1996 VOLVO 850 R engine knock

uconnmike24 · Post by **uconnmike24** » 30 Mar 2011, 17:00

MY CAR IS A 1996 VOLVO 850 R I AM THE SECOND OWNER RECENTLY MY ENGINE HAS BEEN MAKING A RATTLING NOISE WHEN I REV THE ENGINE WHEN ITS ON IDOL THE CAR SOUNDS QUIET AND AS YOU SLOWLY START REVING THE ENGINE AND REV IT HIGHER AND HIGHER THE RATTLING GETS LOUDER AND SEEMS TO BE MAYBE A PISTON LOSE OR IF NOT IM NOT EXACTLY SURE WHAT THE PROBLEM IS IF ANYONE HAS ANY SUGGESTIONS AND IF I SHOULD TRY TO FIND A NEW ENGINE OR IF THERE IS A WAY TO FIX THIS THAT WOULD BE GREAT IT STILL DRIVES FINE BUT MAY NOT BE FIRING ON ALL CYLINDERS AT THE MOMENT THANKS A LOT FOR LOOKING AT MY QUESTION HOPE TO GET SOME IDEA OF WHAT IS WRONG SOON.

Post by **jblackburn** » 30 Mar 2011, 18:08

Please refrain from posting in ALL CAPS. It's very hard to read and makes it look like you're shouting.

Is there any way you can take a video? You can upload it to Youtube or email it to me and then we can post it here. That would help us track down the noise better.

From your description, it sounds like it could be either something in the belt area, a ticking valve (this can happen for a few reasons), or something in the lower end of the engine.

uconnmike24 · Post by **uconnmike24** » 31 Mar 2011, 14:23

Yea I will have a video up in a day or 2 if it's lower engine noise what are the options to fix it?

Post by **Red-Arrow** » 31 Mar 2011, 14:25

It probably is not knock from pre-detonation. It could be a broken piston ring or sticking valve. Hard to know without some testing and video.

uconnmike24 · Post by **uconnmike24** » 31 Mar 2011, 20:36

If I was to replace the head would this fix the problem ? I also heard it could be the o ring broken and air getting into the oil lowering the pressure but we will Know more when I post a video when this snow stops up north thanks for the input

DetailingTurboBrick · Post by **DetailingTurboBrick** » 31 Mar 2011, 21:16

Does it sound like this?

Post by **Red-Arrow** » 31 Mar 2011, 21:40

That sounds at first like a gas leak from the manifold, but there is a harder metallic sound which sounds like a rod. It could be the bearing or shell but it sounds like something bad.

Just in case have a look at the timing belt and see if something is slapping. Small hope.

DetailingTurboBrick · Post by **DetailingTurboBrick** » 31 Mar 2011, 22:09

its confirmed rod knock sadly know now 100 percent lol

Post by **Red-Arrow** » 02 Apr 2011, 13:45

A rod is not hard to replace on these cars but the crank maybe a little damaged as well. Somebody maybe able to give you better advice here than me.