toastiepenguin

iTrader: (3)

I been having a reoccuring problem with my tach showing 1,500 RPM lower than it should. Now it is constantly doing this and I was just wondering if anybody had any advice on where to start troubleshooting with this.

I hear the "ignitor" is the verdict but I have yet to check it. I also have a extra coil pack for the trailing ignition so I might swap that out and see if anything changes.

Also, whenever I go over ruff terrian (torn up assfault at around 40 or 50 MPH) the tach jumps between a 1,500RPM increment, meaning where it should be and where it resides.

Thanks

-Jon

classicauto

iTrader: (3)

So whats it showing when you idle? 300rpm?

Either way, the trailing ignition holds your factory RPM signal output. Swap the trailing pack and see what you get.

toastiepenguin

iTrader: (3)

Earlier I swapped the trailing coil pack and that fixed the problem. Turns out for some reason there was a wierd blueish-greenish corrosion where the spark plug wires connect to the coil. Wierd.

Thanks for your help.

-Jon

5-Port-Hank

iTrader: (1)

Grab a tube of dielectric grease and pack the coil terminal with it to prevent said corrosion from happening to the new pack.