Carb Question

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Apr 12, 2007 | 08:02 PM

#16

71LTD390

Thread Starter

Tuned

Joined: Aug 2003

Posts: 346

Likes: 0

From: Eastern Virginia

Oh, and does anyone know the correct "wet" float adjustment for the '78 400 engine? Mine is classed as "heavy duty" on the valve cover decal if this makes any difference.

Apr 13, 2007 | 03:04 AM

#17

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

Likes: 778

From: Simi Valley, CA

Quote:

Originally Posted by 71LTD390

1. Choke pull-off leaking bad. Real bad. Would not even attempt to hold vacuum.

2. Air cleaner duct motor leaking

Only other "leak" I could find was that the Vacuum Amplifier leaks vacuum when vacuum is applied to the port going to the EGR valve. The vacuum leaks from an unused port on the amplifier. Is this a vent? That's my guess.

I still have a slight hesitation that occurs a second after I accelerate during cruise. I think it is the EGR kicking in....but I guess this is normal.

If anyone can tell me if the amplifier leak is normal I would appreciate it. Thanks for all of your help.

D8AZ-9S514-A .. Choke "Pull Off" (Motorcraft CX-2057)

D7TZ-9D612-A .. Air Cleaner Duct Motor (Motorcraft CX-106)

Sorry, can't help on vacuum leaks, I'm just an insane parts dummy.

Apr 13, 2007 | 07:39 PM

#18

71LTD390

Thread Starter

Tuned

Joined: Aug 2003

Posts: 346

Likes: 0

From: Eastern Virginia

Thanks Numberdummy! Ordered the pull-off through Advance. Will be here in AM. Would like to find a Motorcraft Duct Motor. Looks more original.

Apr 13, 2007 | 08:04 PM

#19

Mil1ion

New User

Joined: Jan 2008

Posts: 0

Likes: 24

See that link in post #2 I made

If you looked the bottom of the directory list on the right side you would have seen the specification and adjustments page shown here.

Figure #4

http://www.autozone.com/az/cds/en_us...rInfoPages.htm