Big_Bird

So my mom's xB2 is making an odd sound atm. xB2 has around 76k on it, it's an '09.

My mom just told me about this today, so I do not know how long it has been happening and I only heard it on a warm engine start up.

When the engine is running there is an odd knocking sound, but not exactly a knocking sound. It is not loud, somewhat soft, but noticeable. At first I thought it might have been around the belt area because that is where I thought the sound was coming from. I thought maybe a bearing is going, but I can't really diagnose that since I don't know what that sounds like. Upon closer inspection, it sounds like it might be an internal noise, coming from the left side of the engine. I have no idea what this is and hope it is not bad.

Any thoughts? The folks are supposed to be taking it in since we have a 100k warranty.

strtrcril87

Possibly the timing chain, or the guides?

Gutling

iTrader: (1)

I have heard quite a few water pumps making a knocking sound once they get bad enough. The reason they leak so bad on the 2.4 is the bearings go bad, and eventually start wallowing out so the pulley starts becoming eccentric.

Big_Bird

Hmm, that sounds like a possibility.

Big_Bird

Upon further inspection, the noise sounds more like a grinding sound. It happens every other second or so. Still from the left side of the engine. I cannot tell if it is internal or not but it is constant.

mnscionxb

see if the alt is super hot might be alt bearings

Bertmagik

my 07 tc is making the same noise (i think). i just hit 53k miles and its been doing it for a while, i just figured it was a heat shield somewhere, but now its getting really intense. i had the car up in the air and i started it up and put my hand on the oil pan and i can kind of feel when the noise "hits". i change my oil every 5k with royal purple 5w20 and just changed the tranny fluid at 50 with royal purple 75w90. im going to drop my oil pan and check all my rod endcaps for torque but i think im going to check the water pump/ pulleys as well

Jon

It might be the crank pulley. Mine intermittently rattles under load and sometimes at idle when the engine is at OT.

airdoza

Check the water pump!!!!!!!!! I had the same prob and today my car died on me. I pushed it into a parking spot and opened the hood to check it out. Saw one of the pulleys tilted to the side and as I reached down to touch it it completely fell off. It was the one attached to water pump and it completely sheared off the end of my pump. So the knocking noise I had been hearing was that it was cracked and vibrating and grinding till it finally came completely off.

FlintMica2005

iTrader: (1)

mine has had that grinding noise since my car clicked over 90k miles or less. im at 125k miles and its still there but its annoying/getting alil worse

Bertmagik

got mine fixed! it was the water pump. the bearing went to $h!T and wallowed out the hole. i was leaking coolant and the noise was getting reaaaly bad. but got it fixed under warranty still and she runs like a brand new machine! so anyone with crazy noises i would advise checking pulling ur belt off and try to wiggle the pulley on the water pump. good luck!

XD40tC

Most likely the water pump. Its like a sorta hollow grinding, clicking, almost coffee pot like noise right? lol Mine would only occur during cold starts but after a year of dealing with it and then eventually seeing the "pink line" under my hood, I took it in and the pump was the culprit. It hasnt made the noise since I imagine the problem will come back 20k miles down the road.

FlintMica2005

iTrader: (1)

hmm that could very well be it on mine too, but mine isnt leaking coolant or anything like that

Bertmagik

yeah mine had been making the noise since around 20-25k but it never got worse until recently (53k)... had the pink line and you could just grab the pulley and wiggle it around pretty good. def. something to check out here

JoeSpeed

I have 114k and I am getting a bit worry. Should I change the timing chain and water pump?

SamCarroll

My xB2 was a used car, apparently my water pump was shot when they got it. So that was replaced and my engine still knocked. From what i pulled up on my report off my vin here at work one of the techs had to shave the guides a small bit because it sat so long. I dont have any noises now.

I do know that Toyota's redesigned the gaskets and the water pumps because this was a huge campaign throughout the engine line.

I bought mine with 19k on the clock so if you havent had your car at least inspected at the dealer, i would highly advise it.

ntayloraz

I recently started having an issue when I start up my 2008. Almost sounds like a fan or a belt (no high pitched noise though). After a few minutes of driving it goes away.

My dealership did tell me that they were seeing stalagtites and such around the water pump seal. I feel like they tell me this every year around summer ( I live in AZ). But I am wondering if this is the problem I am hearing?
I just had the minor maintenance and the Basic transmission service performed.

If this sounds typical for the water pump going out....The dealership quoted me $572 to replace and remove replace the drive belt at the same time. Is this a reasonable quote?