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My BISS is bubblin'

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10+ Year Contributor
1,073
1
Sep 2, 2012
Findlay, Ohio
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So I'm guessing this is a boost leak? How do I go about fixing this?
 
Replace the seal.

Harbor freight has kits that I like to get. Mine came in a blue box :)
 
It would be considered a boost leak but, in all honesty, I havent had a dsm that didnt have that dam leak. My current dsm has it now too, and she boost fine with all other boost leaks fixed. that biss screw leak is so minor.
 
It should be fixed, because leaks like that affect vacuum more than boost. These small leaks are so insignificant when it comes to boost that I completely doubt that the stock equipment (MAF + 8-bit ECU) could even measure that small of a leakage.
 
Alright, thanks guys, and I just take the screw out and put that underneath or what? LOL

ALSO

speaking of vacuum vs boost. What should vacuum be at idle? Mine sits a tiny bit above the -7 on the stock boost gauge. Should it be in the solid area which looks like it would be -2 or so?
 
I thought so, but I didn't want to seem mean LOL. I guess I'll grab one from autozone. When I get my check. Would connecting that from the wastegate hose thing be the spot for that?
 
Most tee of from the fpr

I would personally prefer that the OP doesn't T off the CPR. Instead use the Taboo speed shop diagram to remove or reduce the vacuum hoses and get a reading strait off the throttle body.

However if you want to keep all your emissions, etc the the FPR is a common location
 
Got a boost gauge and I tapped into the line going into the afpr AND it works, but reads almost exactly 2.5 psi lower than the computer boost gauge, idle sits at about -10 and max seems to be 10-11. Definitely an indicator of a boost leak? I don't think the gauge is leaking
 
On stock cams and idle around 750 rpms, it should be around -17 or -18 sometimes point more or less. I would say that if the gauge is reading correctly, assuming it is hooked up right, that you ave a boost leak.
 
On stock cams and idle around 750 rpms, it should be around -17 or -18 sometimes point more or less. I would say that if the gauge is reading correctly, assuming it is hooked up right, that you ave a boost leak.

Alright, well I bought a boost leak tester, should be here friday. I'll be back here and probably show you guys 100 leaks LOL
 
I have an issue with pulling low vacuum. At idle its about 10 inches. I did a boost leak test and fixed all the leaks except for a small one at the throttle shaft. It's so small that I doubt I'd be loosing that much vacuum, so I'm excited to see if that fixes your vacuum!
 
I have a very small leak at the throttle body shaft and the injector o-rings. I put high strength rtv on the o-rings but they still leak when i put 10+ psi in the intake. It seems to hold any pressure under that! My BISS leaked but just put windshield sealant over the screw since i knew it was set right and it remains leak free. NOT trying to thread jack!
 
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