Boost leak test done, question about leaking IAT sensor?
01-23-2010, 06:01 PM
#1
Le Mans Master
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Location: Shreveport/Bossier Louisiana
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St. Jude Donor '08
Boost leak test done, question about leaking IAT sensor?
So I have been struggling with boost leaks for sometime now, and I dont I havent felt or seen the car run at its full potential in a long time. I made a boost leak tester for my APS TT car and started hunting. These are the leaks I found:
-Boost controller solenoid
-vacuum lines in the back of intake manifold
-rubber coupler in charge pipe
-an old AIR pump line in the bumper
-Meth line where it T's into dual nozzles
-tiny leak out of my relocated IAT sensor?
I noticed as I was searching that air was coming out of the weather pack pigtail and that when I unplugged the pigtail, air would rapidly escape the system. I thought this was kind of weird, but I pulled the exact same IAT out of my '99 suburban, and I can also blow through it. Is this normal, and what can I do to keep air from escaping through the sensor?
FWIW, I wasnt able to achieve over 10-11 psi before, and I tested it up to 28 psi on my boost gauge with NO leaks
-Boost controller solenoid
-vacuum lines in the back of intake manifold
-rubber coupler in charge pipe
-an old AIR pump line in the bumper
-Meth line where it T's into dual nozzles
-tiny leak out of my relocated IAT sensor?
I noticed as I was searching that air was coming out of the weather pack pigtail and that when I unplugged the pigtail, air would rapidly escape the system. I thought this was kind of weird, but I pulled the exact same IAT out of my '99 suburban, and I can also blow through it. Is this normal, and what can I do to keep air from escaping through the sensor?
FWIW, I wasnt able to achieve over 10-11 psi before, and I tested it up to 28 psi on my boost gauge with NO leaks
01-23-2010, 09:14 PM
#3
Tech Contributor
Although little things can add up, a little leak isn't going to affect your performance that much. Obviously only you or someone seeing it first hand can decide how significant the leak is. You might be able to put some silicone on the bottom side of the sensor. Just don't get anything on the thermistor and you'll be fine. 
01-23-2010, 11:04 PM
#4
Le Mans Master
Chris, check your wastegate lines and fittings. I know your setup is diferent but I keep melting mine. Im going to use stele brake line instead of vacuum tubing.
01-24-2010, 02:25 AM
#5
Le Mans Master
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St. Jude Donor '08
Although little things can add up, a little leak isn't going to affect your performance that much. Obviously only you or someone seeing it first hand can decide how significant the leak is. You might be able to put some silicone on the bottom side of the sensor. Just don't get anything on the thermistor and you'll be fine.
