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mkinsey7
User
Dec 29, 2010, 8:18 AM
Post #1 of 6
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91 sonoma 4.3 coughs
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 29, 2010, 8:53 AM
Post #2 of 6
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Re: 91 sonoma 4.3 coughs
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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
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mkinsey7
User
Dec 29, 2010, 10:30 AM
Post #3 of 6
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Re: 91 sonoma 4.3 coughs
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thx, I will start there, I have an extra ignition module also to try along with cap and rotor
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 29, 2010, 11:28 AM
Post #4 of 6
(3253 views)
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Re: 91 sonoma 4.3 coughs
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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
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mkinsey7
User
Jan 5, 2011, 1:55 PM
Post #5 of 6
(3220 views)
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Re: 91 sonoma 4.3 coughs
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New cap and rotor did the trick.. the contact were just covered with corrosion, thx
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 5, 2011, 4:57 PM
Post #6 of 6
(3212 views)
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Re: 91 sonoma 4.3 coughs
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Glad to hear it!
Good luck,
T
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