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Old 05-28-2012, 01:49 PM   #1
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Exclamation Svt engine knock?? Help!

Just did my timing belt for the second time because my belt was walking off my cams and rubbing against the cam cover and metal piece that covers everything up and holds the motor mount in place (really scary) It has been 3 weeks since doing my timing and everything went fine I think my idler pully was bad and thats why the belt was walking off the gears now all of a sudden my car makes this knocking/ticking sound it comes and goes sometimes its there sometimes its not and it is definatley something with the cams or VCT gear....it dosent get louder as the RPM goes up but it sounds like when your going up on a roller coaster and you hear that ticking sound as you go up my car sounds just like that sometimes when im driving only code my car has is p428....i thought it was p420 but my scan tool came back p428 could a bad o2 becausing this?? I dont think so...could there be something wrong with the timing?

ive been reading threads about a bad VCT phazer....and alot of people talking about a bad VCT solinoid but I just have my doubts this is a strange one...I know my post is confusing but please HELP!!!!!

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Old 05-28-2012, 05:20 PM   #2
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Take a video or sound clip...kind of hard to diagnose wen u can't here it in person
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Old 05-28-2012, 05:24 PM   #3
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if it's anything like this...

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


....it's bad, don't drive it, don't even start it again.
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Old 05-28-2012, 05:30 PM   #4
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not nearly that bad...mine is close to that sound though but it comes and goes but its not as loud...what was that?
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Old 05-28-2012, 05:47 PM   #5
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sounds like a time bomb... good lord
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Old 05-28-2012, 05:52 PM   #6
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Make sure you check everything. I read posts on this site and they were a great help with the timing belt install. I had a noise similar to that after I did mine and it ended up being the serpentine belt tensioner hitting its stop point. Just a thought man.
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Old 05-29-2012, 12:57 AM   #7
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Quote:
Originally Posted by Chris_HT View Post
if it's anything like this...

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


....it's bad, don't drive it, don't even start it again.
im gonna be tearing into it tomorrow...Ive been doing alot of reading and im still not too sure what could be wrong other than its out of timing but not throwing a code? im scared to drive it even though at times it seems to go away I will keep you guys posted I hope I havent hurt anything and everythings Ok
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Old 05-29-2012, 01:33 AM   #8
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well the noise in the video is the sound of pistons being smashed...

maybe you can make your own video, I'm just a newbie myself bt it would made it easier for others to diagnose your problem.


and a nice method of locating noises.... 1ft of garden water hose (or something similar), one end you stick to your ear, and with other end you can 'scan' around engine compartment to pinpoint noise source ... ok, at least with exhaust it worked to locate crack :P
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Old 05-29-2012, 03:14 AM   #9
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If the car has been running fine for 3 weeks after timing belt change then theres obviously nothing wrong with the process you used and your timing must of been fine...so....I would take all the covers off again.....re-check timing and also re-check all bolt torques.

One things for sure though......dont run the engine again until you've checked all the torques, ie crankshaft bolt, camshaft bolts, idler and tensioner bolts. You may be lucky and find that a loose bolt has allowed the timing belt to jump a tooth or two and hopefully it will be a quick fix with no longer term damage but unfortunately it does sound like you have a bent valve. Have you noticed a loss of power whilst driving?

May also be beneficial to remove each spark plug and check if any are being hit.
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Old 05-29-2012, 05:38 AM   #10
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Quote:
Originally Posted by dirtbrown View Post
....it dosent get louder as the RPM goes up
Search for loose brackets, and yes, use the Mechanic's stethoscope to best your fears. You can use the rubber hose method, or simply a long screwdriver or stick will do. Cup your ear to the other end of it, and you'll hear noises from that section of the vehicle. For example, I thought I had valve noise a few months ago. I put my screwdriver on the valve cover and listened to the other end of it- all I heard was the valves/cams doing their job as they should. The block was quiet as well. I expected to find some sound from the injector rail, but when I put it on the intake manifold I heard the sound I'd been hearing outside the engine. It turns out that this part called "tumble flaps" were what was causing my problem. Now I know I don't have to worry about the valve train for the moment.
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