Why does my needle move up and down by itself at idle?
Why does my needle move up and down by itself at idle?
This morning while I was warming up my car I noticed that the needle on my tach would sometimes move by itself. Especially when I apply the brake or if I slightly touch the gas pedal I noticed that the needle on my tachometer would rise a few lines above the 1K RPM line then drop back at the 1k rpm line, or a few lines below it. What could be the problem with my car? thanks in advance...
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hachibroku
- Posts: 193
- Joined: Sat Oct 30, 2004 1:10 pm
- Car: 98 240sx s14 MO Betta
Re: Why does my needle move up and down by itself at idle? (VinceSez)
i believe it has to do with the vacuum of the engine and stress on the engine. when you apply the brakes the brake booster is being used and it operates on vacuum. when you turn the steering wheel it creates stress on the motor causing the idle to fluxuate. they shouldnt fluxuate to much but a little bit is normal
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slc240sxse
- Posts: 125
- Joined: Sat Jul 03, 2004 10:35 am
- Car: 96' 240sx SE
Re: Why does my needle move up and down by itself at idle? (hachibroku)
Well, I have a 96 Se, and I have had the same problem for months, maybe even years now. My tach bounces all over, and sometimes doesn't work at all. I was told here that it is the step motor going out in the actual tach. Nothing to worry about really, you will more than likely have to replace it, like i will.
Hope this helps.
Hope this helps.