Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

Sponsored by:

vacuum leak???

Reply Subscribe

Search this Thread

Old

Dec 27, 2010 | 05:30 PM

#1

Thread Starter

Junior Member

Joined: Jul 2002

Posts: 32

Likes: 0

vacuum leak???

Hey guys I just bought a 86 firebird with a rebuilt 305 edelbrock intake and carb and I'm only pulling 10 inches of vacuum at around 700 rpm. I can't for the life of me find any leaks either. Any ideas?

Old

Dec 27, 2010 | 05:43 PM

#2

Moderator

Joined: Jan 2000

Posts: 20,981

Likes: 11

From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: vacuum leak???

Have you set your timing and idle mixture?

Old

Dec 27, 2010 | 06:40 PM

#3

Thread Starter

Junior Member

Joined: Jul 2002

Posts: 32

Likes: 0

Re: vacuum leak???

Quote:

Originally Posted by Apeiron

Have you set your timing and idle mixture?

Timing is set to 36 total advance and I have set idle mixture numerous times trying to get more vacuum.

Old

Dec 27, 2010 | 06:53 PM

#4

Moderator

Joined: Jan 2000

Posts: 20,981

Likes: 11

From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Re: vacuum leak???

How much advance at idle? What are your cam specs?

Old

Dec 27, 2010 | 07:05 PM

#5

Thread Starter

Junior Member

Joined: Jul 2002

Posts: 32

Likes: 0

Re: vacuum leak???

Quote:

Originally Posted by Apeiron

How much advance at idle? What are your cam specs?

I'm not sure of the actual cam specs I was told I have a mild cam in it And advance is about 12 or 13 degrees at idle

Old

Dec 27, 2010 | 10:14 PM

#6

Thread Starter

Junior Member

Joined: Jul 2002

Posts: 32

Likes: 0

Re: vacuum leak???

I mean it would have to be a pretty decent sized cam for that kind of idle vacuum right?

Reply Subscribe

Related Topics

Thread

Thread Starter

Forum

Replies

Last Post

Was I too Optimistic ? TPI L98 Power

FormulasOnly

TPI

95

Jul 23, 2018 08:47 AM

idle surge in park and nuetral only?

bbsr72

TPI

3

Apr 2, 2016 09:12 AM

[CA] 1989 Trans Am w/ just 32k miles for sale

jrdturbo

Firebirds for Sale

26

Mar 31, 2016 02:58 PM

86 2.8 v6 .. stalls when gas is pressed

86maro_252

Tech / General Engine

6

Oct 10, 2015 06:52 PM

Qjet dies from a high idle

ndndndnd

Carburetors

2

Sep 16, 2015 04:13 PM

1406, 1984, 383, carb, edelbrock, find, firebird, intake, leak, leaks, manifold, pontiac, sbc, vacumm, vacuum

First
Prev
1 / 1
Next
Last

All times are GMT -5. The time now is 04:40 AM.