random misfire at idle
#1
random misfire at idle
Hi I'm new to the forum so hi everybody. I have a problem with my h2 I'm getting a misfire on 4&5 cylinder only at idle. While driving there is no problem at all. I changed spark plugs ,wires, maf sensor, map sensor, injectors, intake manifold and gaskets,cleaned throttle body,cleaned k&n filter,changed fuel filter,did smoke test to check for air leaks, checked cylinder compression it was about 120 psi on all more or less, checked fuel pump. The problem never went away. Check engine light is on and the code is po 300. Drove the truck with the computer hooked up and there is no miss fire only when you stop at the light at idle. Please help, I'm running out of ideas.
#2
The SEARCH box above will be your best tool: I put in P0300 and got these
It would also help with the year or engine size.
https://www.hummerforums.com/forum/h...0300-h2-28394/
https://www.hummerforums.com/forum/n...t-issue-28121/
https://www.hummerforums.com/forum/g.../fed-up-26952/
https://www.hummerforums.com/forum/h...jectors-25170/
https://www.hummerforums.com/forum/h...p-11603/page3/
https://www.hummerforums.com/forum/h...ne-light-8861/
https://www.hummerforums.com/forum/h...-misfire-3051/
It would also help with the year or engine size.
https://www.hummerforums.com/forum/h...0300-h2-28394/
https://www.hummerforums.com/forum/n...t-issue-28121/
https://www.hummerforums.com/forum/g.../fed-up-26952/
https://www.hummerforums.com/forum/h...jectors-25170/
https://www.hummerforums.com/forum/h...p-11603/page3/
https://www.hummerforums.com/forum/h...ne-light-8861/
https://www.hummerforums.com/forum/h...-misfire-3051/
#4
Did you change the injectors or just clean them? Everything that I am finding seems to be clogged injectors. But there are several other things to check too. Here's some info on the code.
Automotive Technical Service Bulletin - TSB | Engine-Codes.com
P0300 HUMMER Cylinder Misfire Detected Random Cylinders OBDII Engine Light Trouble Code | Engine-Codes.com
Automotive Technical Service Bulletin - TSB | Engine-Codes.com
P0300 HUMMER Cylinder Misfire Detected Random Cylinders OBDII Engine Light Trouble Code | Engine-Codes.com
#7
Hi I'm new to the forum so hi everybody. I have a problem with my h2 I'm getting a misfire on 4&5 cylinder only at idle. While driving there is no problem at all. I changed spark plugs ,wires, maf sensor, map sensor, injectors, intake manifold and gaskets,cleaned throttle body,cleaned k&n filter,changed fuel filter,did smoke test to check for air leaks, checked cylinder compression it was about 120 psi on all more or less, checked fuel pump. The problem never went away. Check engine light is on and the code is po 300. Drove the truck with the computer hooked up and there is no miss fire only when you stop at the light at idle. Please help, I'm running out of ideas.
#9
Hi I'm new to the forum so hi everybody. I have a problem with my h2 I'm getting a misfire on 4&5 cylinder only at idle. While driving there is no problem at all. I changed spark plugs ,wires, maf sensor, map sensor, injectors, intake manifold and gaskets,cleaned throttle body,cleaned k&n filter,changed fuel filter,did smoke test to check for air leaks, checked cylinder compression it was about 120 psi on all more or less, checked fuel pump. The problem never went away. Check engine hid headlight kits on and the code is po 300. Drove the truck with the computer hooked up and there is no miss fire only when you stop at the light at idle. Please help, I'm running out of ideas.
There could be some problem with code have you checked it properly?
There could be some problem with code have you checked it properly?
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