Speedo Problem PFC

[GTS 33]

Was wondering if anyone has run into the same problem with the speedo on the Power FC. Noticed a couple of days ago that after about 1/2 hour of driving the speed starts jumping all over the place. I was doing about 105 then all of a sudden it jumped up to 140. Sometimes it stops working all together, just reads 0. The speedo in the dash cluster is fine, even though its wrong by about 4k's.

Could there be something wrong with my PFC or is there a sensor that could be rooted?

Thanks for any info on this problem

[Guest INASNT]

sounds like a speed sensor problem. I have an idle issue with my pfc at the moment, if i have the clutch out and in neutral the car revs to about 1700rpm till i come to a stop and then it goes back to normal idle.

[Jimbo2000]

on a side note, which is more accurate the pfc or the speedo needle? mine has differences at speeds over 100

[GTS 33]

Yeah thought it might be the sensor. Will have to get it looked at.

Ive been told that the pfc is more accurate than the speedo. Due to different size tyres.

[Guest INASNT]

digital reading will always be more accurate than an analog speedo