aga

hey guys, a question! (no shit!) my car's rpm gauge (the dash one) started showing 500-1000 rpm more than real. i see on my commander that i have for example 1000rpm idle, and the dash says 2000...besides i can tell by the sound too. it happened before for a trip then straightened itself out. now here it is again. is it a cable , somewhere rubbing or something? i guess ecu to dash?

brndck

its not a mechanical tach. the instrument cluster gets a signal from the ecu.
the ecu gets a signal from the distributor if you have a KA, but seeing as you're in greece you probably have a CA or SR? the SR and CA use a cam angle sensor (cas).

are you using a power fc?

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aga

i have an s14 sr , with powerfc. by cable, i meant electrical cable. (you're used to calling them wires, sorry)

Sileighty_85

Probably the gauge itself. Pretty common for S14s to do that.

You can reflow the solder points on the back of the gauge that the screw go into in hopes that fixes it.

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1989 Built SR GT2871R -363whp
1998 S14 W/RB25- 250ish (For Now)
1986 SR86 - 200ish
1990 R32 GTR - 320hp
Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html
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aga

so , a broken soldering point could be the cause? i'll check it.

aga

driving home today i noticed a method to this madness...

the gauge rpm are twice the real ones!

1000 rpm = 2000rpm

3000, = 6000

my car is learning multiplication tables it seems.

zerodameaon

Hopefully it does not achieve sentience anytime soon.

Sileighty_85 knows his stuff here, he pretty much started the discussion on Zilvia of fixing the issue rather then replacing the tach.

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Need to adjust your idle?
http://zilvia.net/f/s-chassis/395413...-pictures.html

aga

if it does , its gonna thank me for saving her from the previous owner. yeah its certainly something wire-related, im gonna look into it after work, if they let me leave some decent hour...

coupesallday!

I tried soldering mine and it does not work. My gauge is still at 2k everytime I turn my car on instead of 1k but it's not really that high.

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aga

i removed the dash and resoldered everything behind the gauge.

i would say it did SOME difference,but not fixed it. now it sometimes works fine, sometimes x2 and sometimes something in between. i've noticed it jumping around while sitting at a traffic light. there's a big resistance behind the gauge, could it be knackered? should i try to replace that one? if that doesnt work i'm tossing it and replace it with a Koso motorcycle thingy, my mate's got one and it's excellent

aga

found the cause of my woes. there's a plug near the ecu at the passenger footwell that was loose. when you wiggle that, the rpm's bounce all over the place. tie wrap remedy, all ok.

Ayy_mo

glad to hear