|
|
mkinsey7
User
Dec 29, 2010, 8:18 AM
Post #1 of 6
(2801 views)
|
|
91 sonoma 4.3 coughs
|
Sign In
|
|
91 4.3 engine will cough a couple of times under light acceleration and then sometimes will cough many times, and other days run well, have used "heet" and "sea foam " in throttle body and in gas tank. cough makes the truck jerk, it sounds like a real cough. it is a gmc with 120,00 miles.
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 29, 2010, 8:53 AM
Post #2 of 6
(2794 views)
|
|
Re: 91 sonoma 4.3 coughs
|
Sign In
|
|
May not be fuel related but rather the secondary ignition items - dist cap+rotor, wires and plugs instead of a fuel issue. Hard to say. If one spark plug looks different from the rest or two then those are the ones to chase down,
T
|
|
| |
|
|
mkinsey7
User
Dec 29, 2010, 10:30 AM
Post #3 of 6
(2786 views)
|
|
Re: 91 sonoma 4.3 coughs
|
Sign In
|
|
thx, I will start there, I have an extra ignition module also to try along with cap and rotor
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 29, 2010, 11:28 AM
Post #4 of 6
(2784 views)
|
|
Re: 91 sonoma 4.3 coughs
|
Sign In
|
|
Generally the module is a go or no go thing but make sure its wiring is good.
You can mist dist cap with water and may show that it's the problem along with wires. Sometimes you can see a carbon trace in a bad cap and sometimes not. FYI - secondary problem are usually worse with damp conditions but could do it anytime,
T
|
|
| |
|
|
mkinsey7
User
Jan 5, 2011, 1:55 PM
Post #5 of 6
(2751 views)
|
|
Re: 91 sonoma 4.3 coughs
|
Sign In
|
|
New cap and rotor did the trick.. the contact were just covered with corrosion, thx
|
|
| |
|
|
Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 5, 2011, 4:57 PM
Post #6 of 6
(2743 views)
|
|
Re: 91 sonoma 4.3 coughs
|
Sign In
|
|
Glad to hear it!
Good luck,
T
|
|
| |
|
Auto Repair Home
SEARCH
WHO'S 
LOG 
Car idles funny but doesn't throw codes
Rear brake retaining clips
speedometer wild deflections; sometime pump gas
Car stalling problem
