carb adjustment? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

willow72 · 05-30-2005, 04:37 AM

ok iknow you are supose to set the timing with your vacume advance disconected how about carb adjustment vacume advance hooked up or not hookedup?

70GMCer · 05-30-2005, 08:28 AM

If your asking about adjusting the mixture, I have always left the vacume advance connected. Use a tach/dwell meter for RPM settings. The easiest way I've found to adjust the idle mixture, is to turn 1 mixture screw at a time clockwise until you start to here the motor slowing up, then back out the screw to the highest idle RPM. Repeat to the other screw. Now, there are other methods of doing this, such as checking timing, etc. But just for a regular motor, this has always worked for me......

71-longbed · 05-30-2005, 11:35 AM

You are suppose to set your timing with the vaccum advance hose disconnected and plug with a bolt or a my favorite is a golf tee .. then you can use a timing light on the harmonic dampener to read the timing

When adjusting the carb I always leave it connected ... If you vaccum advance is hooked to manifold vaccum .. the idle should increase slightly when you plug it back in ..

Adjusting idle mixture is best done with a vaccum gauge

**VetteVet** · 05-30-2005, 12:08 PM

Here is a great site to explain vacuum gage readings.

http://www.classictruckshop.com/club...ts/vac/uum.htm

05-30-2005, 04:37 AM	#1
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	carb adjustment? ok iknow you are supose to set the timing with your vacume advance disconected how about carb adjustment vacume advance hooked up or not hookedup?

05-30-2005, 08:28 AM	#2
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	If your asking about adjusting the mixture, I have always left the vacume advance connected. Use a tach/dwell meter for RPM settings. The easiest way I've found to adjust the idle mixture, is to turn 1 mixture screw at a time clockwise until you start to here the motor slowing up, then back out the screw to the highest idle RPM. Repeat to the other screw. Now, there are other methods of doing this, such as checking timing, etc. But just for a regular motor, this has always worked for me...... __________________ 1997 GMC Sierra Ext 1965 Mustang

05-30-2005, 11:35 AM	#3
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	You are suppose to set your timing with the vaccum advance hose disconnected and plug with a bolt or a my favorite is a golf tee .. then you can use a timing light on the harmonic dampener to read the timing When adjusting the carb I always leave it connected ... If you vaccum advance is hooked to manifold vaccum .. the idle should increase slightly when you plug it back in .. Adjusting idle mixture is best done with a vaccum gauge __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

05-30-2005, 12:08 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	readin the vacuum gage Here is a great site to explain vacuum gage readings. http://www.classictruckshop.com/club...ts/vac/uum.htm __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

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