Passat speedometer

1989 VOLKSWAGEN PASSAT
256,220 MILES • FWD • MANUAL
Avatar
ARLIND
  • MEMBER
  • 1 POST
I have recently bought a vw passat mk3 1.9TD, model 1989. The first engine of the car was 1.6TD later according to first owners words it was changed to 1.9l turbodiesel. The car is in a good condition except some little electrical reparable annoying problems. The speedometer shows 15km/h more than actually it is going eg. you are going 100 the speedo shows 115km/h. The tires aren't the original size they are 165/65/14, and I think they shoud be 185/65/14. But according to some tire calculators even if the correct size is fitted it would improve some 5km/h show less so even if I change tires I will get 10km/h more than actual speed.
What should I check and how can I fix this problem, please help! Any help appreciated!
Thanks in advance
Dec 23, 2010 at 8:45 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • CERTIFIED EXPERT
  • 110,175 POSTS
First, note that we only recommend direct fit replacement parts because it always seems that other things go wrong. If they changed the engine size, there is a chance that sensor are not working correctly, the computer isn't reading correctly... I have no idea what they have done to make the change work.

As far as the tires, that small of a difference in height will not make that much of a difference.
Jan 17, 2011 at 6:49 PM