help for my 86 4x4

[bulldawgs86]

I am new to the group I have a 1986 nissan 720 4x4, love this thing. I just put a new weber 34/34 on and got rid of all the 800 vac lines. However after i run around town and shut it of it never wants to start again it seems to flood out or starve have not figured out which yet, if it does start the idle is iratic and then stalls out. called weber and since i live at 4600 feet they are sending me new jets, any ideas if this will solve my problem?

[PEZi]

it might help... but my 38 DGES runs fine and starts up just perfectly whenever

do you have a psi gauge? make sure you're getting fuel to the carb

[bulldawgs86]

yep had it tested and its a little over 3.5 lbs, it runs great when i start it and drive it but if i shut it down like to run into the store and come back out to start it it wont idle and then shuts off, fuel filter is good, pump is good vacuum is good. I am having the jets re done in the am (4600 ft), about the only other thing i have researched is that i have a return fuel line and some suggested I remove the return line or block it, but i am new to nissans(toyota was my old truck) and dont know if i can or not.

I want to post some pics but dont see how i can

[flinterman2000]

How is the fuel consumption. If she's flooding out it may need a better spark plug and some adjustment. The jets wont help with non starting. The air screw may also need attention. You will need to keep adjusting like forever until the problem stops.

[bulldawgs86]

fuel consuption is good not to bad, i am going to have it re jetted and see what happens, i was told again on another site to seal off the fuel return line any info on that

[PEZi]

i sealed mine off...

[bulldawgs86]

thanks I will do that and post the outcome.

[flinterman2000]

Mine never had a return.

[bulldawgs86]

MIne had one, so I just bought a new fuel line and where the return and the inlet line meet I just capped it off.

could not get it jetted yesterday because the carb mech was sick so it will be next week. will keep evryone posted on the out come,

thanks for all the response I like this forum, lot of folks who have had the same issues and getting good responses.

[bulldawgs86]

ok so been reading more and more about my Nissan and this is the score so far.

I put on a weber 34/34 installed fuel preasure gauge, new 3.5 micro fuel pump, plugged the return line, plugged all my vac lines off, all new plugs, had the carb re jetted for higher elevations. my problem still persist. truck runs great till i shut it off and run into the store for something then it doesnt want to restart.

Since I am new to Nissans (always had jeeps and sammy's) i read a post that i truly only need 1 vac line and that is the line that goes from my carb to the dis vacuume advance is this correct. sorry folks but this truck has me stumped as to why i have this issue. does anyone have a pic of how they have ran their vac lines back to the canister etc.

[mdjett]

This sounds a lot like vapor lock. Does the engine start just fine if you let it sit for 20 minutes or so?

My old BMW 2002 loved to do this with a 32/36 until I rerouted the fuel lines. In the 2002, the fuel line came across the top of the head (it originally had a cam driven mechanical pump), so when the engine sits and heat soaks, it would get nasty vapor lock. The only vacuum line on it was the vacuum advance to the dizzy. How are you fuel lines routed? Any chance that's happening? It would be a lot harder to do in a Z-engined 720, since the fuel comes in on the intake side and never crosses the block/goes by the exhaust, but you never know...

[flinterman2000]

The fuel pump is it electric. Sound like too much fuel after you shut down. Check to see if the pump runs when its switched off. Check the fuel level also before trying to start after a run.

[bulldawgs86]

ok well put the jets in and now the truck won't start put a new battery and starter in ( had spares from prev. owner) and still just clicks, checked all the fuses under the driver side panel and found that the computer fuse was blown put a new on in still the same just clicks. anyone ever have this issue.

May turn this thing into a parts truck or just junk it and call it a loss.

[flinterman2000]

Remove the wire from the soleonoid and try a direct from the battery. If it still clicks, slacken the starter not too mkuch and try it again. The starter should move a little then turn the engine over. It coulod be that this starter is too close to the ring gear and is locking on it, or has the wrong bendix ( too much teeth on the gear).

[dogred]

Take the starter to the local parts store they can test it for free. Does everything else electrically work? Could be bad negative wire. Check the resistance of the positive wire from one end to the other, then do the same for the negative. They would have to be diconnected from evrything to get an accurate reading. Should be very low, less than 200 ohms.

[bulldawgs86]

Update so I took my starter to the parts house and it was good, talked to a few other folks and was told that on the back of the ignition switch there is an electrical piece that sometimes goes bad and also on 4x4 models there is an ignition relay on the left passenger side fender, I was told they go bad . So here is what I did I ordered both components and will install them on thursday, I rejeted the carb myself . I will charge the battery and hopefully by Thursday my beast will be alive again but we shall see. I also found a ECU for it for 100 bones just in case, since the fuse to the cumputer was blown I figured I'd call and find one just in case and also found a replacement engine for it just in case hopefully I wont have to get that drastic but we will see.

Any ideas please jump in a feel free to help LOL

[flinterman2000]

Looks like you covered it all.

[dogred]

Just an idea but there was a high elevation model listed in my service manual, all the parts pertained to the fuel system.

I do not know since all your mods have been done if it still pertains to your ride.

The problem is most definately in your fuel system, since the 720's had an early version of an evap fuel system. Can you post a pic of the fuel vapor canistor on the front driver side, by the ignition coils? I will have to look in my manual if you are interestd in the info.

[bulldawgs86]

ok well Im back online, here is where it stands at this point. I found my starting issue, it was one of my coils that was hosed up and also the fuse for the computer, got the truck started and was running great.

won't drive worth a crap. instead of going to weberdirect.com I called weber and for my altitude they do not recomend the 34/34 and it is not a weber carb it is a solaris carb with a weber sticker. weber recomended the 32/36 so I found the 32/36 from redline and ordered a high altitude kit for it. the folks at weber (not weber direct.com) said that on the 720 either a 32/36 or the 38 are the best options.

I have a weber 34/34 cheap(100.00) plus shipping if anyone at a lower sea level wants one.

so I will keep everyone posted as to how it turns out, also I wanted to post some pics out of my toy so does anyone know how to post pics on the site?

thanks everyone for the help it is much appreciated. Im sure I will be back on with more issues LOL.

[flinterman2000]

Tinypic.com or photobucket.com. Load the pictures, copy the link and paste to your post.