2G black smoke ?

[Inkdlyfe]

What all would cause black smoke ? I noticed it only really does it when I use 93 gas not 89 but I was told not to use 89 unless I had to but there really isn't much difference in proformance... Turbo 420a with 28psi of fuel 430 injectors I believe

 

[Inkdlyfe]

Ever thought of pulling the injector plug off of #4 when its running to see what kind of difference it makes. The CEL is trying to tell you something. You could do a cylinder drop test, pulling the injector plug off of each injector while it runs and record what the rpm drop is then move to the next cylinder and so on (something you would usually use an engine analyzer/osillascope to do but it still works the same). It would give you some feedback on what is going on.

So after unplugging the injectors they should all act the same when diconnected correct ? Like all should react the same and the one that dosnt is the one that I should focus on ?

And reply to the other I think it just drops the second the key is turnt off...

 

[ThunderChild]

So after unplugging the injectors they should all act the same when diconnected correct ? Like all should react the same and the one that dosnt is the one that I should focus on ?

And reply to the other I think it just drops the second the key is turnt off...

Yes, the one injector having issues will not change how the motor runs when it is disconnected most likely.

If the fuel pressure immediately drops to zero when you shut the car off, the injector is probably stuck open.