Engine choke and make noise if the Engine Oil is low. of if you got bad gas...
Usually injector seals on these engines, Unfortunately you will need to change injector pipes as well.
to tell what injector is bad when engine is running slowly open the injector line to each injector if the engine stutters then the injector is good if it has no difference then it most likely is bad i had a injector that stayed open completely and you could hear a popping noise because it was pushing air back into the system!! good luck!
its the needle valve inside the injector opening and closing
If its gasoline it would be a problem in your head causing the piston to slap against the cylinder walls. If its a diesel engine then the knocking is caused by the .001 to .002 second delay between the fuel injector closing and the compression/combustion of the fuel
cold engine
A crackling sound from the engine could be caused by issues such as a faulty spark plug, a clogged fuel injector, or a problem with the exhaust system. It is important to have the engine inspected by a mechanic to determine the exact cause of the noise.
I get knocking & ping noise coming from the fuel injectors
If the 1999 Suburban noise is a sort of loud banging noise, the problem could be that the engine have jumped time. Jumping time would cause the noise and jerking in the engine.
because of the choke,as a result of eddy currents in the choke whick has lost its lamination
Noise pollution would be one.
why is there squeek noise when starting and then goes away when engine warms up
there is a certain tool that will detect a small vibration. check each injector with this. no detection will determine the faulty injector IT WILL TELL YOU. no it wont tell you. take a long screw driver, and put the metal end on the top of the injector with the engine running. if you hear a small clicking noise, then it is working properly. make sure you check all 4 injectors