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Here is some advice from air-cooled VW forum - Volkszone, where more tips and fixes are available.

Ignition

If you need to adjust the idle speed its the large screw on the side number 3 in the picture. 2 is the mixture and 1 is the fast idle adjustment. Adjust when the engine is up to full temperature.

A submission from VW forum – The Samba, visit its website for more tips and advice.

For both of those eras of vehicles I would say the top issue is usually rust. Typically on the floors or rockers but often elsewhere as well - wheel wells, undercarriage cross beams, and so on. Mechanical issues are usually fairly simple and most parts are available brand new from major VW parts places. In my own experience, most used buses need brake work.

LuK says it pays to ask about vehicle history when a high performance car comes in for a clutch replacement as it could have been highly tuned, had the EMS re-mapped or even had modifications made to the engine. In some of these cases a modified specialist clutch will be required. If a standard type clutch is fitted you may well find yourself dealing with clutch slip! Remember, many OE suppliers only sell clutches suitable for standard ‘factory’ spec vehicles.

Another tip is to also check the flywheel for signs of heat stress and cracking due to excessive heat build up, replacing if necessary.

Nissan Skyline (R33) 2.5i 24V - Engine code RB25DE

As engine overhaul procedures become necessary, it’s worth remembering that Corteco supplies Camshaft Seals (Corteco 19026764B Nissan 13042-16V00) and Valve Stem Seals (Corteco 19020004 – Nissan 13058-13151) for the Nissan Skyline. Both seals form a vital part of the repair process.

To help maintain the cleanliness of the Nissan Skyline R32, 33 & 34 models, it is recommend to clean the oil and fuel system at regular service intervals using Forté's Clean & Protect, carrying out a 45 minute Advanced Formula Motor Flush, adding Oil System Protector to the new oil and adding either Forté Advanced Formula Gas Treatment or Forté Advanced Formula Diesel Treatment into the fuel tank.

Common problems with a noisy differential can be treated at every oil change with Forté's Diff and Gear Treatment to reduce noise.

1998-2002 R34: Continual failure of ignition coils after only 1500-2000 miles, no fault codes recorded, poor/bad earth to engine ECU.

A few notes about the Nissan Skyline (R32/33/34)

Engine Oil

For this particular series of cars, Nissan lists several specifications of engine oil which should be covered by either Comma Xtech 5W30 or Comma Eurolite 10W40. Always use Comma’s application guide to make sure you get the right product for the vehicle you are servicing.

Read the generous contribution from the Skyline Owners Club, where there are plenty more tips, tricks, hints and solutions for these three generations of the Nissan.

Function:

The Oxygen Sensor (also known as Lambda Sensor) is located in the exhaust manifold and measures the amount of unburned oxygen in your engine's exhaust. Based on the amount of oxygen, it sends a signal to your engine computer which then adjusts the air/fuel mixture for optimum engine performance and emission control.

Return soon to see what the most common warranty returns on clutches are.