Carb Sensitive - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Slick67 · 03-07-2011, 06:09 PM

Calling the carb experts on this one. I have a 600cfm Edelbrock and after timing the engine the carb is so sensitive that if you get a finger even close to it the truck dies!??!?! I have never seen this before and am stumped maybe electrical so I grounded the engine in another spot to eliminate that. Anyone run into this before and what was the cure?

ETsC10 · 03-07-2011, 10:45 PM

Slick, it does seem your'e getting many guesses here so lets try you in the engine forum.

Good luck!

Slick67 · 03-08-2011, 12:45 AM

Quote:

Originally Posted by ETsC10

Slick, it does seem your'e getting many guesses here so lets try you in the engine forum.

Good luck!

Thanks.

cableguy0 · 03-08-2011, 12:46 AM

Give us more info. Where is your timing set at. Are you saying that when you move the idle mixture screws the engine dies?

Slick67 · 03-08-2011, 12:59 AM

I have the timing set at 10 BTDC with the vacuum lines plugged. The timing light is at 36. The electric choke is hooked up. When you get within an inch of the adjustment screws the rpms drop. When you actually touch the screws it will die.

60ratrod · 03-08-2011, 01:41 AM

sounds like there may be a vacuum leak. do you happen to know what the engine is idling at? try adjusting the idle speed screw on the throttle arm to kick up the idle a little bit and see if that helps. on my trucks, they usually don't like to have an idle below 700 rpms or so in park. try to see what your idle rpms are and go from there. sometimes after adjusting the timing you have to adjust the idle speed screw because adjusting the timing may increase or decrease your idle speed, depending on if you had to advance or retard the ignition. retarding usually drops the idle, advancing usually increases the idle

*Ticker* · 03-08-2011, 02:53 PM

Quote:

Originally Posted by Slick67

I have the timing set at 10 BTDC with the vacuum lines plugged. The timing light is at 36. The electric choke is hooked up. When you get within an inch of the adjustment screws the rpms drop. When you actually touch the screws it will die.

What do you mean by the timing light is at 36?

*Ticker* · 03-11-2011, 12:16 PM

I'll be thinking good thoughts; good that they're willing to make it right.

03-07-2011, 06:09 PM	#1
Slick67 Sofa King Crazy!! Join Date: Oct 2008 Location: Houston, TX Posts: 3,090	Carb Sensitive Calling the carb experts on this one. I have a 600cfm Edelbrock and after timing the engine the carb is so sensitive that if you get a finger even close to it the truck dies!??!?! I have never seen this before and am stumped maybe electrical so I grounded the engine in another spot to eliminate that. Anyone run into this before and what was the cure? __________________ You found the Tater. *My Blazer Build (New)* - http://67-72chevytrucks.com/vboard/s...d.php?t=654650 *My 67 Build* - http://67-72chevytrucks.com/vboard/s...d.php?t=335650 67 Chevy LWB big window a/c AKA TOTALLED BY A JACKASS. 1972 2wd Blazer "Porterbuilt and Sloshed"

03-07-2011, 10:45 PM	#2
ETsC10 Hand Crafted C-10 Join Date: Aug 2006 Location: Burien, WA Posts: 5,180	Re: Carb Sensitive Slick, it does seem your'e getting many guesses here so lets try you in the engine forum. Good luck!

03-08-2011, 12:46 AM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Carb Sensitive Give us more info. Where is your timing set at. Are you saying that when you move the idle mixture screws the engine dies? __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

03-08-2011, 12:59 AM	#5
Slick67 Sofa King Crazy!! Join Date: Oct 2008 Location: Houston, TX Posts: 3,090	Re: Carb Sensitive I have the timing set at 10 BTDC with the vacuum lines plugged. The timing light is at 36. The electric choke is hooked up. When you get within an inch of the adjustment screws the rpms drop. When you actually touch the screws it will die. __________________ You found the Tater. *My Blazer Build (New)* - http://67-72chevytrucks.com/vboard/s...d.php?t=654650 *My 67 Build* - http://67-72chevytrucks.com/vboard/s...d.php?t=335650 67 Chevy LWB big window a/c AKA TOTALLED BY A JACKASS. 1972 2wd Blazer "Porterbuilt and Sloshed" Last edited by Slick67; 03-08-2011 at 01:00 AM.

03-08-2011, 01:41 AM	#6
60ratrod yes, i do Join Date: Jun 2007 Location: Spokane, wa Posts: 2,734	Re: Carb Sensitive sounds like there may be a vacuum leak. do you happen to know what the engine is idling at? try adjusting the idle speed screw on the throttle arm to kick up the idle a little bit and see if that helps. on my trucks, they usually don't like to have an idle below 700 rpms or so in park. try to see what your idle rpms are and go from there. sometimes after adjusting the timing you have to adjust the idle speed screw because adjusting the timing may increase or decrease your idle speed, depending on if you had to advance or retard the ignition. retarding usually drops the idle, advancing usually increases the idle __________________ ERROR 404....... SNAPPY COMEBACK NOT FOUND _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900

03-11-2011, 12:16 PM	#8
Ticker Account Suspended Join Date: Oct 2009 Location: Sammamish, WA Posts: 2,404	Re: Carb Sensitive I'll be thinking good thoughts; good that they're willing to make it right.



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