Did intake gaskets, now I've got REAL problems!

Reply Subscribe

Thread Tools

Search this Thread

Sep 18, 2011 | 05:18 PM

87camaroPOS

Thread Starter

Junior Member

Joined: Oct 2006

Posts: 45

Likes: 0

From: North Carolina

Car: 1987 IROC-Z

Engine: 5.7 TPI

Transmission: 700r4

Did intake gaskets, now I've got REAL problems!

I've got an 87 IROC 5.7l TPI I just did the intake manifold gaskets on. Now the car fires right up on the first crank but it runs like s***, and I can hear a sound like I've got a massive vacuum leak but I can't find it! Besides the 4 or 5 outlets on the plenum and the pcv fitting on the manifold where could the vacuum be coming from?

Also what do you guys have your timing set to?

Sep 18, 2011 | 05:58 PM

shortyskater

Member

Joined: Jul 2010

Posts: 314

Likes: 1

From: pembroke ma

Car: 1987 Chevy Camaro Iroc-Z

Engine: just an empty hole. LS1 coming soon

Transmission: nothing there either. T-56 soon!

Axle/Gears: soon Moser 9 bolt

Re: Did intake gaskets, now I've got REAL problems!

I would go back over every hose and the plenum again. Just move slowly. Another trick you could try is spraying some soapy water along the plenum. Any air leaks will show up as bubbles. Worth a shot.

Sep 18, 2011 | 11:25 PM

skibum2100

Member

Joined: May 2010

Posts: 259

Likes: 0

From: Boulder Colorado

Car: 1988 GTA

Engine: 5.7 TPI w/ Bosch III's

Transmission: T56

Axle/Gears: 3.27 Borg Warner 9 bolt

Re: Did intake gaskets, now I've got REAL problems!

You could also spray starting fluid or carb cleaner over and around the plenum and runners, to locate a vacuum leak. The rpms will increase noticeably if you spray over a vacuum leak. Probably the plenum or runner gaskets are leaking.

Check the cold start injector. I accidentally installed mine at some funny angle, tweaked the mounting bracket, and caused a huge vacuum leak.

Hope this helps.

Last edited by skibum2100; Sep 19, 2011 at 05:40 PM.