Hello friends,

I am in dire need of the knowledge and expertise from some of you members.

I have been having problems with my 91 GQ Patrol. It has been putting out much raw diesel smoke from the exhaust and has been knocking and clacking at higher RPM's. I was told to check the injectors first, so that is what I am going to do. It is definitely a problem with the injectors or fuel pump.

My mechanic told me I should change the nozzles or sprayers on the injectors and that would straighten out the problem. Another mechanic told me if we just change the nozzles and do not calibrate the injectors, that the problem may be even worse.

Do any of you have experience changing the nozzles on the injectors? What advice can you offer me in this situation? I love my Patrol but for the last 6 months or so I have had this problem and I need to get to a solution before I really damage the motor.

I thank you for sharing your advice and knowledge on this issue in advance.

Kristofer