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General => The garage => Topic started by: jettagreny on 21 March 2014, 22:46

Title: mk2 jetta gt trip computer problems
Post by: jettagreny on 21 March 2014, 22:46

hi i have a jetta gt with a trip computer i recently had the engine out of it to clean it up and also fitted a stainless manifold and full system.  before i had the engine out the trip was reading an average mpg of around 30mpg but after i refitted the engine it doesn't get above 12mpg! i hope this is wrong! dose anyone have any ideas as to why it is doing this?

Title: Re: mk2 jetta gt trip computer problems
Post by: gazareth on 22 March 2014, 00:24

sounds like the small vacuum line from the brake servo pipe to the back of dash clocks is not connected. if the clocks are not getting a vac reading of the engine they think the car is running flat out all the time.

Title: Re: mk2 jetta gt trip computer problems
Post by: Screech16v on 25 March 2014, 20:33

Gaz how does the mk3 get it mpg reading?

Title: Re: mk2 jetta gt trip computer problems
Post by: itavaltalainen on 25 March 2014, 23:16

from ecu

Title: Re: mk2 jetta gt trip computer problems
Post by: gazareth on 26 March 2014, 00:48

glad someone stepped in there coz I have no idea :grin:. but I would think the ecu takes readings from engine speed/throttle position and air intake.