I have a 1991 Firebird 3.1L V6. I've posted on this board about several problems. Yesterday I found something new.

As it turns out, only 2 of the spark plugs in my engine are becoming fouled. They are the two closest to the front of the car on the drivers side.

There has also been a loud knock in the engine since right after I bought it back in November.

I have been told bad injectors can cause knocking. I am nable to tell where the knocking is coming from. Motor honey/oil stabilizer did not help the knocking.

Now, assume I don't know jack squat except the basics, and how to use tools. Someone please tell me what to go about doing to diagnose my problem. Think I should check the injectors? Well, how do I do that? Please be specific.

 

Well put a long screwdriver or stethoscope against the injector body and put your ear up to it and listen for a regular tick...if the tick is all over the place, or not there, but you can hear it on other injectors, then ya got a bad one....

Uhhhhm....you could try disconnecting the injector connection and plugwire to one of the bad cylinders at a time and see if the knocking changes or goes away.

 

Injector body?

 

Yeah....as in...the body of the injector. Not...the injector electrical connection, or...the fuel rail. Just put it on the injector!