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Random B18 engine anomalies 140-160 1968

posted by  Rhys on  Sun Jun 28 18:47 CST 2009
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

What's happening is that the PCV valve is either malfunctioning or the wrong one for these engines. Most modern ones are for big V-8's and they don't work on these engines.
So disconnecting the hose and plugging the fitting is a diagnostic trick - get it?
It proves the problem is the PCV. The extra air coming through the hose does not pick up fuel in the carbs and that has a drastic leaning effect that you are trying to compensate for with wild tuning adjustments on the carbs, trying to get the mixture rich enough. That won't work.
The PCV needs fixing, and fiddles with the carbs and hopeful wishes won't repair it. Vent the crankcase to the air filter if you wish - most of the blow-by will find it's way into the engine to be burned. If low emissions is your game, buy a new Honda because there is NO WAY a B18 Volvo will EVER be a low emission engine.
Fix or disregard the PCV system and the engine will accept a normal carb tune and you can drive the thing.






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