Hesitation/Pop at 3/4 throttle, Buick 231

CaliWagon83

Royal Smart Person
Supporting Member
Nov 12, 2017
1,937
113
Orange County, CA
Hi guys. Just took the wagon out for a drive last night. It's done this every now and then, but seems to be a intermittent issue. It seems to happen when I'm at about 3/4 throttle. Not "floored" but more than light/half throttle. The car will be going, and suddenly stumble, and make a muted "pop" sound. It will then kind of "clear its throat" and keep driving along. Anyone else had this issue, and what's the possible fix? Thanks in advance.
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,974
113
Socialist NY
check your plug wires
 
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500/600

Royal Smart Person
Supporting Member
Nov 17, 2018
1,148
113
West Virginia
Quadrajet? If so tighten the secondary air valve spring about 1/16 turn. Sounds like it is right on the verge of being lean at that point.
 

herb

Not-quite-so-new-guy
Feb 10, 2018
7
3
2 things to test,
lean mixture or restricted exhaust pressure from plugged cat or muffler
 

JJake

Not-quite-so-new-guy
Oct 14, 2014
5
3
Hi guys. Just took the wagon out for a drive last night. It's done this every now and then, but seems to be a intermittent issue. It seems to happen when I'm at about 3/4 throttle. Not "floored" but more than light/half throttle. The car will be going, and suddenly stumble, and make a muted "pop" sound. It will then kind of "clear its throat" and keep driving along. Anyone else had this issue, and what's the possible fix? Thanks in advance.
 

JJake

Not-quite-so-new-guy
Oct 14, 2014
5
3
It's lean. More jet or smaller rods. My 1978 Olds that we have had since new did this, dealer couldn't fix. I went up one size on the main jets and the problem went away. Never had to pass an emission test in Michigan.
 
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