Cranks but wont start - 1991 Plymouth Acclaim

To figure out if it is lack of spark or lack of fuel, spray some starter fluid into the throttle body and then see if it will start. If the engine tries to start and dies, then you know you have spark and no fuel. If it doesn't start, then you have no spark (and possibly no fuel either). I had this problem on my 90 Acclaim. I changed the Computer Module first and then the fuel shutdown relay second. Should have done the fuel shutdown relay first as it is the least costly and seemed to be what fixed the problem. Previously to changing these two parts, I changed the fuel pump, spark plugs, coil, rotor and cap, ignition switch, ignition module and spark plug wires with no results.

You need to check for spark at the plugs while cranking.then check for fuel entering the intake at the injectors.you don`t say if its a 4 or 6 cylinder.if its a 4 cylinder you can look into the throttle body while someone cranks the motor and you should see fuel squirting into the intake.if you have no spark then check to make sure the cap and rotor is in good condition and the rotor is turning(if not then the timing belt maybe broken and needs replacing.also check the plugs as if they are worn so bad you won`t get any spark.a common problem on these is the coil pickup in the distributor going bad.there is a 2 wire connector that comes out of the distributor with a plug,if you follow this wire back into the distributor you will see the pickup.also check and see if you can hear the fuel pump running while cranking,you may have a bad fuel pump.you may have to remove the gas cap and listen at the filler neck or listen under the car were the gas tank is.if the fuel pump is not running then you can hit the fuel tank in the middle while someone cranks the motor and it might start.if so then the fuel pump is no good another common problem.there is a fuel pump relay under the hood on the drivers side that sometimes goes bad or there is bad connections.most of this checking is good for the 6 cylinder as well except you can see the fuel squirting into the intake.it could also be a bad computer that will have to be checked out at a shop.