Timing Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BLACK AND BLUE 67-72 · 01-31-2005, 10:56 PM

I recently swapped the motor into my 70 4x4 and have had a problem trying to get the engine running right. I replaced the distributor and made sure that it was on #1 TDC, the engine will start and run perfectly no miss or sputter except when I hit the gas then hesitation and backfire, when it's in gear and under a load it bogs down when the gas is applied. I have twisted the dist. every which way, if I go counter clockwise it doesn't seem to backfire as bad but when it is shut off it will not start unless it is turned back clockwise. Could a bad spark advance cause this, where it runs fine at idle and acts like that when at higher rpms? Could one work partially, at lower rpms and not higher?

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01-31-2005, 10:56 PM	#1
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Timing Problems I recently swapped the motor into my 70 4x4 and have had a problem trying to get the engine running right. I replaced the distributor and made sure that it was on #1 TDC, the engine will start and run perfectly no miss or sputter except when I hit the gas then hesitation and backfire, when it's in gear and under a load it bogs down when the gas is applied. I have twisted the dist. every which way, if I go counter clockwise it doesn't seem to backfire as bad but when it is shut off it will not start unless it is turned back clockwise. Could a bad spark advance cause this, where it runs fine at idle and acts like that when at higher rpms? Could one work partially, at lower rpms and not higher? __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA



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