I have a b2600i, pulling each plug wire causes no change to r.p.m. on cylinders 3 and 4. 150 lbs. compression all cylinders. New fuel filter, plugs, wires, rotor and cap.
What is your question?
Just bought truck, but was told this power loss happened quickly. All I replaced was the mismatched set of plugs with new correct.
RepairPal Certified shops can diagnose and repair your 1993 Mazda B2600. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Not noticeably.
Since the injectors fire in pairs, 1 and 3, 2 and 4, I pulled all injectors, figuring two (3 & 4) were bad. Hooked an electric fuel pump to each injector in turn, pumping injector cleaner through them, when power was applied to the injector terminals.
With the coil lead disconnected, all fired while secured into the fuel rail and fuel pump hose attached, off the engine, with the pigtail attached to each and plugged into wiring harness, while spinning the engine.
Now no start, have spark, plugs wet.
Not noticeably. Since the injectors fire in pairs, 1 and 3, 2 and 4, I pulled all injectors, figuring two (3 & 4) were bad. Hooked an electric fuel pump to each injector in turn, pumping injector cleaner through them, when power was applied to the injector terminals. With the coil lead disconnected, all fired while secured into the fuel rail and fuel pump hose attached, off the engine, with the pigtail attached to each and plugged into wiring harness, while spinning the engine. Now no start, have spark, plugs wet.