please help my brothers 1987 cherokee stalled the other day now it wont start havent don much yet. I have cheked for spark and fuel both are good. 4.0l buy the way

 

Going to need a little more info than that, will it still crank over? Or is it not even cranking?

 

it cranks but it dosent even sputter are nothing

 

cranks but wont sputter are nothing

 

Crankshaft sensor, ASD relay and 30 amp fuse (small and big). Check all those first. Probably a bad sensor somewhere.

 

Exactly how did you verify fuel and spark? The devil is in the details. It's important that you have a strong spark and that your fuel system can get up to a spec. fuel pressure for the engine to fire....

1. Check for QUALITY spark. You need a strong, blue, snapping spark. Yellow/orange/white indicates a weak spark which may not be strong enough to start the engine. A weak spark may be related to a failing ignition coil.

2. If spark checks out, (and only if) try a small splash of gas into the intake or a shot of starting fluid. If the engine starts and runs for a few seconds using this strategy, you have clearly identified a "fuel delivery" problem. For an 87, you need approximately 31 psi of fuel pressure at the fuel rail for the engine to start. Verify with a fuel pressure gauge, which can be rented from many big box parts stores.

 

ok thanks I have tested the spark and it is blue and snappy the fuel preasur is in specs I dont know much so please work with me guys I dont have much money so I have to try to fix it my self is there a way to test relays

 

Most relays in your box are universal. Swap the Aux fan relay with your ASD relay. Then check all your fueses (repalce if needed) and fire her up.