Jumpy Tach - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

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post #1 of 2 (permalink) Old Mar 31st, 01, 02:49 PM Thread Starter
Senior Tech
Join Date: Jan 2001
Location: Raleigh, NC
Posts: 1,046

After switching from points to Accell Electronic distributor, my tach gets very jumpy above 3000 rpms. The tach is a Sun Super Pro II. I re-checked the wire connections and even ran the negative directly to the battery... It is still jumpy. The engine is a small block 350 ( bored 30 over ), headers, Holley Street Dominator Intake, Edelbrock 600 Perf Carb ... The coil is an also Accel. The car's performance is steady and solid ( a little slower since I took off Holley 650 DP, but I did it for all around driveability ). This is more of a nuisance than a problem, but I would like to get it solved... I did not have this problem with the points distributor ... I am not using the resistor since I put in the electronic distributor... A second question while I have you attention ... Who is a good source for source for info about hydraulic clutch conversions? I have a Muncie M20. The car is actually a 55 Bel Air, but this is the best Info Web Site going... And I do own a camaro... Thanks im advance for your comments and suggestions
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post #2 of 2 (permalink) Old Apr 1st, 01, 03:03 PM
Senior Tech
Join Date: Dec 2000
Location: Willow Park, Texas
Posts: 1,032

Which Accel Distributor do you have? Most of the time an eratic tach needle on an electronic dist. is caused by the tach wire (wire connected to the dist.) being run to close to the coil wire or other wire for a trigger system, This is caused by EMI (electro magnetic interference) from the wires and is picked up by the tach wire.
Check the routing of your wire, make sure it is not routed along or near any other ignition wires including plug wires.

67 CAMARO R/S CLONE, 355/turbo 350, 200hp NOS,12 bolt,etc...
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