The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help!!!1968 6cyl w/New exhaust manifold and rebuilt carb. Runs like crap

GuyO · 08-27-2012, 11:38 PM

Um, sounds like it is a timing issue. Turn the idle air mixture all the way in until it seats, then turn it out 2 full turns. The choke is confusing the issue, disconnect for now then chock the wheels, unplug your vacuum advance but plug off the carb (no vacuum), set the timing to 8 dbtdc, set the idle rpm to 600, turn idle mixture in until the engine RPM drops then back it out 1/2 turn. Recheck timing, reset idle speed to 600, reconnect the choke so that the linkage does not interfere with the throttle assembly.

08-27-2012, 11:38 PM	#4
GuyO Registered User Join Date: Nov 2011 Location: Kirkland, WA Posts: 343	Re: Help!!!1968 6cyl w/New exhaust manifold and rebuilt carb. Runs like crap Um, sounds like it is a timing issue. Turn the idle air mixture all the way in until it seats, then turn it out 2 full turns. The choke is confusing the issue, disconnect for now then chock the wheels, unplug your vacuum advance but plug off the carb (no vacuum), set the timing to 8 dbtdc, set the idle rpm to 600, turn idle mixture in until the engine RPM drops then back it out 1/2 turn. Recheck timing, reset idle speed to 600, reconnect the choke so that the linkage does not interfere with the throttle assembly.