6.2L Tapping noise
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6.2L Tapping noise In October I posted a question if anyone has had problems with lifters in a 6.2L. I finally took it in to the dealer after the noise getting worse. Sounds like a diesel going down the street after cold starts. I am being told that GM wants to have the oil pump replaced. So I am waiting for that to get done and go from there... no TSB on this.
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There seems to be an issue with the oil pump relief valve sticking. The process is to replace the pump, change the oil and filter, and recheck. Not only because this is the second time this has happened ( 2008 Denali XL rocker arm broke #2 and replace camshaft). I am in the business so I know more than the average customer.
Launching!
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From: CT
reason the lifters make noise on cold start is the bleed down is excessive in the AFM lifter thus making the rattle or tap for 2-60 seconds on start up. that applies for lifters but has nothing to do with engine oil being cold
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Launching!
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From: CT
I have replaced many of these in 5.3's 6.0's and 6.2's with this issue but if you are having oil pump relief valve sticking I am just wiondering did they do a mechanical oil pressure check on both the lower end and the valvetrain? and was there any metal contamination from lack of lubrication?
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Not an AFM engine. According to the doc. with changing the pump, they are supposed to flush lines if equipped, and clean inside of oil pan. I should be able to tell what they did by the parts charged on the invoice. However, yes I am aware that because a part is on there does not mean it was used.
