Tach needle bouncing (not idle related this time)
Thread Starter
Supreme Member
Joined: Nov 2003
Posts: 3,383
Likes: 0
From: surrey b.c. canada
Car: 89 Iroc
Engine: lb9
Transmission: wc t-5
Axle/Gears: 10 bolt 3.08 posi
Tach needle bouncing (not idle related this time)
my tach needle keeps bouncing when i'm driving, and its not idle related, any ideas how to fix it?
Senior Member
Joined: Oct 2004
Posts: 575
Likes: 1
From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
How much is it bouncing?
My tach was doing the same thing, 3-500 rpms. I replaced my spark plug wires with a higher quality 8mm set, I had el cheapo stock replacement 7mm wires installed. Now the tach is nice and steady. I guess the cheap wires were leaking and interfering with the tach signal from the coil.
My tach was doing the same thing, 3-500 rpms. I replaced my spark plug wires with a higher quality 8mm set, I had el cheapo stock replacement 7mm wires installed. Now the tach is nice and steady. I guess the cheap wires were leaking and interfering with the tach signal from the coil.
Senior Member
iTrader: (1)
Joined: Jan 2004
Posts: 936
Likes: 0
From: UofA(Tucson), AZ
Car: 92 Precision Red Firebird
Engine: v6->357 vortec xe262h rpm intake
Transmission: t5-> t56
Axle/Gears: 10bolt 3.42s
yea mine did it too like really sparadicly! but it stopped...cause i used the Fonze technique( hit the top of the dash pad and say hayyyyyyyyy.....)
Member
iTrader: (1)
Joined: May 2004
Posts: 143
Likes: 0
From: Miami, FL
Car: 1988 Pontiac Trans Am
Engine: 383 Stroker
Transmission: T-5
Axle/Gears: Borg Warner 9-Bolt, with 3.42 Gears
If it is doing it while your driving then it is probably the coil mine was doing it and when i changed the coil it was fine. If it is doing it at idle it might be the spark plug wires.
Member
Joined: Sep 2003
Posts: 125
Likes: 0
From: Rural Hall, NC
Car: 1989 RS
Engine: 2.8L MPFI Bored 30 over (Rebuilt DEC 2004)
Transmission: 5 - SPD With 3.42 open rear end
Mine started doing that and the alt was going bad, make sure you have enough power for everything.
-Buck
-Buck
Thread
Thread Starter
Forum
Replies
Last Post
eightsixseven
Tech / General Engine
2
Dec 16, 2024 01:50 PM
theshackle
Tech / General Engine
4
Sep 17, 2020 08:26 AM
