idling problem

[sawyer's720]

disreguard that last post.
california, z24 1984 standard is DFP384-3, heavy duty is DFP384-12 and 4wheel drive is DFP383-3. no where in my book does it say anything about air conditioning/transmission used. only later models are listed as that being a factor.

the rebuild kit i bought from napa covers DCH340; DCR342,384; DFP384. idk if that will help or not but thats my .02

[cedar]

awesome thanks a ton sawyer's720
saves me some time hopefully. its gotta be the DFP383-3

[MetalFab]

I've capped all my lines and ran into issues since, the idle varies from 500ish rpm to 3k rpm, I've checked for vac leaks-emptied a few cans of carb cleaner in the engine bay without a stutter.

An old cam grinder I take classes with at college tested my vac line to the dizzy and says it's supposed to hold vac against your tongue--and mine doesn't. So I suppose I'll be posting another topic to see if I can change the vacume internals on the dizzy although I've yet to look at the book.

[fastboatman29212]

My truck has the same issue with idling. Most of the time it idles high, usually when the engine is warm. It usually idles about normal when it's cold, but it can change almost anytime it wants to. I know it's not a vacuum leak, (new vacuum lines and tested with carb cleaner same as you did). I've been blaming the carb itself because the choke flap stays all the way open ALL the time. I inspected and found a broken linkage between it and the ????? (I don't know the name of it but it's on the back DS corner of the carb). I bought another carb at the salvage yard hoping to use it for parts or as a replacement but I haven't done anything with it yet. I will post photos of what I'm talking about later. (In fact, I plan to post detailed photos of every part of the carb for future reference. That way people on this forum can communicate more clearly about carb parts when they have problems).

If I find a solution for the fast idle problem, I'll be sure to post it and let you know. For now, I just keep running the same carb because I get 22 mpg like it is.

[sawyer's720]

wow i don't even get close to that the way its running now. probably nearly 15 if im really easy on the pedal. before this all happened i was getting about 20. im just gonna go to the local picknpull and find an old carb and see if that fixes my problem.

[CT720RAT]

im having a similar issue with mine, however i removed ALL my vacuum lines except for the advance, when shes cols she will idle at around 100-1200 as soon as shes warm it wont idle lower than 2000, i have all the lines capped. could i have an issue with my vac. advance? ive messed with the idle srew plenty and it doesnt do a damn thing. Also i have a manual choke installed if it makes a difference.

[fastboatman29212]

I know this probably doesn't help you solve your problem, but I have just corrected my fast idle problem. All I needed to do was back off my throttle adjust idle screw. If memory serves me, I had tried that BEFORE I replaced all my vacuum lines and it did not help. She would just stall out at the stop sign every time.

I think it worked this time because all my vac lines are new. The prior owner probably set the idle screw higher to correct for vacuum leaks from old cracked lines.

Let us know more about how you solve your idle problem.

[sawyer's720]

so i threw a new carb from an 85 on my truck, idles alot smoother but still idles really high. i think when my buddy put the vacuum lines on he put them on wrong. im gonna take it to roseville to see if the parts man can tell me anything. unless you guys noticed anything out of whack in the pictures. also,anyone know where i can get a new vavle cover? i broke mine last night tightening down the air cleaner.

[fastboatman29212]

i'll look at the salvage yard here for a VC if you want me to. You have a Z24 motor right? They are $9 here from PullAPart. That's where I got mine.

[sawyer's720]

oh nice, it's 15 here. how much would shipping be?

[sawyer's720]

also. is it aluminum or light steel? i can't telll.

[fastboatman29212]

I'll need to know your zip code and I will estimate the weight to be 7 pounds. I'll let you calculate shipping Parcel Post from my zip code (29212).

I'd say if you can find one where you are, then by all means get it for $15. I like to help people, but if it's only gonna save you $5 or so, well . . . . . not to be mean . . . . but just go ahead and get the one near you. I was offering to look for one in case you couldn't find any.

[sawyer's720]

oh no offense taken. i'll be going to the picknpull tomorrow and then the dealership with the truck. im gonna see if they can tell me whats wrong...it's gotta be vacuum lines. also im gonna ask how much a FSM would cost. i have a haynes but it doesn't cover everything.

[captainzeros]

I picked up my (well used) FSM on ebay for I think about $10-15. Worth every single penny.

[sawyer's720]

alright thanks. i'll definitely check it out.

[woodbutcher5691]

im curious... :P
My 720 is a 1.8 ... And it has 2 vacuum lines, one for distributor cap and one for the air filter? You guys talk like its rotary engine with 100s of them, wich engine is in?

the z24 has a f*** of vac lines... this is what mine looked like back when i still had all that crap

[img]http://i373.photobucket.com/albums/oo178/PEZi303/IMG_04
Just to let ya'll know, I elimated 95% of the above "f***"today while replacing the T-stat. WOW! It's like finding 50 more horses in the barn.I'll be eliminating the charcoal can tomorrow as well. Maybe that will help on the MPG'S too! thanks PEZi! I swapped this engine in about 2 yrs. ago but all it's been was a trash runner since,"bout 1/2 mile tops, til a couple weeks ago.Another story there. I knew it was a better motor than what I was seeing/feeling. I found 4 vac openings and the dizzy adv. wasn't even hooked up.Good to know I don't need all that SH** hooked up. I had an '84 5spd before and it got waaay better milage than this one. The old motor "in the truck I got now" didn't like floorbard for an hour, but it threw a rod and still ran another 20 miles on the other three...... with a hole in the block. Again another story for a later day.

[sawyer's720]

new carb, new vavle cover, correct timing. pretty sure the vac lines are where they need to be. still idling high. hauls a** but idles high. timing is 3 degree BTDC

[woodbutcher5691]

Just a thought, I tried to set mine "by the book" but it ran like snot. I timed it by ear and it did run alot better. The old Z's have a habit of the harmonic balancer seperating and giving a false reading of the time. I don't know if this is true with the Z24's but it's something to ponder.Double check for a vac. leak. There are sofa king many on these.

[sawyer's720]

oh yeah i know, it runs better usually more advanced then it is. but if a retard it it backfires and just generally runs terrible. so im sure the timing is right. i can check the vac lines again. maybe its a leak at the carb. who knows. im probably gonna retire it so i can fund my next project.

[woodbutcher5691]

Whereabouts are you located?

[sawyer's720]

northern california.

[woodbutcher5691]

Well that Sh**s me outta luck taking it off your hands.

[sawyer's720]

yeah man, sorry. it's got about a week and a half to live.