tach problem and ?
Thread Starter
Instructor
Joined: May 2010
Posts: 172
Likes: 3
From: Hesperia California
tach problem and ?
72/ tach slow to react and seems to be off 1500 to 2000 rpm, at idle showing 500-550, earlier the same day at idle 800-850 normal, at 70 should be around 3500+ m22 and 4.10s. I have checked the dizzy wire under the point plate and grounds to the vacuum advance base screw seams to be OK, tight and corrosion free, could the tach filter be bad ? I would like to replace it first before possibly having to rip in to the dash and send out for repair, any suggestions and where can i find a tach filter ? and will any year tach filter do the same or be the same THANKS for any and all advise, the more the merrier, I like lots of opinions helps me and others learn more every day. .......Garry 
Thread Starter
Instructor
Joined: May 2010
Posts: 172
Likes: 3
From: Hesperia California
tach ???
OK, Did not want to get panties in an up roar its for a 1972 z28, OH that's a Chevy by the way LOLOL, My heart steal beats for that next 69 big block that I will have soon I'm looking for the right one. At the moment my problem is the Tach on the z28, please don't thump on me to hard, there is to much good info and wise wrenchers in the corvette world, THANKS for any and all help .......................Garry
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
Your 1972 Z28 engine was originally built right in my area, at the factory where the current Corvette engine is produced. St.Catharines Power Train.
Anyway, is you have an HEI system on that car then check the tach filter first. That is the cheapest place to start.
Anyway, is you have an HEI system on that car then check the tach filter first. That is the cheapest place to start.
Thread Starter
Instructor
Joined: May 2010
Posts: 172
Likes: 3
From: Hesperia California
The dizzy is stock, points and all, Im going to delete the filter and see what happens and go from there thanks for the info. Every little thing helps................. Garry
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