Vacuum leak?.....

1fst5.0 · June 6th, 2009, 06:23 PM

Whats up fellas, i need ur guys help again.I recently had to remove my upper and lower intake. when i was putting it all back, i layed a thick bead of gasketmaker on the front and rear of the block, then i layed the lower intake on. After i was done with the job, i could hear a small vacuum leak, but couldnt find it, even with carb cleaner. i could tell it was around the PCV area. and now theres a puddle of oil leaking at the rear of the block were it meets the intake. Do u guys think thats where my vacuum leak is and is that leak enough to make my car idle like crap?

White Thunder · June 6th, 2009, 09:53 PM

yeah thats why idel sucks....you cant see where the oil is coming.....get you some fel pro gaskets

1fst5.0 · June 7th, 2009, 12:08 AM

what kind of RTV should i use? i just took it apart and the gasketmaker didnt bond with the lower intake, just the block. i used some grey RTV this last time.

superbean · June 7th, 2009, 12:38 AM

intake valley seals suck...

1slo5.0 · June 7th, 2009, 07:37 PM

Originally Posted by 1fst5.0

Whats up fellas, i need ur guys help again.I recently had to remove my upper and lower intake. when i was putting it all back, i layed a thick bead of gasketmaker on the front and rear of the block, then i layed the lower intake on. After i was done with the job, i could hear a small vacuum leak, but couldnt find it, even with carb cleaner. i could tell it was around the PCV area. and now theres a puddle of oil leaking at the rear of the block were it meets the intake. Do u guys think thats where my vacuum leak is and is that leak enough to make my car idle like crap?

Yep, that is your vacuum leak. The pcv draws from the lifter valley. If you don't have a good seal there you will have a vacuum leak.

kaeo1981 · December 14th, 2009, 06:46 AM

Not Sure If This Might Help B/c I Am New To Mustang Motor Building Myself, However, I Used Both Felpro Gaskets And Rtv Gasket Maker And It Sealed The Crap Out Of It. Give That A Shot. Seemed To Work Well For Me. If Anyone Thinks This May Be A Bad Deal Then Please Let Me Know. Like I Said, Im New To This Myself.

flyin ryan · December 14th, 2009, 08:19 AM

I use nothing but permatex gasket maker... thick bead around everything and have never had a problem with this except when I have to yank the lower for what ever reasons..

93hatch · December 14th, 2009, 01:13 PM

can of the right stuff ftmfw

White Thunder · December 14th, 2009, 06:51 PM

lol this old ass thread....

kaeo1981 · December 28th, 2009, 07:19 AM

Not sure if you got your leak fixed yet (hopefully you did), however, I agree with 1slo5.0, the pcv leak will def cause a major leak. thought mine was secure and when i took it for a test drive thru my neighborhood the damn thing blew out and oil was spurting all over my windshield (didn't have hood on). truth be told, it was freakin hilarious. not hard to fix tho. good luck....

electricblue87 · December 28th, 2009, 10:32 PM

I Agree Most Likeley The Pcv Leaking.however There Is All Those Tiny Brittle Ass Mini Vacume Lines That Break Any Time You Breath On Them Too.that Can Also Cause Vacume Leakage

June 6th, 2009, 06:23 PM	#1
1fst5.0 Regular 1986 mustang gt Join Date: Apr 2009 Location: el paso tx Posts: 189 iTrader: 0 reviews	Vacuum leak?..... Whats up fellas, i need ur guys help again.I recently had to remove my upper and lower intake. when i was putting it all back, i layed a thick bead of gasketmaker on the front and rear of the block, then i layed the lower intake on. After i was done with the job, i could hear a small vacuum leak, but couldnt find it, even with carb cleaner. i could tell it was around the PCV area. and now theres a puddle of oil leaking at the rear of the block were it meets the intake. Do u guys think thats where my vacuum leak is and is that leak enough to make my car idle like crap?

June 7th, 2009, 12:38 AM	#4
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	intake valley seals suck... __________________ weeee foooord!

December 14th, 2009, 01:13 PM	#8
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	can of the right stuff ftmfw __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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June 7th, 2009, 12:08 AM	#3
1fst5.0 Regular 1986 mustang gt Join Date: Apr 2009 Location: el paso tx Posts: 189 iTrader: 0 reviews	what kind of RTV should i use? i just took it apart and the gasketmaker didnt bond with the lower intake, just the block. i used some grey RTV this last time.

December 14th, 2009, 06:46 AM	#6
kaeo1981 Newbie 1991 MUSTANG GT Join Date: Dec 2009 Location: BAMA Posts: 2 iTrader: 0 reviews	Not Sure If This Might Help B/c I Am New To Mustang Motor Building Myself, However, I Used Both Felpro Gaskets And Rtv Gasket Maker And It Sealed The Crap Out Of It. Give That A Shot. Seemed To Work Well For Me. If Anyone Thinks This May Be A Bad Deal Then Please Let Me Know. Like I Said, Im New To This Myself.

December 14th, 2009, 08:19 AM	#7
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	I use nothing but permatex gasket maker... thick bead around everything and have never had a problem with this except when I have to yank the lower for what ever reasons..

December 28th, 2009, 07:19 AM	#10
kaeo1981 Newbie 1991 MUSTANG GT Join Date: Dec 2009 Location: BAMA Posts: 2 iTrader: 0 reviews	Not sure if you got your leak fixed yet (hopefully you did), however, I agree with 1slo5.0, the pcv leak will def cause a major leak. thought mine was secure and when i took it for a test drive thru my neighborhood the damn thing blew out and oil was spurting all over my windshield (didn't have hood on). truth be told, it was freakin hilarious. not hard to fix tho. good luck....

December 28th, 2009, 10:32 PM	#11
electricblue87 Newbie 87 MUSTANG GT 12.87@107 Join Date: Dec 2009 Location: NEW YORK Posts: 42 iTrader: 0 reviews	I Agree Most Likeley The Pcv Leaking.however There Is All Those Tiny Brittle Ass Mini Vacume Lines That Break Any Time You Breath On Them Too.that Can Also Cause Vacume Leakage

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