#4 refuses to fire

[thrashmongrell]

91 nissan 240sx, 177,000 miles.. my number 4 cylinder isn't firing for some reason, the leads are fine, timing it's getting spark plus and I checked the compression, also the injectors seem to be working, all other cylinders work great, just need #4 too.

[benemorius]

I didn't quite follow all that. You say the #4 spark plug is firing? The #4 injector is spraying? And you have good compression on the #4 cylinder? How can you tell the cylinder is dead?

[NISTECH]

did you pull the plug out ,attach it to the end of the plug wire,ground the body and watch it spark as you cranked the motor?

What was the compression on that cyl?

how did you determine the injector was firing? node light? stethescope?

[thrashmongrell]

It turns out it was the injector, it worked just very poorly... to check if the cylinder worked I just removed the spark plug lead and there was no power loss, plus it was very apparent while driving and yes I did ground the plug and crank it to check for spark.