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| HOW do you tune a sierra carby https://auszookers.com/forum/viewtopic.php?f=5&t=5928 |
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| Author: | 31zook [ Sat Aug 08, 2009 8:16 pm ] |
| Post subject: | HOW do you tune a sierra carby |
Hey yall, i pulled my carby apart cleaned it up unclogged some lines replaced alot of gaskets, rubber thingo's and a rod that makes fuel squirt in. It's now working and running pretty smooth but needs some pretty serious tune. The plugs are black and I've been told that that is because it's running rich? I found the idle screw the choke screw, but i can't figure out how you mix the fuel and air right. Is is a play around thing or a take it to a shop kinda thing? It's still blowing smoke... will tuning it help? I have a FSM so ill keep looking in that... |
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| Author: | morpheus [ Sat Aug 08, 2009 8:21 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
31zook wrote: i pulled my carby apart cleaned it up unclogged some lines replaced alot of gaskets, rubber thingo's and a rod that makes fuel squirt in..
lol... |
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| Author: | eldo [ Sat Aug 08, 2009 8:32 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
turn the mixture screw out 2.5 turns, this should give you a point to start from, make sure the idle is ok and the timing is correct, there was an old way of adjusting it via the low idle and then turning the mixture until a high idle and then re adjusting the idle screw, but it has been ages since i have had a carby car so i have forgotten the technique, im sure someone here will know it, maybe one ofthe older and more wise members!!!! |
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| Author: | 31zook [ Sat Aug 08, 2009 8:49 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
where is the mixture screw? |
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| Author: | eldo [ Sat Aug 08, 2009 8:58 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
shit josh i have not even looked at my carby yet.... im guessing it will be down the bottom of the carby somewhere and it would of probably had an oring on it that you would of replaced, it will be one of the screws you put back in that looks like it doesnt hold it together if you know what i mean, it should just screw into the body of the carby |
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| Author: | eldo [ Sat Aug 08, 2009 8:59 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
oh and standard setting will be 1.5 to 2 turns out not 2.5 as i stated above |
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| Author: | 31zook [ Sat Aug 08, 2009 9:01 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
ok thanks ill go fustrate myself now thanks |
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| Author: | eldo [ Sat Aug 08, 2009 9:03 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
hey read your service manual, it will describe the old stlye tuning tips i described above, it is usually a generic page that all old service manuals have in them, kind of like the spark plug chop page that shows the plug colours, infact i think it is even in that same section |
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| Author: | Rockhopper [ Sat Aug 08, 2009 9:20 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
The mixture screw is should be capped from the factory, but I'm guessing after 20 odd years, the caps probably been removed by now. On the base of the carby where it attaches to the inlet manifold there should be a screw with a spring behind it. From memory I think it's on the rocker cover side of the carby. This is your mixture screw. With your engine running, screw it in to lean off the idle mixture. You should notice the idle increse and smoothen out if it's running too rich. Keep screwing it in until you notice the idle deteriorating again, then screw it back out again about half a turn. That's it, and the best you'll get without hooking it up to a 4 gas anylizer. If you screw it in all the way and the car is still running, you have a problem. Maybe your float level is set too high, but it's really anyones guess until you tear the carby down again. |
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| Author: | 31zook [ Sat Aug 08, 2009 11:26 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
thanks rockhopper, yeah i wound it in to far and now it runs rough as...grr But i can't move the stupid screw when on the car... does anyone have a brilliant solution for this? |
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| Author: | eldo [ Sat Aug 08, 2009 11:48 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
why not josh, do you need a bent screw driver or something??? |
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| Author: | 31zook [ Sat Aug 08, 2009 11:59 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
um mine is like a a hex bolt but the inside of the hex is smooth i can only turn it with pliers... |
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| Author: | Trojan [ Sun Aug 09, 2009 12:42 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
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| Author: | 31zook [ Sun Aug 09, 2009 12:50 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
sweet avitar trojan  no im not going to throw it out... ill keep playing later
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| Author: | eldo [ Sun Aug 09, 2009 4:34 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
