Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

H3 running rough

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Old Sep 5, 2023 | 11:33 AM
  #1  
Kevin Lindsay's Avatar
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Joined: May 2019
Posts: 8
Default H3 running rough

2007 h3 will not run after 5 minutes. it is idling rough. I have changed the values cover and Gasket, all new high end plugs, new ignition coils and fuel injectors. all new sensors, oil and filter, oil pressure sensor, rebuild transmission, cleaned the cat converter, fresh gas. the only thing that is left in the computer ( I cleaned the connection also.
HELP PLEASE
 
Old Sep 6, 2023 | 12:17 PM
  #2  
Doc Olds's Avatar
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Joined: Jul 2007
Posts: 13,090
From: Boat Town USA MI
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MOVED. Look before posting. The Hummer Forums Help & Suggestion Center is NOT for vehicle questions, but instead for questions on hoe to use Forum features, like posting pics....

Anyways, now that we have your H3 question in the H3 Section, you should get some answers. Don't know what "high end plugs" are, but if they are not direct OEM ACDelco replacements, they won't last long.

Scan and post any codes, stop throwing parts at a problem you do not understand.

Read this thread and let us know here if you have done items 1 through 7 (4&5 are replacement of plugs with inspection). Acts like it wants to stall/rough idle -No CEL -What To Do:
 
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