1985 720 Throttle stuck wide open

[Charlie69]

I know nothing about these TBI setups.  I was going to use this in one of my 720, but have changed my mind and will goo KA when the time comes.

[1985 4x4]

Thank you I will pm ya

[1985 4x4]

ok it's Wednesday already, I have had only 1 lead on another carb for my 85 4x4 , I am borrowing a vw bug until Friday, looks to be a broken return spring and it it sounds like there are not many of these carbs laying around, Any leads would be great.

 

 Thank You for all the views and insight so far with my truck. A weber conversion might be coming 

[Lockleaf]

You need to stop referring to it as a carb. It is a throttle body. Calling it by the wrong will continue to confuse the issue.

 

If the only thing wrong is a spring, why dont you just find a spring that does the job. Doesn't matter if it's Nissans part or not.

 

Also,that throttle body can be found on any 4 cylinder pathfinder or hardbody truck up through 1989.

[Sealik]

Where is the spring broken????? On the end????

Pull the trunnion off and have a better look.......bend a 90+ degree on the end of the spring and hook it back up. who cares if there is a little more tension.

 

Or......as a temp fix just get a long spring and hook it up to the trunnion and or, (closer to the throttle body the better) until you can find the correct one.

[1985 4x4]

Thank you Lockleaf for the information about the correct term, I will remove the trunion and will try the spring fix this evening.

[Rick-rat]

  Is it fixed yet?

[1985 4x4]

nope not fixed, haven't found another throttle body for one, the local shop wanted almost as much as a weber conversion...I really am waiting now to see if I can come up with something. Throttle body stuff. I will learn how to fix it sooner or later then never have the problem again. The more I learn on my truck though the better off I will be. Don't ever plan on selling it. I am sure the talented mechanical guys on here get frustrated with newer guys like me ...it is what it is though I appreciate the help I have gotten

 

plan on messing with it more tomorrow afternoon

[Charlie69]

Check this out.  I would contact them and get some better pictures to see if one might interchange with what you have.

 

http://www.oem-surplus.com/nwp/truck-1.htm

[1985 4x4]

no luck with oem  (link above) they had some cool stuff though

 

but thank you for the lead  Charlie69  Still on the hunt for this

[Charlie69]

If you ask them for one like yours they will say they do not have it.  Get the one closest to your for parts or install the new one and see how it runs.  A Z24 is a Z24.

[wayno]

Think outside the box here, make your own throttle return, I know mine is a Weber, but you can likely do the same thing, unless I am missing something.

 

 

[Doctor510]

Go back to basics.  Remove the throttle cable and start the motor.  Move the throttle by hand, you may be surprised.

[1985 4x4]

yes the basics ,took a week off from the truck since the frustration of a simple thing is killing me, tried several springs at different points to help with the pivot. Seems to have snapped then it over clocked when it snapped back. I will update you guys over the weekend might just swap it for a weber set up for now. 

[1985 4x4]

Starting the Weber switch over today, of course it will create more questions. So if someone can send me a link I was unable to find it on the site about how to fix the fuel pressure problem and there was another issue that pops up for a 85 with EFI  thanks

[datzenmike]

Weber conversion??? Got to be easier to get a return spring from any other Z24i or VG30i 720 or D21 Hardbody. It's just a spring.

 

First you fuel pressure is too high. You need another fuel pump with about 3PSI output

The intake will need an home made adapter or an earlier Z24 carb manifold that will take a weber.

The Z24i distributor isn't, it's actually a crank angle sensor (CAS) and needs the EFI to generate a timed pulse for the coil. You will need an earlier Z24 distributor.

[1985 4x4]

So I will look tomorrow at the local junk yard for the distributor,the fuel pump I will buy new. I will start the hunt any suggestions for the fuel pump ?

[Charlie69]

This is what I use When I do not have a used factory pump.

 

http://www.ebay.com/itm/181567996203?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[Rick-rat]

 

 

I wish I had the spring he needs, being it is so rare, should be worth BIG money

[datzenmike]

ha ha

[1985 4x4]

Yes thats what is not funny about this tried several different ways with return springs there is something else going on. I love my truck but I have to get her going...frustrating and I wish I had more mechanical expertise. I joined this site for help and I also drive mine daily and at times I feel like crap because of some of the comments made..I just cannot do what others do and know,maybe someday I will be able to help others here and pay it forward.

I thank everyone for the help

[datzenmike]

There has to be one lots of these in a wrecking yard somewhere. The spring can't be $5

[Charlie69]

1985 4x4 we all started somewhere with our learning also.  I have been working on and owning Datsun & Nissan trucks since the 70s.  I do not know much at all about these throttle body injection engines, but I do want to learn. 

 

I will read through the Electronic Injection Factory Service Manual I have and see if it has any mention of your problem.  I am sorry I did not think of this sooner.  When I have the time I will copy this rare manual and save it in PDF form and post it on the web for any that might need it.

[84720FourWheel]

The hardbodies and pathfinders up thru 1989 have the same throttle body.

 

I'll pull my air cleaner off of my Pathfinder tomorrow and get some pics for the setup. It has a torsional spring for the return IIRC... So you may want to make sure the ends are seated properly.

 

Here's a link on the components.

 

http://www.nissanpathfinders.net/forum/topic/23251-tbi-component-listing-loctaions/?do=findComment&comment=765960

[1985 4x4]

Thanks again for the links...great information