Quote:
Originally Posted by McLin
Hi,
how can I find a vacuum leak?
I hear hissing from driver side. I used 2 cans of starter spray and on throttle cleaner. No change in rpm.
I'm on the of my Latin. If I pull the throttle short and raise the rpm I hear a loud air soak. But I can't locate it. Can be the egr, lower intake upper intake or fuel inceppjector. I begin to hate the car.
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vacuum leaks with the upper intake gaskets etc can be a problem to find. with this I will use propane gas to locate these leaks. spraying fluids can be dangerous and destructive to electrical s .
using a small hand held propane torch you install a long rubber hose to the torch end. then turn the valve open to allow a small amount of gas to come out. then probe the engine waiting to hear a rise in RPM. best using a hand held tach to see any RPM shift.
to test this place the hose leaking the propane into the air intake and you will see the rpm rise.
with this type engine around the 130,000mi point the intake manifold will fail where the EGR is. the intake manifold is not properly designed to handle the exhaust gases temp. then the intake manifold will crack internally causing the MAP to go off and then the engine will run extremely rich at first then not at all..