doing a contribution test???
When doing the contribution test, is anything supposed to happen? Let me explain, I got my hands on a snap on older brick scan diagnostic tool.(my bosses) It works on my truck.(we dont use it much, quite often it does not read the customers car) Anyway, I did the buzz test and hear the noises as its supposed to. I then did the contribution test, the machine read if no results in 2 minutes see some appendix or call for help. I got results p0541 air intake heater. (i unplugged and removed it) So thats fine. I did not know if I should hear any noises or if the motor should run funny while the cylinders were being tested. Is this correct? Should i just get an injector code if one is bad? This is to old a machine to give me graphs or anything. It did state run the test when the motor is up to temp. I thought i was told on here from a tech try it cold in the am cause thats when i think my weak injector causes a driving vibration.
any imput appreciated