Hello, hot misfires can happen for a number of reasons. For one, when the engine is hot components expand. Fuel injectors will act up differently when hot and cold. Usually, they act up when really hot. These fuel injectors have a very low resistance spec, it's only 1.0-1.2 ohms. Note: (This Spec is for Direct Injection fuel injectors_). I'm not sure why these are so low, most injectors are around 13 ohms, but if you have the means to, you can swap the fuel injector to a different cylinder and see if the code follows. You can do this with spark plugs and coils too as a diagnostic test. I know you have already changed those, but just for future reference. If you move the fuel injector to cylinder four for example and the misfire code goes to cylinder four, then you know what the issue is. If it doesn't, then you need to look into a possible compression issue. But with fuel injectors with such low resistance, I would try this first.
This car is not direct injection, correct? The fuel rail and injectors are up top near the valve cover?
I don't see any information about the 2.3 liter being direct injection (high pressure fuel system). That would change things a bit.
Just be careful with the injector seals, don't damage them when moving injectors around.
If your car has a high-pressure fuel system, you shouldn't swap injectors around. The fuel pressure spec is clear on what system your vehicle has. But if there are steel lines running to the fuel rail and a high-pressure fuel pump up top, you won't be able to just take a fuel injector out.
Below is a picture of a non-direct injection fuel system. These injectors will be 11-13 ohms resistance.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Saturday, May 28th, 2022 AT 3:44 PM
