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Fuel in the injector harness can result in a short causing this code. The only way for fuel to be there is a leaky injector. Dry off harness and monitor. Even though the injector is new, it may be defective. The next place to look is the wiring harness itself. You will have to find where the wiring for #4 injector goes into the vehicles computer and perform a resistance test from the injector harness to the computer to make sure there is no high resistance/opens. If all checks out fine, the computer may be bad. VW computer failure rates are extremely low. I would concentrate on a wiring issue.
Normally we start with the basics, are the spark plugs firing and are the fuel injectors opening and providing fuel, and does the engine have compression. Also, are there any stored trouble codes in the computer? There is a relay that powers the injectors and fuel pump. You say you are getting fuel so we will assume that relay is ok. The crank or cam sensor could have failed, or a list of other things. You will need to figure out if you are lacking fuel or spark to the plugs to proceed.
Where i would start with the injectors shorting out may have shorted out your ecm " computer" This will cause Everything you listed. You can reset just need to contact dealer and find out you reset on this kind of vechical.But i would guess it's fryed with all the short's , Best of luck to you. I i can help any futher just ask, I'll do my best.
P0300 - Random / Multiple Cylinder Misfire Detected
Possible Causes: - Improper spark plug - Insufficient compression - Incorrect fuel pressure - The injector circuit is open or shorted - Fuel injectors may be faulty - Intake air leak
Possible Solutions: - Perform Injector Service - Replaced Spark Plugs - Replaced Injectors - Replaced Ignition Coils
P0301- Cylinder Number 1 Misfire Detected
Possible Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak at cylinder
Possible Solutions: - Perform Injector Service - Replaced Spark Plug #1 - Replaced Injector #1 - Replaced Ignition Coil #1
Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.
sounds to me that you need a computer since the injector gets its signal from the computer. You can get a noid light from auto parts store to test the wire attached to the injector. The light should flicker when cranking the car. No flicker chances are you need ecm.
honestly it sounds like you have a bad computer. there is a constant 12 volts going to each fuel injector and the computer momentarily grounds each fuel injector to activate, the black smoke is from too much gasoline and the missfire is probably from the injector either hanging open or being held open electricaly. next time it starts to missfire on number 1 cylinder try taking a stethiscope or long screw driver and put it on #1 fuel injector with the engine running and see if you hear a clicking sound. If not try unplugging the #1 Fuel injector. this won't fix the missfire but you can see if the black smoke clears up. if the smoke doesn't clear up with the injector unplugged and you are sure its # 1 cylinder thats missing, replace #1 fuel injector.
Check for any wiring pinch which might have occurred when the injector was replaced. The injector is driven directly by the computer, so it seems to point at the new computer as being faulty. (pulse signal is always 'on')
injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.