Question about 1992 Oldsmobile Achieva

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92 Olds Achieva, Speedometer & Tachometer indictors spike

They spike at the same time and then settle back to normal operation. Check engine light goes on and off intermittenly. Check engine light does go off at low rpms but comes back on at highway speed or sometimes with just a little acceleration. Can't seem to duplicate codition as it appears random. There are no codes.

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  • Oldsmobile Master
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Have charging system checked, especially alternator.

Posted on Dec 12, 2008

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1 Answer

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Why does the tach and speedometer now spike when starting engine?


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97 Olds Achieva starts, then dies, gages crazy,then stop working


Brakes don't work when I try to stop while making a right turn.

Mar 04, 2010 | 1997 Oldsmobile Achieva

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1996 olds achieva check engine light remains on. Already replaced both oxygen censors and catalytic converter but the light remains on. Scan tool was placed on the o2 censors but it show "no activity".


What were the codes??? 
Try this, turn the ignition key to the on position and pull the ECM fuse out for 10 seconds, then place it back in and start the car.
The car may stall and let it, just restart it the second time and things should be fine. It's just the ECM leaning the Engine and Transmission. 
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Re scan and replace or repair fault in drive train  system.

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The tachometer on my 92 Honda Prelude Si works but the factory speedometer isn't whatsoever.


Its probably your speed sensor mounted on the back side of your transmission on top of the final drive gear. Its the sensor/plug located just under the shift linkage. Make sure its bolted down tight and check for any loose connections.

Apr 28, 2009 | Honda Prelude Cars & Trucks

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