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.

rattle from airbox while the hood is closed

Old Jul 17, 2020 | 03:28 PM
  #11  
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You didn't answer the question: Did you swap the coils? Try swapping #5 with #3 and see if the misfire cylinder changes on your scanner. Btw, most common for misfires on cylinders #1 & #5(front and rear), source due to, air to fuel ratio imbalance, especially if the misfire only occurs at low rpm's.
 
Old Jul 22, 2020 | 10:40 AM
  #12  
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Originally Posted by hummerz
You didn't answer the question: Did you swap the coils? Try swapping #5 with #3 and see if the misfire cylinder changes on your scanner. Btw, most common for misfires on cylinders #1 & #5(front and rear), source due to, air to fuel ratio imbalance, especially if the misfire only occurs at low rpm's.

So you're gonna get a laugh out of this. I should have followed your advice this whole time on the wiring lol. Small hole in the green wire the grey outside wire that goes to the map sensor. Once i fixed that all issues were solved. Hey trial and error on my part i guess.
 
Old Jul 22, 2020 | 10:58 AM
  #13  
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Live and learn. Now you got a good used map sensor and a set of coils backup, if ever needed in the future.
 
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