ok, ever since i've had my rex it's idle'd at 1100rpms always. i've had roxy (my car) for only about 6 months now and i've never had any probs with the idle except it's kinda high. now that i have everything tuned up and replaced and she's running awesome i went out and tried to drop the idle to around 750rpms like it should be. i know it's a little game you have to play with dropping the idle then messing with the air/fuel but holy crap. i got it down to about 700 and it was hunting to die so i ran out and leaned it out a bit and it went back to normal but the idle went back up!!!! i did this again and got it a little lower, i was going to do it again but i freaked out thinking i might be leaning it out too much???? i would say i had the air/fuel turned about 6 times out from being all the way in. i was kinda thinking maybe i have a vaccum leak but i dunno. so i went pretty much back to where it was which i almost don't want to touch now, because she pulls SO HARD and is running great! i tuned the air/fuel by butt dyno and she feels so wonderful now. sooo, basically, can you lean the rex out too much? (sorry so long!)

p.s. when i run it hard sometimes i can smell gas; indication of running rich?

 

where are you adjusting the idle ? wich screw?

 

the hidden as hell one buried under all the vaccum lines on the bottom right of the carb.

 

yah, thats the right screw! make sure the hot start assist cable isnt binding up.its the thing mounted on the driver side strut tower with a cable comming out of it.even if your car is running rich it should idle good! does it idle smooth?

 

crap, robert; i didn't even think to call and get your amazing expertise. help me pleeeaaaase!!! hahaha, by the by, your money is on it's way!

 

actually it idles a pretty smooth, but an occaisional roughness until i lean it out alot.

:edit: when it's rich it wants to stall

 

ahhh, i just thought of how to fix it! buy a Weber!
is the carb leaking gas? it might need rebuilding

 

hahahaha, can't do the weber yet! lol, i'm getting the msd boxes first remember? then comes the weber!!!!!!!!!!! YYAAAYYYYY, the carb actually isnt leaking gas, it's just weird. i'm gonna get out there and mess with it for a long time tomorrow and see what happens though, but back to my original question: how many turns on that air/fuel screw until it's just leaned out beyond recognition?

 

AFAIK you can't really hurt it much at idle by leaning it out. It'll start missing badly if its too lean, but I figure you'd notice that, so keep playing with it I guess.

 

When I had my car idling at 750-800 RPMs with the stock carb, the mixture screw was like 3 1/2 turns out or so.

~T.J.

 

what????? holy crap mine is definitely no where near that. i've checked the acc pump and everything. hmmmm, i'm running denso cold spark plugs, could that have anything to do with it?

 

my car was having some wierd idleing and i couldnt have it under 1000, but sometimes it would drop bellow that at the lights and im like WTF?

so today i put my foot under the accelerator pedal and put it up and the idle droped so i figure RETURN SPRING?
so i went to the shop, got a new spring and just put it with the old one to make it extra firm and then idle instanly droped too 500. so i screwed it back too 800ish and it now sits at 800..
long story but it might be whats happening with u?? but i really dont know...

 

djmickyg, holy crap mine does that mess too! when i sit at a light it kinda goes up and down a little. i'll try holding it back with my foot. how much is a return spring?hahahaha which one is that? is it in the haynes manual? what's also strange is my choke doesnt hold the throttle anymore either!!!! arrrrggg! could this all be linked???? MADNESS!

 

i didnt get a replacement spring for the nikki, i just grabed one off the shelf that was about 7cm long and i made it fit. it was only $2au
the choke is all linked in there somwhere but i dont use the chock so im not sure, the choke also does have a spring it in to.

EDIT: to ur what one is that question .. its the big fat spring on the carb and its right under where the throtle cable bolts onto the carb,

 

but are you using the nikki carb on your rex? if so, is the return spring near the top or bottom of the carb? on the firewall side? hahahaha, SO MANY LINKAGESESESS.

 

 

SWEEEET! thanks so much! i know that the plastics sleeve thats supposed to be on that return spring is like, ..... gone. is that bad? the spring seems to be ok. i've messed with it before not know what it was . hahaha

 

is that bottom pic with the blue engine bay your car??? if so, is it right hand drive?

 

yep thats my car, and yep its right hand..
so for u the clutch and brake fluid bottles wont be on that side.
if the black sleve is off, it shouldnt do anything bad and the spring may look still good, but remember its a 20 year old spring thats be pulled and strechech millions of times, its only going to develpope some sort of slack eventually..

 

my motor only has 50k miles on it. not the original thank goodness hahaha. well i went and looked at it today and that little pump thing that's supposed to go on it was off, so i put it back on. haven't messed with the idle yet. bout to go do that in a few.