8v lack of power/running probs

[illumin]

Hi guys

I think my 1991 8v (PB engine) has something wrong with it as there is a distinct lack of power. I know these cars are not the fastest in the world but mine is TOO slow...............

It has a running problem since I bought it 3 weeks ago. It idles rough and pinks under acceleration - a timing issue I think. Would the timing be out affect the performance of the car? Today I wanted to see what the car would do as it has the running problems have supposedly been sorted out by a local VW specialist, including a new knock sensor. To start with acceleration was ok, but as I reached 80 in 5th there was no power left. My foot was planted to the floor and it would go no faster...surely that's not right?

I was thinking of taking the car to a local tuner to have a rolling road tune, but would that make any difference? Is it just a timing issue or something more serious? Any advice/help appreciated

[Organisys]

hmm, sounds like its under fueling...maybe the full throttle micro switch on the underside of the throttle body is not working?

What does everybody else reckon ?

[knobby]

try unpluggin it... I dont even have mine plugged in and it runs well.. (well before i changed my cylinder head anyways..but thats another story)

check the picture below.. thats the bit "Organisys" is talking about.. not sure it will help but its worth a go. Basicaly this bit tells the ECU when the throttle is in the idle position and at the full throttle position...

[Hatchet Harry]

check out a web page called kens digifant page... it covers all aspects of pb tuning and setup and should make ur car run like a dream..

http://members.tripod.com/~fuelie/intro.htm

[rubjonny]

On a digifant the switch on top of the throttle body tells the ECU when you have your foot down (wide open throttle) and adds more fuel, if its disconnected I would assume you would suffer from poor performance when you floor it, so get it checked out!
The idle switch is underneath the throttle body, and is only (barely) accessble if you take the inlet pipe off.  Even then you can't get to any of the screws, I had to tap the bracket with a hammer to make it click when the throttle was closed