BLACK BLACK Spark plugs

[txstang84]

great googly moogly...i think we might need to bring daggar or jrichker into this one...

 

[Nottoofast50]

Well i guess i'm gonna put it all back together tommorow... what can i clean the carbon off the plugs with? or should i buy new ones, these are only a month old I'm hoping that some odd c hance the plugs where just carbon fouled to hell and the tfi was causing the problem but even after i replaced it the plugs where too far gone to run right....

 

[txstang84]

you could use a wire blush or a toothbrush and some solvent...

 

[Nottoofast50]

Oh I might also ad i ran the cylinder balance test with a code scanner and it came up number 4 bad everytime. :

 

[jerry beach]

Before you run the cylinder balance again, try and swap the injector plugs on #4 and the one next to it. If the problem stays in the same cylinder, it is mechanical. If it follows the plug swap its electrical.

 

[Nottoofast50]

Before you run the cylinder balance again, try and swap the injector plugs on #4 and the one next to it. If the problem stays in the same cylinder, it is mechanical. If it follows the plug swap its electrical.

Wouldn't that cause the car to miss really bad?

 

[87'GTstang]

Wouldn't that cause the car to miss really bad?

This is exactly what I would recommend. It's a common trick in the world of fixing cars, you swap a known good parts for a possible bad part and see if it goes away or not.

In other words, you swap the #4 injector with say the #3 injector (since they are side by side on the passenger bank). Then re-run your engine and check the balance test. If you are still getting that #4 is bad, then it is a mechanical problem, BUT if the problem moves to #3, then you have a bad injector - so replace it.

How does it respond in the higher rpm range, or does it just get worse from idle up?

 

[txstang84]

This is exactly what I would recommend. It's a common trick in the world of fixing cars, you swap a known good parts for a possible bad part and see if it goes away or not.

In other words, you swap the #4 injector with say the #3 injector (since they are side by side on the passenger bank). Then re-run your engine and check the balance test. If you are still getting that #4 is bad, then it is a mechanical problem, BUT if the problem moves to #3, then you have a bad injector - so replace it.

How does it respond in the higher rpm range, or does it just get worse from idle up?

good call-wish i would've thought of that, but i think he mentioned something about that all the plugs were heavily soot fouled...does this play into the just one bad injector if all of the plugs were sooted out?