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740 valve noise/piston slap 700

posted by  CW on  Sun Jul 11 14:14 CST 2004
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last visit: Tue Feb 5 13:37 CST 2008
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Hi Dave,

Hmmmmm, I'm not a B234F expert, but I know a bit about them. It may be a sticking valve. What brand and weight of oil do you use in it? How often do you change the oil? It might be a good idea to pour in a good "engine flush", run the engine (following the instructions) and then change the oil. This might cure the problem if it's a sticking valve. If after you change the oil the noise is still there, try driving the car harder then usual (letting the engine rev higher, etc) for a few minutes, ocassionally this can help a lasy lifter get back on track. Piston slap is usually only apparent at idle or under ~1500 RPM. Sometimes it can be apparent at higher revs, but usually disapears once the engine is warm. Hopefully this will help you :)
--
Chris. Halifax N.S. '91 745Ti, 289K km and '91 745 NA, 374K km.






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New 740 valve noise/piston slap [700]
posted by  volvosfive subscriber  on Sun Jul 11 10:57 CST 2004 >


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