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light knocking when hot
Posted by Tiziano (more from Tiziano) on Thu, 7 Jul 2005 05:30:52
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After headgasket job anything was ok: no more lifter noise, no more smoke at startup nor antifreeze consumption nor spark plugs unusual colour.
Head wasn't resurfaced 'cause of its smoothness and flatness (except few very small pits), but since then, 8000mi later a light knocking sometimes occurs , mainly after long trips with the engine hot.
Also, small coolant consumption and plugs 2 and 3 covered with (after just 2000 mi) what it looks to me white ashes. Car suffers at startup: I mean, it starts, rpm rise up and car suddenly dies. Hoses were replaced with new ones (air and fluid)and AIC has just some mi on it.
Car runs ok, with its 215 mi on the odo. Oil is a Castrol GTX 10W40, and sparx NGK BCPR7 ES11. I've read on the Bosch site that ashes are frequently caused by oil additives or gas adds: what's Your idea about It?I better try some other oil brand, or heavier oils?
Under pressure all night long,without sparx, no signs of liquid on the top of cylinders (lighlty covered with an oily-dry layer)
DI cassette has 80k mi but with a new one knocking continues...
Any suggestion or idea should be very deeply appreciated.
Thanx from Italy to You, SAABERS from TSB.
Tiziano
posted by 212.171.14...
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