got a bouncing tach
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
The IPC has a single ground ... so all of your gauges would "bounce" together if the ground was bad.
The IPC receives the engine speed signal on a white wire (circuit 121) which is pin A17 on the wiring connector to the IPC.
Does your car have a HUD ... If so, is the tach dispaly on that correct ?? If itt is then your IPC needs to be serviced as the tach is bad.
http://www.paspeedo.com can service it.
The IPC receives the engine speed signal on a white wire (circuit 121) which is pin A17 on the wiring connector to the IPC.
Does your car have a HUD ... If so, is the tach dispaly on that correct ?? If itt is then your IPC needs to be serviced as the tach is bad.
http://www.paspeedo.com can service it.
Thread Starter
Melting Slicks
Joined: Jan 2008
Posts: 2,527
Likes: 364
From: NSL UT
The IPC has a single ground ... so all of your gauges would "bounce" together if the ground was bad.
The IPC receives the engine speed signal on a white wire (circuit 121) which is pin A17 on the wiring connector to the IPC.
Does your car have a HUD ... If so, is the tach dispaly on that correct ?? If itt is then your IPC needs to be serviced as the tach is bad.
http://www.paspeedo.com can service it.
The IPC receives the engine speed signal on a white wire (circuit 121) which is pin A17 on the wiring connector to the IPC.
Does your car have a HUD ... If so, is the tach dispaly on that correct ?? If itt is then your IPC needs to be serviced as the tach is bad.
http://www.paspeedo.com can service it.
01 z06 so no HUD, and it is bouncing independent. it is works normal most the of the time, then it will take a couple of hops. engine stays smooth.
Advanced
Joined: Jan 2008
Posts: 85
Likes: 0
From: Tennessee
Could it be an alternator going bad?
I know it is not the same vehicle but when a bouncing tach occurs in a Land Rover DII it usually means that the alternator is not performing 100% as is on it's way out.
I know it is not the same vehicle but when a bouncing tach occurs in a Land Rover DII it usually means that the alternator is not performing 100% as is on it's way out.
