Spikey Tach Video

Johnny P · Oct 17, 2008

Tach needle spikes all over only while cranking. Once the car starts it works fine. Wires under dash appear fine, all other gauges also working fine. I also notice when I turn key on (not starting) the rpm needle will give a small jump and when shutting car off the needle also bounces around below 0 rpm then back up and resting at 0 rpm. I attached a video file showing how it cranks.
Anyone know what the problem may be???

Thanks

[URL=http://s371.photobucket.com/albums/oo159/johnfiveo/?action=view&current=Bouncingtach2.flv]View attachment 297078[/URL]

JohnnyRebel · Oct 17, 2008

That's not too bad. Mine will bounce all over the place when I'm driving down the road and somtimes go up to the redline on its own and stay there for a few minutes. Doesn't happen everytime I drive it but I think these cars have tach problems from the factory and are not all that accurate, most of the time you see people with aftermarket tachs mounted in their foxes - for good reason i think.

LiquidGT · Oct 17, 2008

Mine did that as soon as I put an Accel TFI module on; then it crapped out. So I'm using a Wells module and I noticed that the tach acts normal on start up now.

I think part of the tach circuit goes through the module; from my experience it could be that.

Johnny P · Oct 17, 2008

Yes, one does go to TFI. Think I will try replacing TFI and hope problem solved.
Thanks for the replies

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