Jump to content
Sign in to follow this  
wes

Cam Rattle

Recommended Posts

I have a 2000 corolla, at higher rpms there seems to be a rattle that sounds like its coming from up around the cams. I also can burn up to 2 quarts in a week and a half, anyone got any ideas on what this might be if not cams, and if it is cams what to do to fix it?

Share this post


Link to post
Share on other sites
trap

Need a bit more information.

 

How much oil is the car consuming over mileage - i.e., car burns X number of quarts every X miles? Two quarts in roughly 10 days does sound fairly excessive - but how excessive depends on the miles driven and if you have any other issue, like oil leaks and whatnot. If you drove 2000 miles over that week and a half, that would put you at 1 quart every 1000 miles or so - not really good, but not terrible either, especially with a car with a lot of miles on the clock.

 

Also depends on the mileage you have on the engine, what transmission it has, and how it is driven. Also be nice to know the type of motor oil used, oil viscosity, interval between oil changes, etc. Oil changes done by yourself or quick lube places/dealership? This will be more important if you really do have a cam rattling issue.

 

The 1ZZ-FE engine is known to be very noisy at idle and at speed. See if you can pinpoint the noise more precisely - you mentioned higher RPMs, what kind of RPMs are we talking about - 3000RPMS, 4000RPMS, redline? Since this is a 2000 model year, they also introduced VVT-i to this engine - that has an associated oil control valve and oil control valve filter. If the car is running through a lot of oil, there is a good chance that the filter or control valve itself is clogged up. This will prevent the variable valve timing system from functioning properly - would cause some vibrations and rattles, due to the timing not being optimum for that particular load/RPM range.

 

1ZZ-FE is not really known for cam issue - but things that could be causing the rattling noise at speed - VVTi system being clogged, running too heavy of motor oil (starve the bearings in some cases), running with too little motor oil (again, starves bearings), bad oil pump, bad accessories, worn serpentine belt tensioner, or tired engine.

 

Some 8th gen Corollas had very high oil consumption - some on the order of a quart over hundreds of miles. Some are as bad as a quart every 100 miles or worse. Most are due to stuck piston rings, many are associated with 3-speed autos option on earlier 8th gen Corollas without VVTi (1998-1999 model years). Later models had some redesignes that seemed to help,m but some still had some excessive oil consumption. Sort of hit or miss - some have had no problems at all running hundreds of miles on their cars, some had problems from basically day one.

Share this post


Link to post
Share on other sites

i have just under 113k on the engine, it has an auto trans with overdrive, not really sure how many gears it has, oil changes have always been done by a lube shop untill i got the car from my grandmother last year, as far as i know its always used a 5w30 oil as is called for, but once i noticed the noise i upped it a little to 10w30 to see if it was a lower end issue on the crank, now i didnt know there was an oil valve for the vvt-i, wheres that located at? i think i might need to check that out

Share this post


Link to post
Share on other sites

oh and by the way, it happens when putting a slight load onto the throttle or taking the load off gradually, forgot to put that there

Share this post


Link to post
Share on other sites

The oil control valve and the oil control valve filter are almost immediately to the right of the alternator, just to the left of the far intake manifold runner. I started a thread on the OCV filter some time ago - here's the link to it: https://www.corolland.com/forums/index.php?/topic/22499-diy-info-some-uncommon-maintenance-items/page__view__findpost__p__159456

 

113K is not a lot of miles on this car, definitely find out what the oil consumption is like, as that will play a big part of what is happening. I mentioned quick lube places earlier, as there is a history of bent valvecover baffles on this engine family. The baffle is located directly under the oil cap, since most shops use a oil gun where the nozzle attaches to the valvecover with a clip or is just simply wedged in there - this can actually bend the baffle downward enough to touch the camshaft. Many dealerships also can cause this damage - depends on the dealership. Unfortunately, the only way to find out is to pull the valve cover off.

 

The behavior of the rattling most noticeable at a light loading/unloading of the engine sounds more likely to be a OCV / VVTi issue. Really no power loss or driveability problesm, more of an annoying rattle. Doesn't just affect Corollas - many Celicas and MR2s also have this noise issue, Lotuses with the Toyota 2ZZ-GE have be reputed to have this noise too. Newer Corollas/Matrix and other Toyota engines with VVTi can make this noise, but generally less noticeable.

 

Heavier oil will generally help overall noise - but I would not recommend that as a solution. Definitely would not recommend anything heaver than a 10W30 - if the car has been running conventional oil, stick with that for now. If it is an issue with the OCV filter being clogged (fairly common in cases with this rattling at a light loading/unloading of engine at engine revs off-idle to 4K RPMs) - an oil with greater solvency might make the issue worse (loosen up bigger chunks of engien gunk and totally clog the OCV filter, gum up the VVTi actuator).

Share this post


Link to post
Share on other sites

hey it took a little while to get to pulling the filter and such, but yeah it was pretty clogged up. i cleaned the filter and the valve up and the noise has gone away quite a bit, still have a little rattle to it but its not nearly as bad, im thinking i might pull the valve cover and check to make sure nothings chipped or loose, i still have some blowby though when i get real heavy on the throttle but thats a 4 cylinder for ya, thanks for the help bud.

Share this post


Link to post
Share on other sites

My 2000 Corolla is experiencing the same symptoms, except I can't verify how much oil it burns off. I change every 4000, and last time I almost overfilled it. When I changed it, it was just below the low line.

