Auto Repair & Maintenance : How to Adjust Carburetors

Idle speed and idle mixture are the two most common adjustments made to carburetors, and these adjustments start by warming up the vehicle to full engine-operating temperature. Find out how to perform a lean-drop adjustment with help from an ASE-certified master automobile technician in this free video on carburetors.

Expert: Clark Mason
Bio: Clark Mason is an ASE-certified master automobile technician.
Filmmaker: Christian Munoz-Donoso

Category:

Autos & Vehicles

Tags:

• auto
• repair
• car
• maintenance
• starters
• antifreeze
• transmission
• oil
• changes
• diagnose
• problems
• electrical
• radiators
• fuel
• injectors
• brakes
• carburetors

[TheFRiNgEguitars]

right idea, but wrong. First, with the engine warm, shut it down. Turn each idle screw all the way in, then back out about 3 full turns. This ensures that both barrels are set equally. Balance is important. Start the engine, high idle at 2k for 15 sec. Set the idle speed. Then turn each mixture screw OUT 1/4 turn at a time and note RPM INCREASE! If no increase, turn IN and note increase. At max idle speed, readjust the speed to spec. NOW turn each idle screw slightly IN to RPM drop spec..

[Lokivoid]

dont tune the idle mixture according to idle RPM like stated in this video. You tune for optium manifold vacuume at idle RPM and raise the mixture until CFM does not incresse. The only reason for using a tach is to monitor and readjust idle speed as you change the mixture keeping it at the desired idle speed.

[kingkong8974]

@hippohoppa I had that trouble on my Mazda pickup. It had a random misfire from bad plug wires and a slightly too lean of a mixture and incorrect idle speed. Oh and a vacuum leak. If I were you, I'd check to make sure that all cylinders have good compression, then check to make sure that they all have good spark. Then I'll check for a vacuum leak and lastly do what this video shows and it'll run perfect.

[WindowsIP]

Can you help me guys my car is Renault 19 1.7 CC motor F2N carburetor SOLEX 32/34 Z13

problems is : the RPM is not (( stable ) for example its start 800 RPM then after few minutes it become 700 then it back to 800 this make the Engine noise

my Question can tuning the idle mixture fix this problem

i have some photos for the same carb type

h t t p i1224.photobucket. com/albums/ee363/windows700/so­lex/idelmixtue.jpg

please advice

[76ChevyC10]

Hey, i got one question i need solved! I was test driving my truck for the first time last night and after driving 1 mile it seemed to bog out and had no throttle response. after i realized it stalled i pulled it over and it had a really rough time trying to start and i had to wait 10 minutes to get it going again another mile. I have replaced the fuel pump, filter, carburetor, lines, almost everthing except for the tank. could you help me out? its a 4 barrel rodchester quadrajet.

[390merc65]

you can alsoc use a vacumm gauge to do this...

[thejokeroldschool]

@TheFRiNgEguitars Dude you should make a video, it will help a lot.

[autumn90]

@TheFRiNgEguitars thats the way i learned in school. not this video . smh.

[hippohoppa]

My old Fiat 132 2000 became troublesome after the last repair and i don't know why :s . It used to be stable after i start the engine, now it starts and it wanna turn off unless i hit the gas paddle for about 10 min, it never did that b4, any idea why?

i will appreciate any help, thanks.

[xgrapher]

Respond to this video...  And before you do anything take note of the turns of each and every screw by turning them in till it seats and counting the turns while you do that.

[xgrapher]

@TheFRiNgEguitars These few lines beat the video on any given sunday!