2008 Chevy Uplander I got a code P1174 Trim Fuel cylinder I got new plug wires b
What is your question?
because it was mis firing going up hills the engine light came on after 65 miles then I installed new coil this seamed to work but then after driving on highway miles after 250 miles engine light came back on I then coded it again always P1174 I took the light out and then drove 36 miles it came back on again when light comes on I seem to get mis firing when I put on the gas till it levels out some one told me to replace a Injector or ejectores I think it may be a o2 sensor can any one help this only has 36000 miles on it and I have owned it for about 4 months it runs very good at times even with the light on then other times mis firing after light comes on
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Hello,
The suggestion to change the fuel injector is close, but the fuel injector should be tested, not changed immediately.
The engine control module/unit (ECM/ECU) is not able to adjust the fuel trim for that cylinder to provide the proper amount of fuel for combustion. This will cause a misfire.
In this case, you may have poor continuity for the wiring harness that powers the injector, or the injector may be damaged, clogged, or sticking.
In any of those three cases, replacing the injector would solve the issue, but resealing, cleaning, or replacing the pigtail (wires and connector) could also solve the issue.
Diagnosis will be needed to prove the failure before purchasing parts.
