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View Full Version : Low Vaccum and rough idle! Need Help!

wickeds13
01-02-2012, 06:30 PM
Okay Zilvia peeps. I need some help trying to find my vaccum leak. I already searched online for tips, but can't seem to find the right one that can help me out.

Parts I checked already:
-Vaccum Lines
-Intercooler Pipings and intercooler for cracks
-Intake pipe
-MAF
-Spark plugs

All of these parts are fine. I also did a compression test today. Compression for all ports are really good. 140-150 across.

So my vaccum is reading 1, but when I mash on the pedal I still get about 5psi of boost. My boost reading before this problem was 10psi and vaccum at 25. I need some REALLY big help guys.

The parts I have On:
-Walboro 255lph
-CX racing intercooler
-Koyo Radiator
-Garrett T28 turbo with chipped fins
-XO2 Racing Full exhaust System
andrew600
01-02-2012, 06:34 PM
spray ether or something around vac hoses and fittings. shouldnt take to long to find.
MurkyRiversS13
01-02-2012, 07:23 PM
Try a boost leak test. Some things are entirely to hard to see. I thought all my shit was good and tight then I leak tested and had major leaks.

Vac reading 1 could also be mechanical timing, but then again, check your vac line going to your boost gauge.
wickeds13
01-02-2012, 08:44 PM
spray ether or something around vac hoses and fittings. shouldnt take to long to find.

What should I spray? Brake Cleaner or EFI/CARB Cleaner?
wickeds13
01-02-2012, 08:45 PM
Try a boost leak test. Some things are entirely to hard to see. I thought all my shit was good and tight then I leak tested and had major leaks.

Vac reading 1 could also be mechanical timing, but then again, check your vac line going to your boost gauge.

I'll try it out. Thanks!!!
Garage Life
01-05-2012, 04:12 PM
If you can get your hands on a evap smoke machine, you can find the vacuum leak in seconds.. OrIf you want to find the boost leak, try making your own boost leak tester.. Plug up the coupler to the TB, and run pressure through after the turbo outlet and search for leak. You can make it out of intercooler piping, some fittings from homedepot and a regulator and compressor.. Just run about 10psi and listen for leaks.