Question about 1991 Nissan Pickup

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Idle screw settings? how many turns is each suppose to be set at

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If you have a tack it idels at 1500 to 2000 rpm per sec

Posted on Sep 10, 2010

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1 Answer

Idle set 750 double pumper


thee should be 4 sets of mixture screws on the carby
turn them all in till stop and then screw each one out 2 full turns
you may have use a bit of throttle to keep it idling but it is idles the screw one mixture screw in until the engine prms goes down turn it back out slowly until the engine again starts to die
count the screw turns and turn it back in 1/2 that number of turns
do that for all the mixture screws
have you set the float level correctly
iare there any vacuum leaks

Sep 19, 2015 | Cars & Trucks

1 Answer

Setting the idle mixture, turn out screw till highest idling, then still turn out and the engin still idle smooth?


thats what happens when you change the set screws,idle set screws will bring it to an idle,when you are at that 1st point,where it idles fine,stop,your idle set screw is done

Jul 15, 2015 | Cars & Trucks

1 Answer

What is the factory setting for the fuel mixture screw on a toyota 1.8 litre 2Y engine


most fuel mixture screws are set initially by turning it all the way in and then backing out 21/2 turns. This should allow start and idle and final adjustment can be done to fine tune it. Check that the idle solenoid is working as it will shut off the idle circuit if it is not

Nov 01, 2014 | Cars & Trucks

1 Answer

I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured


fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

Dec 24, 2013 | 1986 GMC C1500

1 Answer

1986 dodge ram 225ci slant six and a single barrel holley carb


Start with the idle needle screw first, the idle mixture screw. Seat it all the way in, first-don't overtighten and damage it, just seat it lightly, and back out two full turns. Run the engine and set the adjustment by ear to get your best lean idle: start turning the screw in (clockwise) 1/8 or 1/4 turn at a time till engine stumbles, dies, or runs rough. Keep the engine running, and turn screw out (counterclockwise) a little at a time till you hear the idle dropping. Now between those two settings is your best lean idle. Turn the screw in, a little at a time and wait for engine to respond, tiill you get the highest idle speed. Now set the other idle screw, curb idle, to the idle setting for your truck, probably about 700 rpm. You can move back and forth between the screws to get the best steady idle. Just don't over do it on the idle mixture screw.
Good luck.

May 08, 2012 | Cars & Trucks

1 Answer

I require the base settings for a carburetta, for an 1980 toyota hilux. it has an 18R motor, and a standard carb. im after the settings for the idle and mixture screws. thanx


Center screw turn all the way in than back out one full turn and a half,,the idle I play by ear untill it sounds good. Or you can Google ( How to tune the idle and mixture screws on a 18R toyota motor)

Mar 07, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

Trying to set my rpm on a 84 cutlass supreme brougham,3.8l v 6 231 cu in vin a.how am i suppose to set this i using a inductive tach reader it idles at 750 range(not sure if thats where its suppose to be...


the fast idle is set when the choke is close to set the cam on the HIGH STEP. turn the car off hot, now pull the accelerator back and close the choke with your hand, now let the accelearator back to idle, now the idle is on the high step, carnk the car and set the idle speed, the base the fast idle screw is against the step on the pass side of carb.

Oct 09, 2009 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

Push the accelerator, nothing happens or falls on face and dies


you might have a vacuum leak just get a can of carb cleaner the spray kind not the foam stuff and spray it around your carb and vacuum lines and see if anything changes.l

May 21, 2009 | 1987 Volkswagen Jetta

3 Answers

Erratic Idle problem in 91 accord


THE DISTRIBUTOR WILL CAUSE THIS PROBLEM IN A HONDA TRY A KNOWN GOOD ONE .

Apr 02, 2009 | 1991 Honda Accord

1 Answer

Need to know whats the rpms are supposed to be at while idling


i have the same truck theres an idling screw on the leaver you cable hooks to set idle to 900 or 1000 rpm

Feb 22, 2009 | 1994 Ford F150 Styleside Supercab

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