small vacuum leak on my 2001 XJ8, and the check engine light is back. The leak is on the right side where the Air Assist tubing goes into the intake manifold between two of the injectors. The engine idles rough for about 30 seconds until the intake starts to get warm, and the leak appears to seal itself,and is no problem until the engine cools down. I have another tubing from a parts car but it doesn't look great either, as one of the attaching rings is cracked. Is it possible to buy this tubing new? I've done a Google search but haven't turned up anything. Or is there a reliable fix, like a tube of RTV to permanently attach the tubing?

 

What I've done in the past is use super glue and heat shrink. There is some heat shrink that has a sealant inside, so as you heat it, the sealant is just added insurance to keep moisture and dirt out. Where the leak is, I just cut the pipe, slip some heat shrink over, super glue the 2 pieces back, let it set, then push the heat shrink over and shrink it. Done this repair on the part load breather hoses as well, seems to last a while . Or you could just buy a new one.

 

Thanks, I will give that a try. Thought I would call the dealer tomorrow and see how much of a second mortgage I'll need to buy a new one.

 

Did it work? I might be having same problem.