Tachometer "sticking" w/ engine noise - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

swami · 09-01-2015, 01:56 PM

Hi folks! First time posting here since my introduction post.

I just purchased an unmolested '97 that needs some TLC in a couple of areas. Nothing too crazy, but this one thing has me a bit confused. Check out this youtube video:

The tach appears to be "sticking" between 2500 and 3000 rpms. I have heard of the infamous s14 tach issues, but i'm also hearing a sound from under the hood that sounds like a rattling heat shield, and this sound only seems to happen during those moments that the tach is sticking.

I'm not convinced that there is a cause/effect relationship between these two things though. I have a friend coming over to help me poke and prod, but I thought i'd see what the community has to say, in case this is a common thing. Any ideas?

swami · 09-01-2015, 04:24 PM

update... the rattle was simply the exhaust splash shield. So yeah i'm assuming this is just a wonky tach.

OutlawLui · 09-01-2015, 04:32 PM

could be a lot of things.

tranny sensor/ signal wire/ cluster itself

swami · 09-01-2015, 06:46 PM

tranny sensor would only affect the speedometer though, right? Doesn't the tach get signal from the from the low voltage side of the coil?

OutlawLui · 09-01-2015, 07:03 PM

Oh my bad brain fart. Yea that speed sensor would be for the speedo

09-01-2015, 01:56 PM	#1
swami Join Date: Aug 2015 Location: Portland area Age: 47 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	Tachometer "sticking" w/ engine noise Hi folks! First time posting here since my introduction post. I just purchased an unmolested '97 that needs some TLC in a couple of areas. Nothing too crazy, but this one thing has me a bit confused. Check out this youtube video: The tach appears to be "sticking" between 2500 and 3000 rpms. I have heard of the infamous s14 tach issues, but i'm also hearing a sound from under the hood that sounds like a rattling heat shield, and this sound only seems to happen during those moments that the tach is sticking. I'm not convinced that there is a cause/effect relationship between these two things though. I have a friend coming over to help me poke and prod, but I thought i'd see what the community has to say, in case this is a common thing. Any ideas?

09-01-2015, 04:32 PM	#3
OutlawLui Zilvia FREAK! Join Date: Apr 2011 Location: Anaheim CA Age: 37 Posts: 1,491 Trader Rating: (19) Feedback Score: 19 reviews	could be a lot of things. tranny sensor/ signal wire/ cluster itself __________________ .

09-01-2015, 07:03 PM	#5
OutlawLui Zilvia FREAK! Join Date: Apr 2011 Location: Anaheim CA Age: 37 Posts: 1,491 Trader Rating: (19) Feedback Score: 19 reviews	Oh my bad brain fart. Yea that speed sensor would be for the speedo __________________ .

09-01-2015, 04:24 PM	#2
swami Join Date: Aug 2015 Location: Portland area Age: 47 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	update... the rattle was simply the exhaust splash shield. So yeah i'm assuming this is just a wonky tach.

09-01-2015, 06:46 PM	#4
swami Join Date: Aug 2015 Location: Portland area Age: 47 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	tranny sensor would only affect the speedometer though, right? Doesn't the tach get signal from the from the low voltage side of the coil?