zxjuiced Posted June 27, 2006 Share Posted June 27, 2006 1980 280ZX EFI......Well here`s the problem! I`ll be cruisen in 5th gear, and all of a sudden the tach drops to zero, then bounces back! it does`nt even give you time to get out of the throttle and it bounces back on! It`s like someone just killed the power! it usually comes back on as fast as it shuts off! sometimes it does`nt bounce right back and I have to just hit the key and it fires back up! or once in a while, you`ll be sitting at a redlight and it just shuts off! you turn the key and it starts right up! WHAT GIVES?? I know it going to strand me somewhere soon! any advise??? Quote Link to comment Share on other sites More sharing options...
olie05 Posted June 27, 2006 Share Posted June 27, 2006 I had a problem like that twice: once was when I was autoxing and the tach would drop for a split second, ad the engine would keep going. Turned out to be my fusible links were going. (don't know if you have that on your zx) another time was when I had fried my voltage regulator jumping another car's battery. That was when my engine would shut of kind of randomly at a stoplight. Quote Link to comment Share on other sites More sharing options...
Phyxius Posted June 27, 2006 Share Posted June 27, 2006 sometimes a bad ground will do that same thing... Quote Link to comment Share on other sites More sharing options...
aarang Posted June 27, 2006 Share Posted June 27, 2006 Could be a bad ignition module and/or coil. You could buy a GM Hei 4-pin module for $25 and replace the old IC module. I recently did this to my N/A 1980 280ZX when the module went bad. Cheap and works great! Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted June 28, 2006 Share Posted June 28, 2006 I've had this problem many a time on a ZX. The first thing it was the GM HEI ignition I used would heat up and cause it to die at low RPMs, like less then 2000rpm, unless I gave it a rev and just threw it into drive-it would die. I ended up bolting the module to a piece of aluminum, then mounting it behind the headlight. The second cause was a bad ground, but that would happen only if I took a hard right turn, not left. ONLY RIGHT. I highly doubt this is your problem though, seeing as how its on the highway and I don't think you'd be making a hard right turn. Quote Link to comment Share on other sites More sharing options...
big-phil Posted June 28, 2006 Share Posted June 28, 2006 my car runs fine, but when the motor is cold the tach bounces all around. But I don't feel anything in the motor it keeps on running smooth just the tach is jumping around? Quote Link to comment Share on other sites More sharing options...
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