are you sure you have the right screw, i cant imagine them building a carby that cant be tuned whilst on the car, however im willing to be corrected |
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| Author: | 31zook [ Sun Aug 09, 2009 8:02 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
no im not even sure i rebuilt the carby... or was it the tyre... yes the mixture screw is the correct one it made a heap of difference once i played with it... |
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| Author: | foolsp33d [ Sun Aug 09, 2009 11:07 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
heres some pictuures for reference sake 1.3 Carb. Top: 
Bottom: 
Rear: 
Front: 
Drivers side: 
Passenger side: 
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| Author: | 31zook [ Sun Aug 09, 2009 11:33 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
last photo, bottom, dead center, is the mixture adjustment screw. Mine is screwed in till it stops then 1 and a half turns out. This is great as it starts pretty much as soon as the key is flicked on and idles at about 1000rpm. But once warm the idle is all wrong it starts to die then at the last minute it squirts fuel in and it comes back up again. It repeats this cycle about every 5seconds... i read something about a fast or warm idle adjustment and i can't find it in my FSM. PS: these photo's help heaps with describing where crap is |
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| Author: | Zook_Fan [ Sun Aug 09, 2009 11:41 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
your warm idle adjust is the screw that you can see just above the hose in the last pic, to the right of the carby |
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| Author: | 31zook [ Sun Aug 09, 2009 11:45 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
oh i was adjusting that one for cold idle... so where is the cold idle adjuster... sorry for all the questions im not dumb... honest |
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| Author: | Zook_Fan [ Sun Aug 09, 2009 11:50 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
well it is just really the fine adjust screw. usually you use it just to fix it up while warm and because you shouldnt have to move it much it wont upset cold. you need to be playing with the other things and getting it good before going to that one. Like the two screws in the centre of the pic third from the bottom and the mixture adjust. then when they are pretty good, it should be running fairly well cold, just slightly adjust the fine adjust to correct it up |
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| Author: | 31zook [ Mon Aug 10, 2009 12:00 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
At a guess thats the idle up adjusment? |
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| Author: | Zook_Fan [ Mon Aug 10, 2009 12:21 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
yes i believe so |
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| Author: | 31zook [ Mon Aug 10, 2009 12:48 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
Cool beans ill go play tomorrow, cheers |
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| Author: | foolsp33d [ Mon Aug 10, 2009 1:28 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
Glad the pictures Helped sort out some screwy issues 
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| Author: | eldo [ Mon Aug 10, 2009 1:35 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
screw you guys im goin home |
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| Author: | Rockhopper [ Mon Aug 10, 2009 9:13 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
The screw just above the hose in those pictures is your idle adjustment. To see the cold idle adjustment, operate the throttle by hand to full throttle and you'll see it on the throttle linkage. You can see it clearly on the left of the second photo and the bottom on the third photo. On the bottom of the 4th photo is another screw which is the adjustment for the idle up adjustment. I'm guessing this screw in conjunction with your idle screw is what you'll want to adjust. Fast idle by the way (when cold) should be between 1500 and 2000 rpm. Just check one other thing. I know this sounds stupid, but does the car behave any differantly when you switch the headlights on? |
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| Author: | 31zook [ Mon Aug 10, 2009 10:10 am ] |
| Post subject: | Re: HOW do you tune a sierra carby |
Rockhopper wrote: ...I know this sounds stupid, but does the car behave any differently when you switch the headlights on?
Yes it flips over the bottom half splits in 2 and starts running. Then out of the bonnet comes a head and the wheels become arms and it starts yelling at stuff and shooting baddies... all i wanted was my head lights. OK ill have to go out with all this info and play with it, they do seem fickle |
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| Author: | Zook_Fan [ Mon Aug 10, 2009 8:32 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
your a dick. what he meant by the spot lights turning on was to see if the idle up solenoid is still working, a valid suggestion |
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| Author: | 31zook [ Mon Aug 10, 2009 9:19 pm ] |
| Post subject: | Re: HOW do you tune a sierra carby |
haha ok i was asking for that...  Ok ill check tonight
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