(Found It) Need help locating vacuum leak....
I have a leak somewhere in the vacuum system that I can't seem to locate. I can hear it when the boost guage is in vacuum. Sounds like a high pitched whistle. As I accelerate and vacuum goes to boost, the whistle changes pitch and gets quiet as the guage approaches zero. I am also experiencing some stumbling while in gear at idle (sitting at a traffic light, for instance). Also, when I turn the engine off, the whistle continues until the boost guage returns to zero. I have tried to locate the leak with my propane torch, but so far no luck. I thought I had isolated it to the lower connection on the intercooler, but after resealing both upper and lower, no change. I sprayed so much propane around the vacuum and supercharger fittings that I was almost ready to pass out. Never did hear an increase in idle. How long do you have to apply the propane to a leaky connection before the idle increases?
Anyone got any ideas of other places to check for leaks? I thought maybe it was the line connection on the boost guage, but the whistle is louder outside the car than inside....
-----------------------------------------------------------------------------------
Well, the propane trick didn't provide any results, but I found the source of the leak. The upper flange stud nuts on the lower intercooler tube were loose (for some reason). I must have not gotten them tight enough when I replaced them after replacing the engine mounts. Cheap fix, just torqued them down, and no more leak.
Thanks for the help, guys!!!!
I have a leak somewhere in the vacuum system that I can't seem to locate. I can hear it when the boost guage is in vacuum. Sounds like a high pitched whistle. As I accelerate and vacuum goes to boost, the whistle changes pitch and gets quiet as the guage approaches zero. I am also experiencing some stumbling while in gear at idle (sitting at a traffic light, for instance). Also, when I turn the engine off, the whistle continues until the boost guage returns to zero. I have tried to locate the leak with my propane torch, but so far no luck. I thought I had isolated it to the lower connection on the intercooler, but after resealing both upper and lower, no change. I sprayed so much propane around the vacuum and supercharger fittings that I was almost ready to pass out. Never did hear an increase in idle. How long do you have to apply the propane to a leaky connection before the idle increases?
Anyone got any ideas of other places to check for leaks? I thought maybe it was the line connection on the boost guage, but the whistle is louder outside the car than inside....
-----------------------------------------------------------------------------------
Well, the propane trick didn't provide any results, but I found the source of the leak. The upper flange stud nuts on the lower intercooler tube were loose (for some reason). I must have not gotten them tight enough when I replaced them after replacing the engine mounts. Cheap fix, just torqued them down, and no more leak.
Thanks for the help, guys!!!!
Last edited: