Has anyone ever seen this before?

[amnash]

heres a couple videos of what happening to my rpm gauge. its like it possessed or something. just wondering how i can fix it up. gets annoying on long drives.

its a hcr32 with rb25 neo swap but it used to happen with the rb20 also. where is the transmitter for this gauge? does the ecu just send the signal it gets from the CAS?
PS: it took for ever to actually catch this on camera lol

[mightyrocker]

lol story of my ******* life. every skyline i have had did this. And my '33 currently does this... I'm so happy this problem finally comes up on GTRC.. I thout i was cursed.....


it continued throughout me swapping the cluster AND the engine. Changing the CAS does not help. nor does getting a new ECU

I see your oil pressure gauge is also killin' it

[Skym]

I would think a problem with connection on back of dash to pinouts on ECU plug. Seen it not working at all on a Silvia and that's where it comes from (or bad solder problem). Easy to see in back of a manual, harder to trace on a car.

Another common known problem is speedo cable pushing against dash and causing a bearing failure problem in dash. Custom speedo cable, new bearing inside dash are needed. The speedo needle slightly going up and down and not being steady, clicking bearing type of sound from dash gives it away.

[Rush_in]

Skym, is there anything you do not know?

[fullthrottle]

Its the rpm output at the ecu pinout. It does it even in my 240Sx!

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[Nvdgtr]

Im sorry i laughed when i seen this, its like ur rpm gauge is special. lol i donno why but i laughed. seems like ur cars running fine tho.. maybe just need a new cluster?

[amnash]

lol story of my ******* life. every skyline i have had did this. And my '33 currently does this... I'm so happy this problem finally comes up on GTRC.. I thout i was cursed.....


it continued throughout me swapping the cluster AND the engine. Changing the CAS does not help. nor does getting a new ECU

I see your oil pressure gauge is also killin' it

ya the rb25 didnt have a spot for the r32 oil pressure sender. i think the r34 had a mechanical oil pressure gauge.

[mightyrocker]

Its the rpm output at the ecu pinout. It does it even in my 240Sx!

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does it get corroded or severed at the harness? Or is it internally in the ECU?

[bignate]

seems as though you have a short to power at some point on the tach circuit. Could be internal in the ECU, in the wiring, at a connector, or in the cluster.



check for obvious shorts first.

Pin 7 on the ECU harness is your tach signal so maybe disconnect your cluster and idle with a multi meter connected between pin 7 and ground and see if you get any weird voltage spikes. If you do you know the problem is internal in the ECU. If not the short to power is further along the circuit.

[Dragon Humper]

That's exactly what I was thinking. You are getting a errant voltage source from some where, start at the back of the cluster and work your way back to the source of the tach signal (ignitor isn't it?) with a DVM. Have fun......


Jon.

[Skym]

Skym, is there anything you do not know?

Heaps I do not know.

But learning new things everyday from older people that know way more than I do.

[Rush_in]

im very envious of you Sky knowledge

[fullthrottle]

No the.wire is just loose at the ecu. the pinout is loose

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[amnash]

so anyone with this same issue ever find the problem??

[amnash]

Its the rpm output at the ecu pinout. It does it even in my 240Sx!

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dont think so... rpm in nissan data scan stays perfect when the gauge is spiking. so the rpm signal from the ecu "should" be ok.. im thinking on just running three knew wires to the back of the cluster for the tach.. its only ignition, ground, and tach signal... i tried the stuff in these two links accept i didnt resolder the tach becasue ive tried two different clusters..

http://www.skylinesaustralia.com/forums/topic/144131-how-to-fix-tacho-r33-maybe/

http://www.youtube.com/watch?v=0MpEN2dpBFk

im gonna remove tach from cluster and just wire it up with new wiring like i said and see if the problem is gone. if it works ill tuck it all tidy and put some quick disconnects at the cluster. wont get around to it until winter time now though