Jumpy Tach - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Dream240 · 02-10-2010, 09:22 AM

Okay, well the first gremlin since my car is back on the road is a jumpy tach.

It was working fine until a few days ago then it started operating about 500 rpms higher than normal. Then suddenly it just started jumping all over the place.

Well I had a spare so I swapped it out last night. Now it's steady on acceleration and idle, but it drops suddenly on decelleration. If I sit and rev it, it takes a few sudden drops from 4500 to idle speed. But once it's at idle it's fine, and the gauge is actually reading the correct rpms.

Any thoughts? Could I have a damaged/loose ground or worse....the ECU? I don't have any other problems with the car other than a bad alignment.

Thanks in advance guys.

02-10-2010, 09:22 AM	#1
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Jumpy Tach Okay, well the first gremlin since my car is back on the road is a jumpy tach. It was working fine until a few days ago then it started operating about 500 rpms higher than normal. Then suddenly it just started jumping all over the place. Well I had a spare so I swapped it out last night. Now it's steady on acceleration and idle, but it drops suddenly on decelleration. If I sit and rev it, it takes a few sudden drops from 4500 to idle speed. But once it's at idle it's fine, and the gauge is actually reading the correct rpms. Any thoughts? Could I have a damaged/loose ground or worse....the ECU? I don't have any other problems with the car other than a bad alignment. Thanks in advance guys. __________________ Don't mess with my monkey...he's loaded.