Hi everybody, this is my first post, so please bear with me. Just trying to fix the factory tach in my '85 LX Sedan. When the car is running, the tach is jumping all over the place (usually burying itself past 9,000 RPM!!), but everything else is running fine (the rest of the cluster still reads accurate). Where does the tach receive it's signal? Is it possible that this is a simple problem, because I really don't want to replace the entire cluster (my car is all original with only 169,000 kms!!) Help!
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Tachometer Not Working Right
Started by RYANDCOKE, Nov 14 2003 06:30 PM
8 replies to this topic
#1
Posted 14 November 2003 - 06:30 PM
#2
Posted 14 November 2003 - 08:02 PM
Make sure your plug wires are in good shape.
When I had a plug wire work loose, my tach did all sorts of crazy things due to electrical noise.
When I had a plug wire work loose, my tach did all sorts of crazy things due to electrical noise.
2011 SCCA H-Production National Champion
#3
Posted 14 November 2003 - 08:05 PM
I had the same problem. Replaced teh distrbitor and it fixed teh problem.
90 crx si
13.17@113 street tires low boost
86 samurai g16 turbo
13.17@113 street tires low boost
86 samurai g16 turbo
#4
Posted 15 November 2003 - 09:34 AM
#5
Posted 15 November 2003 - 02:40 PM
My civic did the same right before the alternator gave out. Replaced the alternator and it seems to be almost as accurate as the autometer.
#6
Posted 17 November 2003 - 09:11 AM
I have simmilar issuesd, except mine only does it when its cold out... and the ammount the tech jumps up seems relative to the throttle position... the needle jumps around a bit above actual RPM at idle, and them i hit the gas it jumps over 9k hahaha! I planned on replacing the cluster cause I have 2 spares, but who knows...
#7
Posted 17 November 2003 - 09:49 AM
That is usually a sign that the ignitor (ignition control module/ICM) is going bad. When it dies, you will have an undriveable car, as you get no spark. Either replace the distributor or just the ignitor module and the problem should go away.
"Toby, you are a thief of joy"
#8
Posted 18 November 2003 - 03:46 PM
Well, it has been sort of cold here of late... Every now and then it seems to be working just fine, but who knows? I will have to look into that ignition module/distributor issue. The parts all look to be in good condition, from a visual standpoint. Any way to check these parts with a somewhat limited mechanical background such as mine? I might have a voltmeter somewhere...
#9
Posted 15 May 2021 - 09:28 PM
I just replaced an ignitor module because of this thread and still no tach whatsoever.
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