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Try a compression check. I suspect that you have been running with a loose head, so that the cylinders aren't contributing much, which is why there is little change when you disconnect a spark plug. You might also have burnt valves coincidentally on the same side of the engine. Tim Dapper Everett Barnes wrote: > > Hello. I have a tuning question as follows: > > While adjusting the air/fuel mixture on my 1600, dual-carb stock engine, I > noticed that the right-hand side of the engine (cylinders 1 and 2) have much > less of a drop in rpms when you get near the point at which you want begin > backing off the air/fuel valve. > > I also noticed that disconnecting the spark plug wires from cylinders 1 or 2 > do not seem to affect the idle of the engine, while disconnecting 3 or 4 > almost stalls the engine. > > Everything else is equal - carb idle adjustment, carbs are synched, valves are > set correctly, etc.. > > Are these indicative of a problem or is this normal? I seem to remember the > spark plug anomalies on my other vehicles and always wondered why that was the > case. > > Any feedback is much appreciated. I always like to have as much information as > possible. > > Thanks, > Everett Barnes > ebus@ebus.simplenet.com > 1955 Kombi / 1965 Squareback S > Transporter site: http://ebus.simplenet.com/Volkswagen