# Boost/Vac leak, or not? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [August 10, 2005, 4:41am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420 "2005-08-10T04:41:15Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 4:41am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/1 "2005-08-10T04:41:15Z")
Ok, i’ve been trying to trace this down for 3 days now for the two or three hours after work before it gets dark and its pissing me off :tdown: The car runs perfectly fine, idle is MAYBE 50-100 rpm high, but I am really not certain as I never paid much attention to it before. I can rev it all the way to redline, so long as it is not above 6 psi. Once it gets to about 6 psi, the car will backfire hard, twice usually, and then go limp (out of boost, but still running). Also, one time the car just completely stalled out. So, pressure/vacuum leak right?? Everything points to that but for the life of me I can’t find it, i’ve replaced clamps, suspect hoses, not even ones with evident wear, i mean i’ve check all the ic piping, and they’re fine, and i’ve replaced probably 5 vac. lines. I sat yesterday spraying carb cleaner over all of the lines to try to get the car to studder wherever the leak is, nothing. So i guess my question is, what better way can i check for a vacuum leak, or, what else could my problem be? ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [August 10, 2005, 4:56am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/2 "2005-08-10T04:56:46Z")
doesnt sound like a vac/boost leak. sounds like an issue with a sensor ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 4:57am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/3 "2005-08-10T04:57:45Z")
pressure sensor i assume? ---
**Author:** ![Zer0DazE](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zer0daze/32/7624_2.png) [@Zer0DazE](https://forums.speedlife.net/u/Zer0DazE)\ **Post date:** [August 10, 2005, 5:14am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/4 "2005-08-10T05:14:37Z")
could be… or it could be any number of sensors. anything that has anything to do with fuel control is where i would start looking. maybe a loose/broken connector or bad ground somewhere too. ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 7:24am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/5 "2005-08-10T07:24:29Z")
fun stuff… time to waste another evening on this pos japbox :tdown: I’m really starting to like my sohc vtec civic now, it doesnt break :tup: ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [August 10, 2005, 7:48am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/6 "2005-08-10T07:48:58Z")
you should swap a front drive sr20det into the back of that thing. ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 8:39am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/7 "2005-08-10T08:39:14Z")
shutup nissan fag 😛 ---
**Author:** ![Blue\_Eyed\_Devil](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/blue_eyed_devil/32/7292_2.png) [@Blue\_Eyed\_Devil](https://forums.speedlife.net/u/Blue_Eyed_Devil)\ **Post date:** [August 10, 2005, 9:01am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/8 "2005-08-10T09:01:16Z")
Maybe… 1)Crank trigger 2)injector seals ---
**Author:** ![Viper966](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/viper966/32/7268_2.png) [@Viper966](https://forums.speedlife.net/u/Viper966)\ **Post date:** [August 10, 2005, 10:43am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/9 "2005-08-10T10:43:04Z")
i wouldnt say crank trigger, cuz he can make it to redline, its a boost dependant issue… id say map sensor is probably bad, or maybe an injector is sticking… do u have a wideband that u would be able to check why it chokes, is it too much fuel or not enough, my guess would be its totally cutitng out, meaning the map sensor isnt reading the extra boost if it was a boost leak ud still make it to the psi u want just wouldnt have teh cfm to have power there ---
**Author:** ![JDMR2](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdmr2/32/7587_2.png) [@JDMR2](https://forums.speedlife.net/u/JDMR2)\ **Post date:** [August 10, 2005, 10:48am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/10 "2005-08-10T10:48:37Z")
maf = poof ? ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 11:29am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/11 "2005-08-10T11:29:07Z")
anyone got a spare mr2 turbo maf laying around? 🙂 paul, that means you 😃 edit: and no, i don’t have a wideband ---
**Author:** ![JDMR2](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdmr2/32/7587_2.png) [@JDMR2](https://forums.speedlife.net/u/JDMR2)\ **Post date:** [August 10, 2005, 5:52pm UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/12 "2005-08-10T17:52:10Z")
if you would man up, i could sell you my old MAP sensor 😉 ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 10, 2005, 7:45pm UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/13 "2005-08-10T19:45:28Z")
howso biatch 😛 that and i was plenty ready to buy your setup, BUT YOU NEVER TOOK IT OFF! :mamoru: ---
**Author:** ![JDMR2](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdmr2/32/7587_2.png) [@JDMR2](https://forums.speedlife.net/u/JDMR2)\ **Post date:** [August 11, 2005, 12:30am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/14 "2005-08-11T00:30:15Z")
lol buy my new terblow, or help me get the stocker off and we’ll call it a day 🙂 ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 11, 2005, 5:11am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/15 "2005-08-11T05:11:04Z")
wtf, thought you sold the … first new one, im confused, and sweet, i’ll take the stock one for free 😉 ---
**Author:** ![JDMR2](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdmr2/32/7587_2.png) [@JDMR2](https://forums.speedlife.net/u/JDMR2)\ **Post date:** [August 11, 2005, 7:07am UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/16 "2005-08-11T07:07:09Z")
then help me get the bigger one on now 🙂 ---
**Author:** ![chino](https://avatars.discourse-cdn.com/v4/letter/c/bcef8e/32.png) [@chino](https://forums.speedlife.net/u/chino)\ **Post date:** [August 11, 2005, 3:10pm UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/17 "2005-08-11T15:10:21Z")
ill be working on my car again tonight, and this weekend (if i dont fix it tonight) so i’m down to give you a hand :o ---
**Author:** ![woody](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/woody/32/7191_2.png) [@woody](https://forums.speedlife.net/u/woody)\ **Post date:** [August 13, 2005, 12:12pm UTC](https://forums.speedlife.net/t/boost-vac-leak-or-not/1420/18 "2005-08-13T12:12:04Z")
ive got the same problem when i run 16 psi with my stealth tt. i get a few backfires up around 4500 rpm and then i think the fuel cuts for a second. scared the shit out of me. i droped the boost under 10 (stock) and it pulls fine. i also get some problems when i start the car…the mfi relay goes crazy clicking and the fuel cuts and starts real quickly for like a minute.