okkayy quick question, My bud has a 88 cherokee just like mine, and his has over over 240k mikes on it, Could the fuel injectors be a reason it wouldent start??

 

i would look at other things first... ive never seen all injectors fail at one time

 

But lets sayy one or two injector go bad would it still start or not?

 

ya it should run. just run like ****

 

Id check the fuel pump relay before checking all the injectors, also cycle the key and have someone listen near the back of the jeep or listen closely and you should hear the fuel pump prime the system. If you dont hear any of that then check the relay/fuse and go from there.

 

The fuel pump is working perfect, It has spark, The engine is in time, and the dist is also in time, fuel is getting to to engine becuase we tested it, it has plenty of compustion, And it just doesnt want to start. One thing that kinda worries me is that he hasent changed his oil in about over a year, and he says that not a problem. Now tell me this if you run the engine HARD am talking about pulling a heavy *** trailer from washington to louisiana about once or twice, and he hasent changed the oil in forever couldent that mess up the rods or the valves. I mean if he ran it that hard, and dident change the oil that shoulda messed something up in the engine am talking bout internal damage?

 

lifters coulda went flat. oil will break down after a while change da oil its a good place to start

 

we allready changed the oil, was the first thing we did.
but when he trys to start it, it cranks with a loud knock coming from the back of the engine, it only knocks after a couple times of turning it not constant.