Swapped Injectors, Losing Preasure

djburke87

I'm not saying the fuel pump may not be the problem, but the issue only occurred immediately after I put injectors in. It has been a problem since, and never before. It makes me think it has to be an injector issue that is a result of me messing with it.

If I start the car and it runs for a couple minutes and turn it off, it starts up like it used to if I start it within about 30 minutes

How do you check the fuel volume?

I don't know what my fuel trims are or how to find them. Unfortunately, the previous owner put test pipes on my car. I have ordered HFCs, but they won't be here for another month. I also have new o2 sensors, both upstream and downstream, to put in when I do the HFCs.

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2018 Nismo - Z1 Cold Air Intake, Z1 Silicone Hoses, Catalytic Converter Delete, Remark Axleback V1 Exhaust

Rusty

Do not install the new O2 sensors until you have installed the hfc first. Use new oem O2 sensors. There have been problems with other O2 sensors in the past.

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djburke87

That's the plan!

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2018 Nismo - Z1 Cold Air Intake, Z1 Silicone Hoses, Catalytic Converter Delete, Remark Axleback V1 Exhaust

SonicVQ

Let me back up to understand the background:
You had a misfire and replaced all the fuel injectors. Since then, the car will crank more than usual before starting ONLY if it has been sitting.

Is the misfire gone with the new injectors?
Where did you buy the injectors and what brand are they?
(There are MANY fake/cheap/counterfeit parts available today that cause endless problems)

Your fuel trims can be seen using any OBD scan tool, even a $10 EL327 and a $7 app will show you.

Just to cover all bases, the fuel trims will tell us if the engine thinks a bank is rich or lean and by how much. Very useful for troubleshooting air/fuel problems.

From a troubleshooting perspective, what tests did you do that lead you to replace all the injectors?
There are tests that can be done that can tell you which injector is bad or which ignition coil...

AND they are much cheaper than throwing hope/prayers and parts at the problem.

djburke87

Correct

I got them from Rock Auto. They are a "remanufactured" injector, meaning the were rebuilt and tested by GB Remanufacturing. It is an OEM injector that has been rebuilt by a 3rd party. Maybe I should put my other ones back on with the new o-rings I have, since they didn't have this problem.

I have a scan tool, I will see if it has that option after work. Thanks!

I have replaced spark plugs, swapped coil packs(remained on cylinder 3), cleaned the MAFs, done a throttle body relearn, and now replaced the injectors. I am open to advice, but also kind of hoping the issue will be resolved when I put cats back on it and new O2 sensors.

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2018 Nismo - Z1 Cold Air Intake, Z1 Silicone Hoses, Catalytic Converter Delete, Remark Axleback V1 Exhaust

SonicVQ

I've never used "hope" as a strategy, but maybe it will work for you.
Good luck!

djburke87

Okay, so what would your strategy be? Not to put on catalytic converters and new O2 sensors? Just leave it with test pipes and run it with a misfire?

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2018 Nismo - Z1 Cold Air Intake, Z1 Silicone Hoses, Catalytic Converter Delete, Remark Axleback V1 Exhaust