Tach jumping around - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 6 (permalink) Old Dec 7th, 01, 12:47 AM Thread Starter
Join Date: Jun 2001
Location: ohio, U. S. of A.
Posts: 1

My 87 has an in dash tach and at times it jumps around. It seems to jump up in rpm like something electrical is going on with it. Anyone know what might cause this? Thanks
mopfried is offline  
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post #2 of 6 (permalink) Old Dec 7th, 01, 05:02 AM
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Join Date: May 2000
Location: Westlake, OH 44145
Posts: 707

bad ign wires!! Take a spray bottle and mix a little salt in with water and spray on wires. This will show a leaky wire.
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post #3 of 6 (permalink) Old Dec 9th, 01, 04:45 PM
Join Date: Dec 2001
Posts: 1

I had this happen all the time on my 87 z28. I turned out to be my pickup coil in the distributor. It normally wouldn't happen when the vehicle was first started. But after driving it for a while it would do it (inconsistenly I may add). It wasn't a "every time I drive" occurrence. Drove me nuts!!

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post #4 of 6 (permalink) Old Dec 10th, 01, 07:50 AM
Join Date: Oct 2001
Posts: 5

i have the same problem
what is a pick up coil
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post #5 of 6 (permalink) Old Dec 12th, 01, 06:54 AM
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Join Date: Sep 2001
Location: Yorkville In
Posts: 1,420

The P/U coil is inside the distributor you have to remove the distributor and disassemble it to replace coil it where your points use to be
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post #6 of 6 (permalink) Old Dec 14th, 01, 08:43 AM
Join Date: Dec 2001
Posts: 22

there is a question just like this in the MSD ignition search then go to popular hotrodding articles they have what everyone said and little more
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