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Old 08-10-2015, 03:02 AM   #1
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jumpy tach

hey guys, my tach is getting jumpy at over 2500-3000 rpm. when the car is cold it seems to be ok but the as it warms up it starts messing up. as i accelerate it starts out smooth but then once it gets higher rpm it will start jumping up like pauses for a quick second then jumps to the motor speed, then does it again. it also will do this as i decelerate. it seems to be ok at low rpm and climbs/falls smoothly when cold. where do our cars get the signal from? i do have a new coil pack installed in case its built into the pack.
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Old 08-10-2015, 03:18 AM   #2
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Did you check the plugs?
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Old 08-10-2015, 03:19 AM   #3
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And cops
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Old 08-10-2015, 08:02 AM   #4
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The engine runs smooth. Its just the electrical with the tach. No cops. But the ignition components are all less than 2 months old
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