Question about 1991 Mitsubishi 3000GT

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Tachometer failure (Rev counter)

Hi, since I had the delimiter fitted to my 1991 gto, the rev counter went dodgy and inconsistent before failing all together. Anyone have any ideas on what I can check the delimiter wires all look perfectly ok from what I can see. They were wired into the gearboxc sender unit.

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  • iceman_ii May 11, 2010

    You are confusing me a bit when you call it a "rev counter" The gearbox sending unit is for the speedometer, not the tach, the tach signal is picked up at the coils/PTU.

    And what do you mean by a "de-limiter" Is it something that gets around the redline limit (which is both not a good idea on a stock engine, and is done internal to the ECU) Or is it something that gets around some kind of limit on the top speed (if it hooks into the speedometer sensor, this is my bet)

    I wish I could help more, but without clarification, I can only shoot in the dark.

    iceman_ii on



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SOURCE: how to fit a crank sensor to a 1991 GTO twin turbo

Take off Drivers side wheel, remove plastic inner fenders (two pieces - one has six screws and the other is held in with two 12mm bolts - one is hidden up front behind the first plastic cover you remove). Relieve tension from A/C belt (slacken centre nut on tensioner and then using a 12mm ratchet wrench, crank the tensioner in), relieve tension on power steering belt (loosen both bracket bolts and then remove the outer bolt and slide pump up on the arm), place 22mm deep socket on crankshaft pulley and wedge breaker bar on the frame (to the front of the car) and then crank the engine to break the centre bolt. Relieve tension on Timing belt. Remove the crankshaft pulley and tensioner, the crankshaft sensor is located behind the crankshaft pulley. Installation is the reverse of removal, except you have to make sure you put the timing belt back on exactly where it came off (mark the belt and toothed pulley before you pull the belt off) AND you have to pop the tensioner back on so it has the same tension as when you started (the tensioner pops into itself and is spring loaded, held in place with pin/panel pin/small nail while you're working it. Good luck. If you are lost on this, or are asking this because you aren't handy under the hood, leave it to a garage, you will do major damage to your car if you mess up the timing.

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SOURCE: tachometer guage wiring diagram for 4g63t

Go to the autogauge web site they might have a free downloadable instruction on pdf or html.

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