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Old 05-28-2009, 02:16 AM   #1
Zerogravity
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Default rod knock or valve knock

My car is making this noise when I shift or go over 3200 rpm..


is this valve noise or rod knock ?

should I get the same engine fixed or should I get a new block ? also how much would this cost both to fix or get new block ?

By the way this is not my CAR. but it sound very similar mines just doesn't do it unless you accelarete or shift over 3200rpm to 4000rpm FYI: if I accelarate like in the Video it does not do the noise..
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Last edited by Zerogravity; 05-28-2009 at 02:30 PM.
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Old 05-28-2009, 02:34 AM   #2
dvsone775
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I can only fathom how you feel at the moment....but that just doesn't sound right/normal. I'm trying to figure out a misfire problem. Good luck.
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Old 05-28-2009, 03:29 AM   #3
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I can't listen to the video right now, but I have a feeling I have the same sound you have. Only over 3000 RPM's, best heard in 1st or 2nd gear, under light-to-medium throttle input? Sounds like a rapid tapping?

If so, I too have been searching for the cause of that sound for hundreds of miles. I noticed it when I picked the car up with 127,000 miles on it, previous owner said he had heard it for plenty of miles as well. Figured it was a heatshield or something. Now coming up on 140,000 miles, no loss in power, and I haven't exactly babied the car the entire time either. My biggest guess is that is the timing belt tensioner. But hoping to find some other explinations (besides a bearing that is about to spin) before spending $100 on a new tensioner.
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Old 05-28-2009, 04:23 AM   #4
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I am very sorry to say but that sounds like rod knock either way you have to take apart the motor. As far as fix vs buy a new block it just depends on how much machine work cost in your area, i would try to fix it if it makes financial sense since you would be rebuilding the shortblock which gives you a chance to upgrade or just rebuild to stock either way you end up with a near new shortblock.

p.s. this is my first post in the forum but i have been working on cars for about 10 years now
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Old 05-28-2009, 01:06 PM   #5
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that sounded like a rod knock but you should empty out the oil and stick your finger inside the oil pan to check for metal shavings just to be certain
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Old 05-28-2009, 01:41 PM   #6
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Quote:
Originally Posted by DausWRX View Post
that sounded like a rod knock but you should empty out the oil and stick your finger inside the oil pan to check for metal shavings just to be certain
straining the oil through an old sock or some such and seeing any 'gold colored' flecs will indicate a bearing issue
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Old 05-28-2009, 02:28 PM   #7
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=-( dammm this sucks !!!
how much does it cost to repair ? I just need some estimate to avoid having some mechanic try to rip me off.
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Old 05-28-2009, 03:06 PM   #8
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Quote:
Originally Posted by DausWRX View Post
that sounded like a rod knock but you should empty out the oil and stick your finger inside the oil pan to check for metal shavings just to be certain
Quote:
Originally Posted by Uncle Scotty View Post
straining the oil through an old sock or some such and seeing any 'gold colored' flecs will indicate a bearing issue
Guys with noise like that honestly if he just drains it all into a bucket it will look metallic, i been there, its soo sad

OP about the price it kind of depends on how much machine work cost in your area and how much damage there is.
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Old 05-28-2009, 06:41 PM   #9
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I don't think you have the same problem as the car in the video you posted. You are only hearing the tapping noise during 3k rpm or with light throttle input right?
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Old 05-28-2009, 07:01 PM   #10
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now thats rod knock.
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Old 05-28-2009, 07:27 PM   #11
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I spun a bearing in my 2.0L and only heard a tap when I went over 2500 rpm's...I couldnt tell if it was rod, or valve knock, and seeing as I've never spun bearings in any car before I was at a loss...my tuner took a listen to it and it turned out being I spun the #4 bearing..I'm doing a full engine build and upgrade, and considering I'm in Alaska, and shipping is outrageous, I'm spending $1723 on parts, and I'd guestimate about $300-$400 in shipping..

