Trailblazer problem P0300 code

Look if this dialogue can help you:

Dialogue with the Chevrolet coach:

Tec. Hernán: My name is Hernán and I will attend to his

client consultation: Good afternoon Hernán, I have a problem with a 2004 trailblazer, 6 cylinders, P0300 fault code. I already replaced the IAT Air temperature sensor input of the engine that was giving me code, I changed the spark plugs and coils, but when I turned it on, it presents P0300 code. I do not know whether to get the injectors to rule out

Tec. Hernán: this is two probabilities. After doing everything you comment, you must before removing the injectors measure the fuel pressure, it must have a minimum of 55 psi.

Customer: Then I first rule out the fuel pump pressure ... If I do not pass to injection ...

Tec. Hernán: Exactly, I recommend you replace the fuel pump filter, it always generates missphirs because it restricts the fuel flow, otherwise you must clean the injectors and replace the microfilters.

Customer: In case you do all that, including injectors, and continue the failure, do you recommend reviewing something else?

Tec. Hernán: Misfires are also generated when it has carbon in the engine but for this you must remove the cylinder cover and proceed to decarbonize, but this occurs in vehicles with high mileage, the most common is what I have explained, you must also use the original spark plugs to prevent misfires.

Customer: OK, perfect. It has 182,000 kms of travel, it is possible. Apart from the failure, when it is at a minimum it is as if a cylinder does not work. The spark plugs are Platinum acdelco. I will do all that.

Tec. Hernán: If you have a scanner you can see the Misfires by

client cylinder: My scanner is a generic of Obd 2

Tec. Hernán: To measure the missfires you need a more professional scanner like Tech 2, there you can check a graph by cylinders where it is manifested in the graph which is the cylinder that the misfire does.

Customer: Ah, Ok perfect ... I go where a friend then has Cartman Scann Pro

Tec. Hernán: We are here to serve him, have the goodness of giving a favorable rating since it is very important for my profile. Greetings, Att. Hernán

Client: Thank you Hernán.