Pennock's Fiero Forum
  Technical Discussion & Questions
  Lower intake question

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Lower intake question by Lilchief
Started on: 11-08-2013 02:02 PM
Replies: 8 (251 views)
Last post by: Francis T on 11-12-2013 01:18 PM
Lilchief
Member
Posts: 1689
From: Vevay,Indiana
Registered: Feb 2004


Feedback score: (3)
Leave feedback

Rate this member

Report this Post11-08-2013 02:02 PM Click Here to See the Profile for LilchiefSend a Private Message to LilchiefEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'm curious about the tube that runs from the upper intake neck to the lower intake. How does it tie into the runners, just one or all of them ? The reason I'm asking is I have a trueleo intake and had it plugged, well the plug rotted and created a big leak but it ran alot better at WOT. Almost broke the slicks(drag radials) loose when it hit 2nd gear.

------------------

85 GT 3.4
14.9 @ 90 1.9 60' Old TH125/3.06
Unknown New 4T60/3.42

IP: Logged
PFF
System Bot
carbon
Member
Posts: 4767
From: Eagan, MN
Registered: Apr 2004


Feedback score: (2)
Leave feedback





Total ratings: 133
Rate this member

Report this Post11-08-2013 02:16 PM Click Here to See the Profile for carbonSend a Private Message to carbonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Vacuum leaks aren't as big of a deal at high RPM... if a big vacuum leak gave you more power up top, fix your tune...

I am pretty sure it is just a hole drilled all the way down the center of the lower intake to provide IAC air... I don't think they'd leave the cylinders unbalanced.
IP: Logged
Lou6t4gto
Member
Posts: 8421
From: Ocala, FL USA
Registered: May 2008


Feedback score:    (7)
Leave feedback

Rate this member

Report this Post11-08-2013 02:17 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
are you asking about the EGR TUBE ? or a rubber line ?
IP: Logged
Raydar
Member
Posts: 38343
From: Carrollton GA. Out in the... country.
Registered: Oct 1999


Feedback score:    (11)
Leave feedback





Total ratings: 451
Rate this member

Report this Post11-08-2013 03:08 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
That's the idle air tube. There's supposed to be an L shaped tube from the back of the TB to the fitting on the lower intake.
The fitting just opens into the front of the lower intake, IIRC.
IP: Logged
Blacktree
Member
Posts: 20298
From: Central Florida
Registered: Dec 2001


Feedback score:    (11)
Leave feedback





Total ratings: 349
Rate this member

Report this Post11-08-2013 03:25 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
The idle air passage in the lower intake branches out to each intake port. The cold-start injector also squirts fuel through those same passages.

edit to add: If you get better WOT performance with a vacuum leak, then your tune is probably too rich at WOT.

[This message has been edited by Blacktree (edited 11-08-2013).]

IP: Logged
Lilchief
Member
Posts: 1689
From: Vevay,Indiana
Registered: Feb 2004


Feedback score: (3)
Leave feedback

Rate this member

Report this Post11-08-2013 04:20 PM Click Here to See the Profile for LilchiefSend a Private Message to LilchiefEdit/Delete MessageReply w/QuoteDirect Link to This Post
It's the rubber tube. The AIT and TPS were both bad also, so there's one rich problem. This is with a GN 59mm TB, guess it could still use more air.
IP: Logged
Raydar
Member
Posts: 38343
From: Carrollton GA. Out in the... country.
Registered: Oct 1999


Feedback score:    (11)
Leave feedback





Total ratings: 451
Rate this member

Report this Post11-08-2013 06:28 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Blacktree:

The idle air passage in the lower intake branches out to each intake port. The cold-start injector also squirts fuel through those same passages.
...


Thanks. Been a long time since I looked at a stock lower.
IP: Logged
carbon
Member
Posts: 4767
From: Eagan, MN
Registered: Apr 2004


Feedback score: (2)
Leave feedback





Total ratings: 133
Rate this member

Report this Post11-11-2013 01:34 PM Click Here to See the Profile for carbonSend a Private Message to carbonEdit/Delete MessageReply w/QuoteDirect Link to This Post
Does everybody have me on 'ignore' or something?


IP: Logged
Francis T
Member
Posts: 6620
From: spotsylvania va. usa
Registered: Oct 2003


Feedback score: (1)
Leave feedback





Total ratings: 119
Rate this member

Report this Post11-12-2013 01:18 PM Click Here to See the Profile for Francis TClick Here to visit Francis T's HomePageClick Here to Email Francis TSend a Private Message to Francis TEdit/Delete MessageReply w/QuoteDirect Link to This Post
That small line goes to fuel reg under the plenum. Send me an e-mail and Ill send you vacuum line layout drawing. rspiderii@aol.com

------------------
http://i16.photobucket.com/...ancis44/100_1147.jpg
[/URL]
[IMG]http://i16.photobucket.com/albums/b50/francis4
4/000_0451-1.jpg[/IMG]
trueleo.com
RSpiderII@aol.com

IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock