Engine knocking

RdFaerie · Post by **RdFaerie** » 22 Mar 2012, 19:17

I always thought this was a Volvo quirk but when I start my car in the mornings and at the end of the day (after long intervals of not running) the engine knocks. Not long; only for a brief second.
I have my oil changed regularly, so I know it's never low on oil. It does burn oil fast; I use 20/50 synthetic Valvoline. Any suggestions?

Allisha

Post by **JDS60R** » 22 Mar 2012, 19:29

Engine knocking is an early indication of engine failure as the parts are now loose enough to knock against each other. Some other conditions cause engine knock like excessive carbon on the pistons and this can be cleaned chemically.

I believe 20/50 is the wrong oil for this motor as most Volvo's prefer a 30 weight or 40 weight for the older ones. Please check your owners manual and use the right oil. Using a synthetic is smart but if it is burning oil and knocking I would want to know the cause.

Emjay31 · Post by **Emjay31** » 19 Apr 2012, 14:39

Have u checked the Engine mounts?

Cheers

Post by **MoVolvos** » 19 Apr 2012, 15:12

RdFaerie wrote:Not long; only for a brief second... Any suggestions?

Allisha

Add this to your current oil and drive for 500 miles
http://www.pelicanparts.com/catalog/sho ... pg6.htm#73

Add this to the fuel system one or two tanks full
http://www.pelicanparts.com/catalog/sho ... pg9.htm#73

Switch over to this 10-30W or 15-40W depending on your weather and your knocking should go away unless your knocking is much louder than what is perceived from your description which means main bearing or lifter issues
http://www.pelicanparts.com/catalog/sho ... co_pg8.htm

You may try a local Indie Porsche or Ferrari shop or dealer for better pricing.

Independent Volvo uses these products
http://www.yelp.com/biz/independent-vol ... lnut-creek

Blessings,
BKM
-

Post by **jblackburn** » 19 Apr 2012, 16:40

It's knocking because you're using 20W50. That's WAY too thick on a cold start for a car this new. That knocking is the lifters crying because they're starved for oil on a cold start with thick oil.

Go down to a 10W. -30 or -40 is your choice - 30 is fine for most applications. Mine likes 5W even more in cooler weather. 20W-50 is for old cars built in the 60's and 70's.

Volvo's don't really burn oil; they leak it. Everywhere. Get up underneath the engine and look for any obvious leaks - they don't always touch the ground.

If it is burning oil...visibly...you most likely have a clogged up PCV system.

Post by **jimmy57** » 19 Apr 2012, 17:10

what is the car? The 2005 S40? Which engine?