I've found engines here in Alaska, but they're asking more than that to buy them from a junk yard etc..I'm also doing all the machine work on my own here at the Crafts Center on Post, so that helps alot with getting my car fixed cheaper.

Call a couple shops in your area, that do machine work, and ask what it'd cost to machine your block..IF you have rod knock, its most likely tearing up the cylinder walls, so you'd have to have them machine it, and assuming you want to just rebuild stock, have them sleeve it as well. I'm boring mine +.020, for more displacement, and the pistons for that are the same price as factory pistons..Just depends on what you are looking for man. Call the shops first about the machine work and get quotes from them before ordering parts though. They get expensive quick.
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Old 05-29-2009, 04:53 AM   #12
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Quote:
Originally Posted by sleepyfu View Post
I don't think you have the same problem as the car in the video you posted. You are only hearing the tapping noise during 3k rpm or with light throttle input right?

Yeah ...
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Old 05-29-2009, 04:55 AM   #13
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damm this just ruin my summer..
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Old 05-29-2009, 12:44 PM   #14
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Quote:
Originally Posted by sleepyfu View Post
I don't think you have the same problem as the car in the video you posted. You are only hearing the tapping noise during 3k rpm or with light throttle input right?
I think more people need to focus on this. Now you all are getting me worried too.

How many miles did any of you who spun a bearing go while hearing this noise before it happened? Mine has been going nearly 10,000 miles, maybe longer, but it is only audible under light throttle input and above 3k.
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Old 05-29-2009, 04:35 PM   #15
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my car has 73,000 and its just started.
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Old 05-29-2009, 04:38 PM   #16
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Rod knock. Bad bearings.
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Old 05-29-2009, 09:48 PM   #17
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Rod knock. I had the exact same problem. I bought ACL engine and connection rod bearings from Ebay for merely 80 bucks. Then found someone in town who had some STi rods so I wouldn't have to go get mine machined. Total cost me maybe 200 in parts, bought a gasket rebuild kit from 1stSubaruParts.com for only 250, and the rebuild took maybe ~22 hours in labor. It's a pain in the butt, and sorry to hear it happened, but it happens to the best of us. I also took advantage of it and upgraded my injectors and rods so while it's out, have some fun with it. But otherwise, this is not an expensive fix, but mind you it's extremely time consuming...
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Old 05-29-2009, 10:11 PM   #18
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Quote:
Originally Posted by Zerogravity View Post
my car has 73,000 and its just started.
what oil and changed at what interval??
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Old 05-29-2009, 10:44 PM   #19
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Is the noise coming from the center or the side of the block?
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Old 05-29-2009, 11:21 PM   #20
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that video makes me CRINGE.
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Old 05-30-2009, 02:00 AM   #21
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You have rod knock. Usually high pitch ticking noises would deal with head internals. Ultimately, you will need to replace your bearings. Try not to drive the car or it may lead to more damage.
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Old 05-30-2009, 02:07 PM   #22
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Quote:
Originally Posted by gling View Post
Is the noise coming from the center or the side of the block?
sounds like from the side this is why i was thinking it could be valves. but every one else says its rod..
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Old 05-30-2009, 02:09 PM   #23
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damm this sucks I just got some estimates and the cheaps one was for 4,600 new 2.5 short block... this includes everything labor etc.... another place said 8,000
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Old 05-30-2009, 02:14 PM   #24
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O man I did the same thing and my oil was gold totally full of bearing - I bought a JDM motor and had it dropped in. Good luck and search lots for options there are lots of them. It the worst noise ever and when it happened to me I knew exactly what it was and I had an hour to sit in my car and think about it until the tow truck got there .
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Old 05-30-2009, 02:54 PM   #25
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Quote:
Originally Posted by bikergreen View Post
O man I did the same thing and my oil was gold totally full of bearing - I bought a JDM motor and had it dropped in. Good luck and search lots for options there are lots of them. It the worst noise ever and when it happened to me I knew exactly what it was and I had an hour to sit in my car and think about it until the tow truck got there .

how much did it cost you to fix?
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