Adjusting the idle on a 1.8lt injected engine

Adjusting the idle on a 1.8lt injected engine

This applies to the 1.8lt JH injected engine. The idle adjustment screw is located at the top of the throttle body, facing towards the cabin of the car.

You can turn this by hand or a spanner, either way, to adjust the idle speed. Note, that if the engine has been running this area of the car may be hot.

A common problem to be aware of is the rubber O ring that sits on adjustment screw could be worn or have disintegrated which may cause a vacuum leak and affect the idle.

If you are having issue with idle fluctuating check electric ground points are clean, Idle Air Control valve is working correctly and air/fuel mixture is adjusted correctly on the Bosch K-Jetronic injection system.

Mk1 Golf engine idle speed screw location

 

Idle adjustment screw

Back to guides


Articles (car geek stuff)

The rare Australian sports car that appeared in a Hong Kong action movie

The rare Australian sports car that appeared in a Hong Kong action movie

How did this obscure Aussie sports car come to star in an Hong Kong action movie?

Using AI to imagine Australian made cars in 2022.

Using AI to imagine Australian made cars in 2022.

What would Australian made cars look like in 2022 if the Holden and Ford were still around?

10 years of Kawasaki W800 ownership - an honest review

10 years of Kawasaki W800 ownership - an honest review

An honest review of owning a classically-styled Kawasaki W800 motorcycle for the last 10 years