Picked up my 4th DSM today! Boost Leak?

[Haytees]

just picked up a gst ( my first FWD) And when i got it, It had some problems starting. The after market theft alarm went bad causing a short from the ignition to starter.. Easy fix.

It has an autometer boost gauge that was reading -15 vacc.. And the car had some jenky couplers on the IC piping that have a tendency to blow off..

Well on my way home earlier the gauge started to read -20 and the boost was goin a little higher than normal (didnt want to see how much it was boosting)

Got home popped the hood and on the vaccuum outlets on the throttle body( like the three nipples and one goes to BOV) They are all elliminated btw.. So they have little caps on em.. And the middle one blew off driving. Could this be the reason for the bad vac/boost readings? Other than that the car drives like a rape ape.

Ps Sorry for the bad grammar few too many beers tonight

 

[l8vr14dsm95]

I would recap the nipple before moving on to anything else vaccum leaks lead to bigger problems.

 

[Haytees]

Yeah will do, i would have done a leak down but i have nothing out here( just moved )

 

[Aphix]

Yes the nipple being off would cause a vacuum leak. However of the three DSMs I've owned there's never been just one vacuum leak. Check injector seals, intake mani gasket, EGR gasket, retorque intake mani, check throttle body gasket, check BISS o ring, check TB shaft seals, check brake booster line, put a check valve on your PCV line. Thats just a few things that I would look at, getting those squared away can give you another 20 hp if they aren't properly sealed.

 

[JeffroTheDSMGuy]

Ya you definitely have some kind of boost/vac leak. In my experience the best and most definitive way to diag a boost leak is with a boost leak tester you can buy or even better make your own. With the car off it makes it that much easier to pinpoint even the smallest leaks (like in the throttle body seals) AND you can make one for under $20!

 

[Haytees]

Is there a write up or tutorial on how to make one? for some reason i cannot search through the forums

 

[KevinRR]

Is there a write up or tutorial on how to make one? for some reason i cannot search through the forums

Here one that I like How to: make a slightly more baller boost leak detector - evolutionm.net