1991 Mazda b2600

Engine Performance problem
1991 Mazda b2600 4 cyl Four Wheel Drive Manual 206000 miles

ran good than it wouldnt start changed the computor and it ran fine again now 1year later tonight it wont start?
Mazda b2600
October 22, 2010.

Cranks but no start condition-do below to determine if it's a fuel or spark issue: Get a helper disconnect a sparkplug wire or 2 and ground it to the engine at least 3/16 away from ground -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if so, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.

Oct 24, 2010.