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91 sonoma 4.3 coughs


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mkinsey7
User

Dec 29, 2010, 8:18 AM

Post #1 of 6 (3151 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
Tom Greenleaf profile image

Dec 29, 2010, 8:53 AM

Post #2 of 6 (3144 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 (3136 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
Tom Greenleaf profile image

Dec 29, 2010, 11:28 AM

Post #4 of 6 (3134 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 (3101 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
Tom Greenleaf profile image

Jan 5, 2011, 4:57 PM

Post #6 of 6 (3093 views)
Re: 91 sonoma 4.3 coughs Sign In

Glad to hear it!


Good luck,

T







 
 
 






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