Tachometer gauge issue
Thread Starter
Pit Crew
Joined: Mar 2013
Posts: 207
Likes: 2
From: Ont, Canada
Tachometer gauge issue
Hi guys,
Went out for a drive yesterday on the highway. As I was going on the onramp and accelerating, the tachometer gauge violently jumped up from 2.5K to 3.5K RPM bounced around a bit. Was scared that I had the transmission 'flare' problem, but the tranny felt smooth as per normal.
Now my tach gauge 'bounces' and seems to be inaccurate from what the engine RPMs are really doing. Seems to be a margin of error of 10-30% over the normal RPMs.
Also when I let go of the gas, the gauge takes a while to fall and sort of floats until it finally recesses to the proper RPM level.
Anybody have any ideas? Does anyone have a servicing manual where there is a reset procedure or something? I don't feel like shelling $1K+ to change the instrument cluster....
Thanks!
Went out for a drive yesterday on the highway. As I was going on the onramp and accelerating, the tachometer gauge violently jumped up from 2.5K to 3.5K RPM bounced around a bit. Was scared that I had the transmission 'flare' problem, but the tranny felt smooth as per normal.
Now my tach gauge 'bounces' and seems to be inaccurate from what the engine RPMs are really doing. Seems to be a margin of error of 10-30% over the normal RPMs.
Also when I let go of the gas, the gauge takes a while to fall and sort of floats until it finally recesses to the proper RPM level.
Anybody have any ideas? Does anyone have a servicing manual where there is a reset procedure or something? I don't feel like shelling $1K+ to change the instrument cluster....
Thanks!
Last edited by iceblast; Mar 18, 2014 at 11:43 AM. Reason: More info added. 3.5K RPM was more like it.
Pole Position
Joined: Jul 2011
Posts: 371
Likes: 12
From: BC
Any warning lights? I'd be surprised if it's a cluster issue.......but it could be an engine speed signal problem. I don't understand your concern about 2000 -2500 RPM during the accel onto the highway? If the tach is not going to zero during the "bouncing" it sounds like it could be actually "hunting" and the slow decel of the RPM when you let off on the throttle could be genuine. Take it somewhere and get it diagnosed with the use of a scantool.
Thread Starter
Pit Crew
Joined: Mar 2013
Posts: 207
Likes: 2
From: Ont, Canada
Any warning lights? I'd be surprised if it's a cluster issue.......but it could be an engine speed signal problem. I don't understand your concern about 2000 -2500 RPM during the accel onto the highway? If the tach is not going to zero during the "bouncing" it sounds like it could be actually "hunting" and the slow decel of the RPM when you let off on the throttle could be genuine. Take it somewhere and get it diagnosed with the use of a scantool.
Even now, the needle looks like it 'loosely' connected to the real RPM signal values. Maybe a bad ground or signal? It is only isolated to the tach and not the speedo.
I want to grab an OBD off someone and run it to see if it matches or it is indeed the cluster.
Last edited by iceblast; Mar 18, 2014 at 11:44 AM. Reason: Answered orignal question of quote.
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