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.

Bad Idle fix! lol

Old Mar 31, 2020 | 11:16 PM
  #11  
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wow I remember dealing with the 2.6 "Chrysler conquest with balance shafts" which oddly enough... the I5 engine also has them. I would rather do them again on the Mitsubishi 2.6 then on the I5 lol
 
Old Apr 1, 2020 | 10:30 AM
  #12  
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Originally Posted by BamaH3
Every one except camshaft actuator solenoid.
So you think that 1 item is the issue and only when there is no load? I doubt it.
Like I said..if any real mechanic with real mechanic background has ever encountered this..hit me up.
I can take pot shots at it on my own with my own knowledge of cars
A real jewel. If you knew the I5s, you would know how many have had rough idle issues because of that "1 item" that you have not bothered to even investigate. It is/was the subject of a TSB that caused 100s of H3s to present at the dealerships.

When you have a real issue, hit us up.

 
Old Apr 1, 2020 | 07:11 PM
  #13  
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When I had the ecm tuned they bumped the idle to 750, makes all the difference in the world
 
Old Apr 1, 2020 | 10:49 PM
  #14  
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Originally Posted by rockhound
When I had the ecm tuned they bumped the idle to 750, makes all the difference in the world
GL with that...
 
Old Apr 8, 2020 | 11:46 AM
  #15  
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Yes having great luck with that, its PCM of NC standard inclusion in their tunes. Fixes a lot of issues with the h3, and it runs great runs cooler, smoother, no more dimming lights no more rpm dive when coming to a light, gets better gas mileage, more power, less vibration, better air conditioning at a light
a slightly higher rpm at idle will not adversly affect your vehicle any vehicle, it may burn gas in some, I have owned plenty of vehicles over the last 40 years that had a 750 idle from the factory,

 
Old Apr 8, 2020 | 03:54 PM
  #16  
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Originally Posted by rockhound
Fixes a lot of issues with the h3, and it runs great runs cooler, smoother, no more dimming lights no more rpm dive when coming to a light, gets better gas mileage, more power, less vibration, better air conditioning at a light
a slightly higher rpm at idle will not adversly affect your vehicle any vehicle, it may burn gas in some, I have owned plenty of vehicles over the last 40 years that had a 750 idle from the factory,
Not only increasing fuel consumption and operating temp @idle, raising curb idle will also cause more wear on your engine, transmission, and your brakes.

 
Old Apr 8, 2020 | 04:37 PM
  #17  
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Originally Posted by BlueH3
RPMs go up a bit when AC on typically - enough to smooth idle
I just did an ac performance check on mine today, outside in a closed-in driveway under the sun, ambient temp: 70°, engine @operating temp 198°, A/C vent temp 40°. The idle speed with a/c off: 660, with a/c on: 680. Idle is smooth either way.
 

Last edited by hummerz; Apr 8, 2020 at 04:39 PM.
Old Apr 14, 2020 | 10:47 AM
  #18  
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Originally Posted by hummerz
Not only increasing fuel consumption and operating temp @idle, raising curb idle will also cause more wear on your engine, transmission, and your brakes.
been fixing building hot rodding and upgrading vehicles. For 40 years, I have never seen a slightly higher idle cause break wear on a vehicle that is stopped, how does a higher idle change the amount of break wear you see stopping from highway speeds? if a few rpms is going to wear your motor out you better never turn it on, shift into gear

a few more Rpm can actually cool your vehicle better especially in heavy traffic or desert heat
Better water flow more air, 100 to 150 rpm will not hurt anything , another 500 rpm at idle you would see detriment to your engine
I guess you are saying everyone that has used PCM of NC to tune their vehicle now has a trashed motor? the rpm adjustment is standard...
 

Last edited by rockhound; Apr 14, 2020 at 11:31 AM.
Old Apr 14, 2020 | 01:36 PM
  #19  
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heck i remember most vehicles in the late 80's and 90's ideled at 1000 rpm
 
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