Tacho/Stereo problem related?
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This is a discussion on Tacho/Stereo problem related? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I drive a 95 JDM GC8 that I've had for about 3 years now. Generally, my car runs well, but ...

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    Tacho/Stereo problem related?

    I drive a 95 JDM GC8 that I've had for about 3 years now.
    Generally, my car runs well, but from time to time small problems appear. At the moment I'm suffering from a bit of an electrical problem (actually, two problems that might or might not be related).

    1) First is the tacho. It's been playing up for quite a while now. Sometimes it works ok, but generally it is very inaccurate. It often seems to get stuck at around 2800-3200 rpm. As I accelerate or decelerate it moves up and down, but only between 2800 and 3200. At other times it moves properly up and down, but it shows a number that is about 500rpm higher than the what the engine is actually doing. Eg. I can hear and feel that the engine is doing about 1500rpm, but the tacho shows somewhere between 2000-2200.

    2) My stereo. Sometimes I'll be driving along listening to the radio and all of a sudden the stereo will beep, 'ACC' will flash on the display and the aerial will drop back into the car. Then a few seconds later it will beep again, the radio will come back on, the aerial will extend and everything is fine. For about 5 seconds, then the process will repeat. On, off, on, off - its very frustrating. This problem comes and goes. Sometimes I can drive 100 kms without it happening, and at other times at continues from start to finish of a drive. It seems to be particularly bad in wet weather.

    These two problems sometimes occur independently, but generally occur together.

    My thoughts: Initially I thought it might be a grounding problem that is affecting both the stereo and the tacho at the same time. A couple of weeks ago I cleaned up the grounding points (which seemed to help a little), and I installed the grounding kit mod (which also helped a bit). For a while the problems almost disappeared, then they returned (they now occur less often than they used to but they still occur).

    One more thing. Now that the snow had melted here and I'm back to driving fast I have noticed another problem. I seem to have lost a little power, both under regular acceleration and under turbo boost. It's small, and might not even be noticable to someone who doesn't drive the car everyday, but it's definitely noticable to me. Interestingly, when the tacho/radio problem disappears, the power loss problem also seems to disappear, so I'm thinking that they are all related.

    Sorry for the long post. Any help would be greatly appreciated.

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    Registered User Sarra's Avatar
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    Whoof. Sounds like something that would take a few hours or even days to figure out right.

    Buy yourself a digital Multimeter, and start checking the resistance in your grounding wires; check from the load to the negative terminal of the battery. Just a few ohms is good, a few kohms is bad.

    Also, make sure you're getting 13-14 volts to everything, whatever your battery puts out while your alternator is supplying power to it. Old corroded wiring will generate more resistance, new fresh wiring will have very little resistance.

    One thing I could suggest is take it to a dealer and get a brand new igntion. That might take care of the weird problem with your stereo.

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    Thanks for the reply. Electrical problems aren't really my specialty (I prefer mechanical ones ), but I think getting a multimeter and checking it all out is probably my best course of action. I'm not really familiar with the wiring structure of the car. Is there any specific area that I should start at, any specific area that is prone to wiring problems?

  5. #4
    Registered User Sarra's Avatar
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    Sorry that I can't help you with that, I'm not really farmiliar with the JDM WRX.

    I would start with any wiring that is in an area that would get wet when it rains, such as wiring that gets splashed from the tires. Check for rust and such. Start at the front and move back. Might help if you strip your interior out, and getting to stuff behind the dash will be a PITA.

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