Turn on car, 3000rpm...what the?

[petesmith]

Hi Guys,

I recently got gas fitted on my VT wagon. At the 1000km tune up i told the guy it was almost stalling when reversing so he mucked around with the idle screw on the engine and also the micro processor thing under the steering wheel for the gas to make it idle higher...

Since then, at least once a day if not more, when i turn on the car it will rev up to 3000rpm, gas or petrol, and won't come down, sometimes it will if i put down the accelerator but more often than not it wont...

Also noticed on the gas micro processor thing, when i am in park and put down the accelerator to about 1800-1900rpm, the two lights on the micro processor still say that the car is idling...strange thought...

So i went to see the installer today and he was a big wanker, always is, so i thought stuff it, ill try and fix it myself (if i can!!).
Thats where you guys come in

If i was to adjust the idle screw back a bit, will that fix my problem? Has anyone had this problem before and if so how did you fix it?

Any help would be appreciated!

The gas system is a Polliauto converter, sprint gas tank, little led lights for the gauge and the micro processor thing under the steering wheel looks like i may be able to adjust it for the tps if necessary, not sure how though!

Thanks in advance!

[Cheap6]

I would suggest taking it back to the person who screwed it up, because as soon as someone else tries to fix it responsibility for it may be shifted, but doing what you have described suggests ignorance.

At the 1000km tune up i told the guy it was almost stalling when reversing so he mucked around with the idle screw on the engine.

Arrgh!. In a misguided attempt at fixing one problem, the guy's created another. Step one is to put the base idle adjustment on the screw back to where it should be. Here's how to do that:

resetting base idle

post #3 or post #6. Both methods will achieve the same thing.

That should fix the 3000 rpm flaring - check it on petrol to isolate the screw adjustment from the gas tune.

Then the gas tune can be looked at. There will be two aspects to that; the mechanical side and the electronic control side. I'm not familiar enough with Poliauto to say too much. Maybe one of the LPG fitters will contribute for you. A model number might help.

[petesmith]

Thanks for that..

Does anyone know which way (anti clockwise or clockwise) to turn the screw for more idle and less idle?