Holley causing "surging" @ idle - help with timing too... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

msgross · 09-16-2006, 04:03 PM

I put a used Holley on the 327 SBC and now it has a major surging idle (700- 2,000 RPM). Where do I start? Also it is so rich that truck is smoking like a chimney. Didn't do this with the Q-jet and old intake. Any good Holley tuners out there, it's undriveable at this point....thanks

Also, wha't the best timing to start with? Not looking for performance just a strong truck....

68 K-10 327 w/Holley 600CFM Edelbrock Performer (all just installed)

hgs_notes · 09-16-2006, 05:13 PM

Power valve is probably shot. Also the idle mix screws probably need adjusting, and there may be a vacuum leak either around the base of the carb to manifold gasket or or on the carb body itself.

When was it used last? Was it rebuilt before using? If so, who rebuilt it?

Here is one of holley instruction pages and also check the technical page for some good info.

http://www.holley.com/TechService/Instructions.asp

HG

zeeklu · 09-16-2006, 05:51 PM

http://www.bob2000.com/carb.htm

msgross · 09-16-2006, 08:14 PM

thanks...I was happy when it started after changing intake, carb, fuel pump and going to HEI all at once! Now it is smoking me out of my driveway and without an exhaust system my neighbors aren't happy either!

09-16-2006, 04:03 PM	#1
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Holley causing "surging" @ idle - help with timing too... I put a used Holley on the 327 SBC and now it has a major surging idle (700- 2,000 RPM). Where do I start? Also it is so rich that truck is smoking like a chimney. Didn't do this with the Q-jet and old intake. Any good Holley tuners out there, it's undriveable at this point....thanks Also, wha't the best timing to start with? Not looking for performance just a strong truck.... 68 K-10 327 w/Holley 600CFM Edelbrock Performer (all just installed) Last edited by msgross; 09-16-2006 at 04:04 PM.

09-16-2006, 05:13 PM	#2
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Re: Holley causing "surging" @ idle - help with timing too... Power valve is probably shot. Also the idle mix screws probably need adjusting, and there may be a vacuum leak either around the base of the carb to manifold gasket or or on the carb body itself. When was it used last? Was it rebuilt before using? If so, who rebuilt it? Here is one of holley instruction pages and also check the technical page for some good info. http://www.holley.com/TechService/Instructions.asp HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-16-2006, 05:51 PM	#3
zeeklu Registered User Join Date: Dec 1999 Location: Northwest NJ Posts: 746	Re: Holley causing "surging" @ idle - help with timing too... http://www.bob2000.com/carb.htm

09-16-2006, 08:14 PM	#4
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Holley causing "surging" @ idle - help with timing too... thanks...I was happy when it started after changing intake, carb, fuel pump and going to HEI all at once! Now it is smoking me out of my driveway and without an exhaust system my neighbors aren't happy either!



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