wahmyhands Posted December 29, 2010 Share Posted December 29, 2010 My '83 GL Wagon was running great then recently it's started having a jumpy rpm needle. The needle jumps from normal rpms to almost redlining the needle either stays high or drops back down and still jumps just at lower rpms. She is shifts gears fine, so I'm at a loss as to whats wrong. Suggestions? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted December 29, 2010 Share Posted December 29, 2010 The shaft bushings in your distributor have too much play. Either replace them, replace the distributor, or have it rebuilt. GD Link to comment Share on other sites More sharing options...
beataru Posted December 30, 2010 Share Posted December 30, 2010 Is this the same for a gl-10s digi dash? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted December 30, 2010 Share Posted December 30, 2010 Unlikely unless the GL-10 is a carb or very early turbo ('85/'86). It's probably grounding issues with the digi-dash. The bushing wear on the earlier designs causes issues with the reluctor gap and makes the coil fire more rapidly even though the engine is not spinning that fast - this makes the tach signal (which is just the ground signal from the negative side of the coil) more rapid and thus the faster tach reading. When they get real bad it will read many thousands of RPM faster than the engine is spinning and will cause preigntion issues and may even make it undriveable. GD Link to comment Share on other sites More sharing options...
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