tach is fluttering
12-10-2004, 05:20 PM
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tach is fluttering
I have 1990 454's with thunderbolt ignition. I put new v.d.o gauges in and one jump's around anything under 2000 r.p.m above it is fine. I switched tach's from port to starboard and get same results with both tachs. does the tach pickup from the coil or the ignition module? Thank's for any imput.
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12-11-2004, 06:27 PM
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Re: tach is fluttering
I had the same problem with a pair of 525Sc's , I found the rotors were loose on the dist shaft. Merc says to locktite the rotors on. let set for 24 hrs. this fixed mine. good luck.
12-12-2004, 08:22 AM
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Re: tach is fluttering
I have a single SBC in a Volvo Penta boat and had tach jumpping all around and traced it back to a poor connection. I dunno if it was at the tach, the engine connection or the coil. I cleaned all of them and it fixed it.
12-12-2004, 08:26 AM
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Re: tach is fluttering
Originally Posted by mneal
I have a single SBC in a Volvo Penta boat and had tach jumpping all around and traced it back to a poor connection. I dunno if it was at the tach, the engine connection or the coil. I cleaned all of them and it fixed it.
