Hesitation/Pop at 3/4 throttle, Buick 231

CaliWagon83

CaliWagon83

Royal Smart Person
Supporting Member
Nov 12, 2017
1,900
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

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
11,008
113
Socialist NY
check your plug wires
 
  • Like
Reactions: fleming442
500/600

500/600

G-Body Guru
Supporting Member
Nov 17, 2018
805
93
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.
 
H

herb

Not-quite-so-new-guy
Feb 10, 2018
5
3
2 things to test,
lean mixture or restricted exhaust pressure from plugged cat or muffler
 
J

JJake

n00b
Oct 14, 2014
4
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.
 
J

JJake

n00b
Oct 14, 2014
4
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.
 
  • Like
Reactions: fleming442
Dayzedandkonfuzed

Dayzedandkonfuzed

G-Body Guru
Feb 9, 2010
716
93
Anglemont, BC
Inspect your plugs. Cracked plug can do this. And if not, you'll see if there's one that's not like the others, which will point you in a direction.
 
  • Like
Reactions: fleming442

Please support GBodyForum Sponsors

Classic Truck ConsolesDixie Restoration DepotMike's MontesP-S-TSouthside Machine PerformanceUMI Performance

contact[email protected]for info on becoming a sponsor