Vacuum leak test

energiesource · April 21st, 2010, 09:47 PM

So ive tried water, didnt change the idle because its so shitty i cant tell where the hole is, im pretty sure i have a vacuum leak. is there a home made smoke machine way to do this like dry ice or 'fog juice' or what? because the ether or tb cleaner doesnt work.

RyanGT · April 21st, 2010, 09:49 PM

It will change the idle with carb cleaner if you hit the leak. Water only works if it is an exit (pressurized which yours isnt). I have tried a home made smoke machine and all it did was make a mess. A real smoke machine is actually pressurized to put it throughout the system.

Shaun03GT · April 21st, 2010, 10:02 PM

I think smoke machines are expensive as shit. But yea hit it with carb cleaner or starter fluid.

energiesource · April 21st, 2010, 10:03 PM

yeah i know! like $1500 atleast.
even the going shop rate at $134 an hour is expensive for a smoke test.

Shaun03GT · April 21st, 2010, 10:06 PM

Thats nuts. Yea my car had a small leak when I was getting tuned, my tuner Mike Dez hooked up the smoke machine, it was coming from the TB, I put the gasket on wrong (FML)

But yea, hit it with starter fluid or carb cleaner

RyanGT · April 21st, 2010, 10:07 PM

Yeah its expensive. I looked for a long time. Buy a few cans of carb cleaner is the only realistic way to find it. Replace questionable hoses/plugs. If you can't find it, you might not have one

. Unless it is idling so bad you can't tell lol. But if that was the case it would be loud enough to hear. Have you tried using a hose and plugging one ear? To get a direction of where the sound is coming from. A big leak would be noticeable, and a small one would whistle. Medium one would jump when hit with carb cleaner instantly. So you have a few options.

I usually look with a hose to my ear and try to narrow it down, then spray that area's joints/plugs/hoses/nipples.

energiesource · April 21st, 2010, 10:07 PM

how do you put the gasket on wrong? lol
maybe i did the same. although the problem was happening when i switched my tb/plenum over back to stock.
ill try that, thanks.

energiesource · April 21st, 2010, 10:09 PM

Originally Posted by RyanGT

Yeah its expensive. I looked for a long time. Buy a few cans of carb cleaner is the only realistic way to find it. Replace questionable hoses/plugs. If you can't find it, you might not have one . Unless it is idling so bad you can't tell lol. But if that was the case it would be loud enough to hear. Have you tried using a hose and plugging one ear? To get a direction of where the sound is coming from. A big leak would be noticeable, and a small one would whistle. Medium one would jump when hit with carb cleaner instantly. So you have a few options.

I usually look with a hose to my ear and try to narrow it down, then spray that area's joints/plugs/hoses/nipples.

well i cant really find anything but the car is acting like someone unplugged the vacuum line. which its not
plus im only getting 14 inHg and my friends car was getting 20 inHg. i had cams done but that still wouldnt lower it friggen 6 inHg

Shaun03GT · April 21st, 2010, 10:09 PM

The gasket goes on so theres like a slit that matches up with the TB, and I was rushing cause I just did a plug change and wanted to get it done. Stupid mistake.

01MGGT · April 21st, 2010, 10:12 PM

Some cams can drop it quite far. What cams are you running? Check the rubber elbow for the breather on the driver side valve cover for cracks. Check the hard red plastic hoses for damage as well.

energiesource · April 21st, 2010, 10:14 PM

what if i have a valve cover gasket leak, would this cause it too or is this strictly a tb/plenum/intake/vacuum hose problem?

RyanGT · April 21st, 2010, 10:27 PM

Yes valve cover leak will cause this. Since they are directly connected to the intake after the MAF.

And cams beyond stage 2's will idle that low. I know yours a custom but just a comparison. My stage 2's idle that low. 14-15 ideally at 770 rpm.

April 21st, 2010, 09:47 PM	#1
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	Vacuum leak test So ive tried water, didnt change the idle because its so shitty i cant tell where the hole is, im pretty sure i have a vacuum leak. is there a home made smoke machine way to do this like dry ice or 'fog juice' or what? because the ether or tb cleaner doesnt work. __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

April 21st, 2010, 09:49 PM	#2
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	It will change the idle with carb cleaner if you hit the leak. Water only works if it is an exit (pressurized which yours isnt). I have tried a home made smoke machine and all it did was make a mess. A real smoke machine is actually pressurized to put it throughout the system. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

April 21st, 2010, 10:02 PM	#3
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,441 iTrader: 12 reviews	I think smoke machines are expensive as shit. But yea hit it with carb cleaner or starter fluid. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

April 21st, 2010, 10:03 PM	#4
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	yeah i know! like $1500 atleast. even the going shop rate at $134 an hour is expensive for a smoke test. __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

April 21st, 2010, 10:06 PM	#5
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,441 iTrader: 12 reviews	Thats nuts. Yea my car had a small leak when I was getting tuned, my tuner Mike Dez hooked up the smoke machine, it was coming from the TB, I put the gasket on wrong (FML) But yea, hit it with starter fluid or carb cleaner __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

April 21st, 2010, 10:07 PM	#6
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	Yeah its expensive. I looked for a long time. Buy a few cans of carb cleaner is the only realistic way to find it. Replace questionable hoses/plugs. If you can't find it, you might not have one . Unless it is idling so bad you can't tell lol. But if that was the case it would be loud enough to hear. Have you tried using a hose and plugging one ear? To get a direction of where the sound is coming from. A big leak would be noticeable, and a small one would whistle. Medium one would jump when hit with carb cleaner instantly. So you have a few options. I usually look with a hose to my ear and try to narrow it down, then spray that area's joints/plugs/hoses/nipples. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

April 21st, 2010, 10:09 PM	#9
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,441 iTrader: 12 reviews	The gasket goes on so theres like a slit that matches up with the TB, and I was rushing cause I just did a plug change and wanted to get it done. Stupid mistake. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

April 21st, 2010, 10:12 PM	#10
01MGGT Hardcore Enthusiast Join Date: Oct 2009 Location: Alamogordo NM Holloman AFB Posts: 1,200 iTrader: 0 reviews	Some cams can drop it quite far. What cams are you running? Check the rubber elbow for the breather on the driver side valve cover for cracks. Check the hard red plastic hoses for damage as well. __________________ 375hp 380tq Vortech v1 7.5 psi CMS stg1 Cams 75mm TB/Plenum Flows O/R X AFM MrFreeze Meth Steeda Springs Sniper vids http://www.youtube.com/user/01mggt Mineral Grey Club member #14 Military Crew E-4 Predator Crew Chief Holloman

April 21st, 2010, 10:14 PM	#11
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	what if i have a valve cover gasket leak, would this cause it too or is this strictly a tb/plenum/intake/vacuum hose problem? __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

April 21st, 2010, 10:27 PM	#12
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	Yes valve cover leak will cause this. Since they are directly connected to the intake after the MAF. And cams beyond stage 2's will idle that low. I know yours a custom but just a comparison. My stage 2's idle that low. 14-15 ideally at 770 rpm. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

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