Connor280ZX Posted February 1, 2013 Share Posted February 1, 2013 I've been having this annoying misfire with my car for a few months now. I first noticed the misfire when i installed a performance catback exhaust system in the car. Its not like a loud bang or pop, but its like a bubbly/boiling sort of sounding misfire. During idle, it runs fairly smooth, misses slightly, and surges up and down between 700-850rpm. When i accelerate the engine misfires as the tach climbs. When decelerating, a /rumbling/popping sound occurs. Pretty much the only time i notice the engine NOT misfiring is when accelerating hard. Heres the work ive done already to try and fix this: Replaced o2 sensor, Cleaned AFM, Replaced Master Vac lines, replaced PCV valve, and retimed the ignition. Heres other engine work ive done to my car since i bought it: Replaced Spak Plugs and Plug Wires, Distributor Cap and Rotor, Fuel filter, Fuel Hoses, and the Air Filter. BTW Car is in need of valve adjustment. Car Specs: 1982 280ZX N/A 62,781 Miles. Car was found sitting in a garage unused since 2005 by second owner. EVERYTHING on the car was original down to the Tranny Fluid. Mods/Upgrades: K&N Air Filter (Stock Intake), Crane PS20 Ignition Coil, and MSA Catback Exhaust with Summit Racing Muffler. Quote Link to comment Share on other sites More sharing options...
280zex Posted February 1, 2013 Share Posted February 1, 2013 Might have a bad injector/sticky injector. Also check the injector seals in the intake manifold, they can go bad and dry crack. Quote Link to comment Share on other sites More sharing options...
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