Tach Twitchin'
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Joined: Jan 2000
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From: Lee's Summit, MO
Tach Twitchin'
Only occasionally does this happen: I will be sitting at a light in drive, and the tach will start bouncing around, but the engine stays the same speed. It stops if you put it in neutral, and sometimes it will start again when you put it in gear. Any ideas what causes this?
Vman
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1989 Camaro RS
2.8 V6
K&N's
700R4 tranny
Cragar Street Pro rims (old Series 30)
Pioneer DEH-P3000
1969 Camaro SC
350 HO from a Vette
Turbo 350 tranny
In the process of being restored
Vman
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1989 Camaro RS
2.8 V6
K&N's
700R4 tranny
Cragar Street Pro rims (old Series 30)
Pioneer DEH-P3000
1969 Camaro SC
350 HO from a Vette
Turbo 350 tranny
In the process of being restored
Supreme Member
Joined: Jul 1999
Posts: 1,294
Likes: 1
From: was: Palmdale, Ca
Car: was: 1984 Camaro Z28
Engine: was: L69
Transmission: was: 700-R4
Check the connector on the back, behind the tach. It could be loose/dirty/or both. Also you may have a short/exposed wire somewhere.
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George P. Lara
1994 Z28 LT1 T56
1984 Z28 High Output
Member: SCCA, SCFB, SC3GFB
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George P. Lara
1994 Z28 LT1 T56
1984 Z28 High Output
Member: SCCA, SCFB, SC3GFB
Junior Member
Joined: May 2000
Posts: 7
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From: w.berlin nj usa
Same thing happened to me. It bothered the hell out of me. So how did I remedy it, well I pulled all the spark plug wires, and got a new set, then i tightened all my spark plugs. 2 were loose and I believe one wire was dead. Any who..... that fixed the problem and she has been running like a champ ever since.
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Supreme Member
iTrader: (10)
Joined: Jul 1999
Posts: 1,780
Likes: 2
From: Fla
Car: 90 IROC
Engine: 406
Transmission: GMPP 93/4L60
Axle/Gears: 9 bolt 3.27
MY car did that once.. there was a spark plug wire touching the header.
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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!
[This message has been edited by MikeH (edited October 05, 2000).]
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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!
[This message has been edited by MikeH (edited October 05, 2000).]
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V,
There is a possibility of interference from the ignition coil. There was a TSB regarding this from GM on some 'F' cars. /Try routing the tach wiring away from the coil as far as possible, or temporarily shield the wires wuth aluminum foil to test the theory.
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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0
There is a possibility of interference from the ignition coil. There was a TSB regarding this from GM on some 'F' cars. /Try routing the tach wiring away from the coil as far as possible, or temporarily shield the wires wuth aluminum foil to test the theory.
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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0
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Posts: 129
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From: Miami, Fl
I also read once where the seal in the bottom of the distributor (down by the gear) was worn and allowing oil to seep up into the distributor, and in certain situations, causing the problem you describe.
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Edwin
1986 IROC, 1992 Body Kit, 1989 5.7 IROC Engine, Crane Cam, 3" CVX Exhaust, ADS Superchip, 24# FoMoCo Injectors, Gutted Cat, AFPR (45 psi), Airfoil, 3.42 Gears, MAF Screens removed, Gutted Airbox, K&N Filters
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Edwin
1986 IROC, 1992 Body Kit, 1989 5.7 IROC Engine, Crane Cam, 3" CVX Exhaust, ADS Superchip, 24# FoMoCo Injectors, Gutted Cat, AFPR (45 psi), Airfoil, 3.42 Gears, MAF Screens removed, Gutted Airbox, K&N Filters
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