How to find Intake Manifold Vacuum Leak?
#1
How to find Intake Manifold Vacuum Leak?
Well it's been months since I did the Hughes plate swap, and ever since I reassembled the car I've had random misfire, felt especially strong at low RPMs. I suspect that perhaps the intake manifold gasket didn't seal, and want to verify first by identifying a vacuum leak.
How can I identify an intake manifold vacuum leak?
How can I identify an intake manifold vacuum leak?
#2
You can do the air pressure test that is documented in the intake plenum leak TSB. This will tell you if you have a leak or not, but not necessarily where. The other option is to get the colored dye from a dealership and run that through the system like you would injector cleaner. You have to have the special light to see the dye, but you will be able to tell exactly where the leak is.
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#8
I don't recommend starting fluid, HIGHLY flammable..... could be just a touch TOO exciting. Carb cleaner, or brake cleaner works as well, and isn't quite so exciting to use. Squirt some directly down the throttle body, to see what it is going to do to engine idle, then hit spots that have the potential for leaks. (basically, any gasket surface exposed to intake vacuum. not to mention vacuum lines....)
#10
That sounds like a good idea. Thank you. Spray bottles are a dime a dozen, and water is, for the most part, free. (yeah, don't use the garden hose for this test..... )