1979 280zx Deceleration Problems - ZDriver.com

280ZX (S130) Forums Dedicated to 79-83 ZCars

LinkBack Thread Tools Search this Thread
Old 03-22-2016, 11:36 AM   #1  
Registered User
Thread Starter
Join Date: Mar 2016
Posts: 2
1979 280zx Deceleration Problems

Hi guys! First post here.
I got my 1979 280zx a while ago, and have been giving it the maintenance it deserves. I fixed a lot of stuff that was wrong with her already, and the only thing that I have left to figure out how to fix is this:

When I decelerate quickly, the motor has a hard time holding the idle. Let's say you have it in neutral and want to rev it to impress your friends. The revs go way below 1000 when you let off the gas, and sometimes the motor stops. It has a hard time going back to idle. Reading for a while, and inspecting around the engine bay, I found a vacuum port without anything attached to it, just below the throttle body. I think this has to go to the canister (the canister was missing the vacuum line as well) and it's the boost controlled deceleration device vacuum port. The canister also has another port, that goes to the distributor, but I didn't find any vacuum ports on my distributor to connect it there. So, do you guys think is there a way to make it work without these vacuum lines? Should I get a new distributor with this vacuum port on it? I already connected the throttle body port where it should be, according to the canister (it has a sticker that says so), but I have another port without anything attached to it, and the canister says it has to go to the distributor. Thoughts? Any help is appreciated a lot!
tavomeister is offline   Reply With Quote
Old 03-22-2016, 08:17 PM   #2  
Registered User
kraztrini's Avatar
Join Date: Mar 2006
Posts: 22
Thumbs up Boost Controlled Deceleration Device

I also own a '79. I will check on the vacuum hose flow and get back to you
kraztrini is offline   Reply With Quote
Old 03-23-2016, 06:28 AM   #3  
Registered User
Thread Starter
Join Date: Mar 2016
Posts: 2
Thank you very much!
tavomeister is offline   Reply With Quote
Old 03-24-2016, 11:14 AM   #4  
The Good Twin
NismoPick's Avatar
Join Date: Aug 2005
Location: Wild Wild West, UTAH!
Posts: 20,609
Welcome to ZDriver!

The FSM has many helpful vacuum diagrams: XenonZcar.com S130 Factory Service manuals
NismoPick is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Deceleration and shutting down engine on 1972 240z jalexquijano 240Z, 260Z, 280Z Performance / Technical 7 10-21-2014 08:41 AM
300zx tt smokes on deceleration craftm 300ZX (Z32) Performance / Technical 35 04-17-2008 12:57 PM
problems problems problems LuVmY280 280ZX Performance / Technical 8 07-18-2007 06:01 AM
deceleration oil smoking goldenstoomuch 240Z, 260Z, 280Z (S30) Forums 1 07-01-2003 05:46 PM
1979 280zx electrical puzzle vltjr 240Z, 260Z, 280Z (S30) Forums 3 04-03-2002 10:20 PM


280zx, bcdd, canister, deceleration, distributor

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -7. The time now is 12:11 AM.

© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.