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I just bought a '83 n/a zx and the engine runs strong and idles smooth, the only thing thats got me bothered is at idle and give it the juice, it hesitates for a second and sometimes you can hear a small backfire. I checked the cap and rotor, they look ok. I checked the plugs and they look ok....could it be the vacuum advance on the distributer lagging or is it something else worse. I can manually move the advance mech so I know its not stuck. Also I've noticed that when holding a speed, say 45 is seems to fluxuate like I'm moving the gas more and less. Its not much, but I notice it....then the other day I hit 73 and it did it real bad but not at 72 or 74....just right at 73 ????? The injectors make a clicking sound, is this normal or are they getting worn? According to the past records I got with the car, the injectors were replaced around 90K and it now has 148K. Could it be a bad fuel pump...I'd really rather not keep replacing things until it goes away. Any help to point in the right direction would be most helpful....
 

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Thats really odd i have a 83' n/a and mine does the same exact thing when revving it up from idle speed. and mine also fluxuates but at 80 mph not at 79 or at 81?
thats crazy huh?
about the hesitation i dont know whats wrong but if you press the gas smoothly yet quickly instead of punching it outright it should accel smoother.
if you get any help on the fluxuation email me and let me know what it is.
 

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Can we all say "welcome to the club". What you describe is common and has been talked about on this forum constantly. You can check the archives. Bottom line is that there is no one item that will answer this problem. Common issues are (in no apparent order) : vacume leaks, tps sensor, afm , any and/or all coollant sensors, corrosion of connectors, torn or crack afm to throttle body boot, etc etc etc. I've gone through most of checks but have yet to fix the issue with mine. If anyone could truely lock this issue down it would be amazing.
 

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Just a thought, but if you hear a backfire, my suggestion is to get your distributor timing checked at your local mech. or do it yourself, make sure with N/A's its set at 8 + or - 3, with turbos 20 + or - 3


Matt
 
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