Duratec Vacuum Manifold Distribution Box Question - Taurus Car Club of America : Ford Taurus Forum
 
LinkBack Thread Tools
post #1 of 3 (permalink) Old 11-05-2015, 09:50 AM Thread Starter
Junior Member
 
Join Date: Jul 2013
Chapter: Southeast
Posts: 56
Rep Power: 13
 
Trader Score: 0 reviews
Duratec Vacuum Manifold Distribution Box Question

I noticed that the black vacuum distribution box is connected to the large flexible intake hose just before the throttle and also to the intake manifold just after the throttle. There is a lot of vacuum present on the prethrottle hose. It seems like this is causing a lot of air to bypass the throttle. Is this normal? Is a lot of air just supposed to flow from the "accordion" through the vac distribution box and into the intake manifold bypassing the throttle?
cepflight is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 11-05-2015, 11:41 AM
Crazy Devoted Member
 
Join Date: May 2011
Location: NY State
Chapter: Northeast
Year: 2003
Model: Mercury Sable
Engine: 3.0L 24v Duratec V6
Posts: 9,560
Rep Power: 99
      
Garage
Trader Score: 0 reviews
Quote:
Originally Posted by cepflight View Post
I noticed that the black vacuum distribution box is connected to the large flexible intake hose just before the throttle and also to the intake manifold just after the throttle. There is a lot of vacuum present on the prethrottle hose. It seems like this is causing a lot of air to bypass the throttle. Is this normal? Is a lot of air just supposed to flow from the "accordion" through the vac distribution box and into the intake manifold bypassing the throttle?
Normal!

Small low flow clean, metered flow of air passes through the box and back into the intake. Actual flow is small, but still attached to intake vacuum. Tiny flow compared to the PCV which is supposed to be significant flow.
Assuming the PCV is working as designed, and OEM design, not some afermarket cheap thing.
As long as all the air into the intake is 'metered' and 'filtered' all is per design.

-chart-
chartmaker is offline  
post #3 of 3 (permalink) Old 11-05-2015, 12:37 PM Thread Starter
Junior Member
 
Join Date: Jul 2013
Chapter: Southeast
Posts: 56
Rep Power: 13
 
Trader Score: 0 reviews
I only replace parts on the Taurus with Motorcraft parts.

That hose to the distribution box is pulling a lot more air when the engine is at idle than the crankcase breather hoses that are part of the PCV system. Are you saying that hose should have even less vacuum than the breather hoses? Is the box just a box with a bunch of hoses that connect to it or does it have some kind of valve that moves inside? It would seem as though even if it is metered air, bypassing the IAC solenoid and the throttle would make it difficult for the IAC solenoid to do its job. But if that's the original design, and the box isn't supposed to restrict the flow, then that's cool I guess.

I'm not experiening high idle, and my LTFTs are only slightly elevated but less than 3%. I actually got the P0171, and P0174 warnings for lean mix the other day. I replaced the hose from the PCV valve to the IM (which I did previously 5 years ago) and the PCV valve itself while I had the hose off (which I replaced 2 years ago), (all parts Motorcraft), I cleared the DTCs and the PCM hasn't stored any codes since I did this (several days, several drive cycles, and over 200 miles). However it does seem to idle a bit rough and the RPMs dip close to around 500 at times and I'm trying to figure out why.

I had the dealership replace my harmonic balancer a few months ago because I just didn't have the time. I also had them replace the front seal while they had the balancer off. I'm wondering if the rough idle is from something they did, me being paranoid thay they messed up and noticing things I didn't notice before, or just that the car is getting old and engine parts are getting worn (193K).
cepflight is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Duratec 1996 vacuum leak, won't idle. JulesCharles Maintenance and Repair 17 10-19-2017 08:35 PM
Vacuum hose question japakar Maintenance and Repair 2 10-12-2015 07:30 PM
Write Up: Gen 4 Duratec UIM/LIM Removal/Installation Sam Solutions to Common Problems and 'How To' Articles 20 07-11-2015 03:48 PM
A Decade of the Duratec 30 DanB Taurus and Sable General Discussion 0 09-12-2014 07:16 PM
P1132 and P1152 and MIL after correcting vacuum leaks 2002 Duratec bighank Maintenance and Repair 5 08-08-2013 10:52 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome