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Model specific boards => Golf mk2 => Topic started by: True Blue GTI on 17 November 2003, 22:31

Title: 90 8v GTI Losing Performance"HELP"
Post by: True Blue GTI on 17 November 2003, 22:31

I've got a 90 8v GTI That will run OK for days and then all of a sudden goes really flat(Loses performance)
an injection specialist took a look but couldn't really help appart from getting it running better when it's Behaving. ???

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: golfvr6 on 17 November 2003, 22:37

Any other symptoms?

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: True Blue GTI on 17 November 2003, 22:47

When runnung in slow traffic the engine sometimes surges a little.(The tick over is a little random too).
The guy who tuned and checked it said he had to adjust the timing but i was told the timing is controlled by the ecu.

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: golfvr6 on 17 November 2003, 23:17

Look at the usual suspects ie. air flow meter and oyxgen sensor(if fitted). You are correct about the ignition timing, it is a controlled by the ecu , so is non-adjustable.

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: mk1 on 17 November 2003, 23:23

Check the pleated rubber hose from the air flow meter to the throttle body for splits. Base timing is adjustable on this system, 6 degrees i think ;)

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: golfvr6 on 17 November 2003, 23:30

I think mixture and idle was also adjustable on the early digifant.

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: Slim Shady on 17 November 2003, 23:38

try drilling the airbox
 :P

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: golfvr6 on 17 November 2003, 23:45

Yeah mate, talk sense when you know some  :-* ;)

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: Tornado-red_gti on 18 November 2003, 12:51

 Could it be the knock sensor? ???

Title: Re:90 8v GTI Losing Performance"HELP"
Post by: golfvr6 on 18 November 2003, 15:48

Could be, likely to either a vacuum leak or a faulty sensor.