Question about 1998 Volvo S70

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Cold Start Knock

I have an early 98 S70 T5. When I start the car in the morning it rattles for about 1 minutes, then goes away. The engine sounds fine after that.
I brought it in to a local (non-volvo) mechanic who said that they couldn't find the source and recommended replacing the engine (sound like a rip-off anyone?)
The car sat for awhile while I was deployed overseas, but was recently serviced. Could it be an oil issue? What is a good product to clean out the engine from gunky oil if this is the problem? Thanks

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  • cmhobson45 Sep 18, 2008

    Thanks, but this wasn't normal a few months ago....
    I've been reading around and it sounds like it might be oil pan o-rings. Thoughts?


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That's actually pretty normal. It's just the engine warming up. Even my friend with a late model Acura has the same prolem so she warms it up before driving. I've heard experts say that warming up your car is just a waste of gas so I presume that the initial knocks are not to be worried about. Something to email Click and Clack on NPR about but I really don't think it's an issue. When I've had two cars run into the 200,000 mile range it didn't seem to be an issue. I always changed the oil before or at about 4k miles.
Take the car out for a long drive and enjoy it. And don't worry.

Posted on Sep 17, 2008

  • rich medrano
    rich medrano Sep 18, 2008

    This certainly is a question for a couple of guru mechanics. I'd submit it to them just to see what they say.



    http://www.cartalk.com/ct/3500.jsp



    Oil pan rings? It could be an oil pressure problem. If the engine runs okay when warmed up after a while I'm sure there is a reasonable solution rather than replacing the engine. I've used a small amount of transmission fluid in the oil of older engines I've had to keep them slick and running well. Kind of like STP treatment or such. A school bus mechanic recommended it to me and when I told a few other "piston heads" I knew about it they all heard it was an okay idea. Maybe a half cup or so. You probably have some gunk on the valves or cam shaft or something. I'm encouraged still that it runs okay when warmed up.

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