73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: JJSZABO on June 28, 2007, 09:37:35 am

Title: Q-Jet Question
Post by: JJSZABO on June 28, 2007, 09:37:35 am

Sorry if this was asked before, but I am going to throw it out again.  Please look at the following pictures and let me know where the vacuum lines go.  I have a Q-jet M4ME on a 350.  Its for a 1986 C-10.  I will be hooking up the EGR valve and vacuum canister with Cats.

Thanks for your input.

(http://i123.photobucket.com/albums/o317/jjsabol/IM0010871.jpg)

(http://i123.photobucket.com/albums/o317/jjsabol/IM0010861.jpg)

Thanks for the help.

Jeff

Title: Re: Q-Jet Question
Post by: VileZambonie on June 28, 2007, 03:45:24 pm

You can cap all the ones you don't need. Yes the bottom biggie goes to your PCV valce. The large vent goes to your cannister. You can put either the lower front port or mid (ported) port to your vacuum advance on your distributor. Basically put it to whichever one gives you the better desired idle quality based on your engine combinations. The ported vacuum port is located above the throttle plate so it only gets a vacuum signal when the throttle opens. You can use this one for your EGR

Title: Re: Q-Jet Question
Post by: yttaf on June 28, 2007, 06:48:41 pm

what is the nipple in the back by where the brake booster screws in?

Title: Re: Q-Jet Question
Post by: JJSZABO on June 28, 2007, 06:52:57 pm

Thanks Vile - that's exactlly what I was looking for.

Jeff

Title: Re: Q-Jet Question
Post by: JJSZABO on June 28, 2007, 07:13:38 pm

Here is how I plan on running my lines (they correspond with the marking on my Q-Jet - but not in order):

(http://i123.photobucket.com/albums/o317/jjsabol/scan0001-1.jpg)


What do you think?

Jeff

Title: Re: Q-Jet Question
Post by: VileZambonie on June 28, 2007, 09:23:36 pm

Should work just fine like that and will be neat if you route everything nice. If you are going to run a TVSV you should put it out of site near the back of trhe engine if your intake has a rear port. Those things are ugly

Title: Re: Q-Jet Question
Post by: JJSZABO on June 29, 2007, 07:21:21 am

I agree - but unfortunately I do not have a rear water port.  I have two in the front that is shown with the brass plugs.  I plan on using the one on the right.  I was planning on running steel lines for vacuum and use rubber as line unions (if you know what I mean) - to keep things looking "clean".

Thanks for your help.   ;D

Jeff