 

The noise is a rough, rattling noise. It's easiest to make the car make the noise by accelerating quickly (pedal down), then letting up quickly right before the transmission usually changes (let pedal up maybe half-way, not all the way). The rattling is the same frequency independant of what gear the transmission happens to be in, though the frequency increases as the RPMS increase

 

I've noticed several people have had success in cleaning out the OCV filter. What kind of solvent would I be safe in using, and if it falls out of the bolt but stays where it is, would I be able to just screw the bolt back in until I have the tools to fish it out?

 

I've been considering seafoam but this seems to be a semi-common problem with the 1zz-fe vvt-i.

 

Sorry for the thread necromancy, at least it's only been dead for a few months ;-)

Share this post


Link to post
Share on other sites

The difference between the full mark and the low mark is about a quart. So over that 4K mile interval - you lost atleast a quart of oil. Little more than I'd like to see, but well within reason for a 10 year old car with enough miles on it. I would try to keep up with the oil levels as often as you can. Even dropping 1/2 to a quart, puts a heavy load on the remaining oil left in the crankcase. I would check the level every time you fill up gas or atleast set intervals to monitor oil consumption.

 

As for the possibility of a clogged or gummed up OCV - quite probable, given your description. Part throttle or light engine loading at speed causing the noise is the key. Careful when doing this project - if the filter drops off the bolt, you must fish it out. The way the filter and bolt sit inside the opening - if you do not perfectly line them up, you could distort or crush the filter. Sometimes you'll find that the filter is already distorted from excessive heat or from too much sludge/deposits stuck on it. You can clean the filter with just about any solvent - just make sure the solvent is not too strong to dissolve the plastic body of the filter.

 

Seafoam can be used as an engine flush - but I wouldn't go that route just yet. As a solvent, it works pretty well - because of this, if the engine has a decent amount of deposits inside of it - they could loosen all at once, that could lead to clogged oil passage ways and clog filters. Seafoam used in it most popular application, pulled through the intake to clean the upper end, will not help the OCV filter.

Share this post


Link to post
Share on other sites

I'm excited! This weekend I'm checking my OCV filter. I've been worried that I had something loose somewhere, but here's hoping it's just this filter thingamabob!

 

Thanks fish! I'll hold off on seafoam for a while. I don't like hearing how it either will do miracles or completely clog up your smaller lines.

Share this post


Link to post
Share on other sites

its been awhile on this thread but, it wasnt cams afterall, here my number three rod bearing has basically disappeared completly, the rest of the bearings are chewed up, i have 2 stretched rods and the crank is shot.. so, if you guys have this noise, pull the pan and check them out.

 

 

Share this post


Link to post
Share on other sites
Guest Oninous

I just found this topic today. I'm having this problem and had a mechanic friend pull off my valve cover to inspect my CAMs. I have a 2001 toyota corolla 1.8L 1ZZ-FE. I have dual overhead CAMs. The front CAM, I assume the intake, has chipped lobes on the far left end. (close to the timing chain) Only the 2 left lobes are chipped on the left sides of the lobe. I have no idea what to do besides replace the lifters and the intake CAM. I didn't hear about the OCV thing until now but I'll research it more now that I have. Any idea what would cause the CAM lobes to get chipped? They seemed oiled up and there wasn't any debris inside there at all.

Share this post


Link to post
Share on other sites

I just found this topic today. I'm having this problem and had a mechanic friend pull off my valve cover to inspect my CAMs. I have a 2001 toyota corolla 1.8L 1ZZ-FE. I have dual overhead CAMs. The front CAM, I assume the intake, has chipped lobes on the far left end. (close to the timing chain) Only the 2 left lobes are chipped on the left sides of the lobe. I have no idea what to do besides replace the lifters and the intake CAM. I didn't hear about the OCV thing until now but I'll research it more now that I have. Any idea what would cause the CAM lobes to get chipped? They seemed oiled up and there wasn't any debris inside there at all.

 

Quite unusal to see chips in that manner. Can be caused by a number of things - if no debris is noted (have you cut open the oil filter yet?, dropped the oil pan and checked the screen on the oil pickup?) - then it is likely worn lifter "cups", which can cock slightly sideways in the bore and then load the edge of the lobe, causing it to chip. Or it could be the cam itself is "walking" (worn bearings, camshaft play), sideloading the lobes and causing them to chip. Check the teeth on the sprockets - do any of them appear chipped/worn? Notice any slack or lack of slack on the timing chain?

 

I'd suggest pulling some oil and sending it to a used oil analysis shop to look at wear levels. Could give you something to go on, depending on which metals are in the highest concentration. Can try the old school trick of running a magnetic drain plug to catch any ferrous metal that gets past the oil filter.

Share this post


Link to post
Share on other sites
Guest steve

 hi stumbled across this searching for toyota corolla noise.. what does the OCV filter do? i know it filters oil but is it oil going into head or flowing out of head?  

i have a 2000 corolla with some noise thinking might be rod bearings i did clean the filter and it was real dirty.noise went away for few miles but back again. just bought this car and was real low on oil. noise is around 2000rpms or higher get a clatter or knock. if i slow it down or speed up noise goes away. if i keep pushing and depressing accelerator wont make the noise.just when its a constant rpm over 2000.

thanks.

Share this post


Link to post
Share on other sites

PCV filter you mean? It actually filters air rather than oil. Did you check oil grade? Noise sounds more like something's loose, to me, (a non-expert)

Share this post


Link to post
Share on other sites

Join the conversation

You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

trap


×
×
  • Create New...