Terry Burger

iTrader: (4)

My PCM reports 800rpm, while the tach reports 1100rpm. How can I fix that?


Thanks,
Terry

robertbartsch

weird?? Is this at idle?

slow

iTrader: (7)

same problem here. 800 1100 shown

i don't want to mess with the needle, but thats the only way i know to fix it.



Ryan

87GMC

same here on my 98, i thought i read somewhere thats how all the 98 were

Magnus

iTrader: (4)

Pull the gauge cluster out, then remove the clear cover, then put the gauge back in...

pop the tach needle off.. use a scan tool to hold the rpm's at 1000 rpm or 2K rpm.. put needle back on.

I did this to my car and it worked like a charm.

GuitsBoy

iTrader: (4)

If you turn the key to run, but dont start the motor, the tach spindle will zero out. No scan tool needed.

Terry Burger

iTrader: (4)

Great ideas guys! Thanks