Opinion on knocking sound b4 taking it to toyota

[01GTSspecter]

hey guys. before I go into what my car is doing. Give you all some back ground. I mis-shifted going into 4th and went back into second on an 01 GTS. It destroyed my stock clutch. So I put in a fidanza flywheel and ACT clutch. I picked the car up and everthing sounded normal. I drove the car around for a good hour, hit lift a few times still sound normal.

The car would stall right after I picked it up when ever I would stop, but it worked itself out of that. I think the ECU needed to adjust for the lighter flywheel. When I got home I noticed I recieved my AEM CAI. Myself and a friend installed that the same day. We took the car out for a drive. and now it developed a knocking sound. Never heard it before so I guess thats what it is.

It sounds like a piece of metal tapping the valve cover. thats the best way I can describe it. and the tapping directly correlates to my rpms. I can hit lift without any problems, just the tapping will be really fast, or really slow depeding on which rpm im at.

What do some of you guys think is going on? Im sure some of you have way more expierience than I do with the GTS. I can speculate on what the different problems are, Im just looking for opinions before I take it in.

Thanks in advance!

[wang2000]

when i first got my gts.... drove it home...heard some knocking sound too and basically it was somewhat like your condition....
"and the tapping directly correlates to my rpms"
brought it to my mechanic and they found that the driving belt was beat up with tears and scratches.... got that replace and no more knocking... hopefully it will be that since its not that much to fiix....you can basically do it yourself too.

[Littleguy]

My guess is......bent valves ftl.

[01GTSspecter]

i did some research on the net and found my exact sound. ill copy and past it.

[Dasher17]

I actually got the same thing and fixed it by replacing the bearing on the AC compressor, it was about to go and if that was gone the belt that also runs along the alternator would have stopped.

[2way]

Probably bent a valve on your misshift.

[slidr]

Yeah, you are most likely looking at an engine problem that's only going to get worse.

[01GTSspecter]

i have an appointment on the 2nd. Toyota is going to look at it. The tech there said it just sounds like it needs a valve adjustment, or might have a broke spring. If it were a bent valve dont you think I would have heard or noticed it when i first picked it up from the tranny shop? Cause it ran normal all day. until I put the intake on then it developed this clock tick. I am being optomistic on the valves needing adjustment.

[2way]

Or rod knock....

[01GTSspecter]

what is a rod knock? the sound literally sounds like those wind up toys that self propell themselves. so my car sounds like a wind up toy haha

[2way]

http://www.newcelica.org/forums/showthread.php?t=247889
Maybe your hitting the oil fill tab?
http://www.newcelica.org/forums/showthread.php?t=234131

[01GTSspecter]

my ticking isnt as deep as the videos in those links. it sounds like a light piece of metal tapping the valve cover. If your looking at the engine it sounds like its coming above the middle right cylinder but above it. when i rev it really does sound like your winding a toy up. im hoping its not a rod knock. from what ive read im not ruling it out. ill found out in a couple days though.

[2shea]

Take a look at your drive belt....

[01GTSspecter]

Here is the verdict on my car.

The ticking noise is being caused by a missing shim on a valve that makes up the space between the valve and CAM.

They also told me that I have at least two bent valves and I only have 90lbs compression in two cylinders.

Now to fix it, its gonna cost 1700 at least at toyota for labor alone. I was thinking of just getting the Stage 3 Head from Monkeywrench. And paying for the swap out on that. To me it would be more worth it, plus i would have a much stronger head, and it would be ready for better upgrades.

[autxr]

Where did the shims end up? If you can't find them laying in the cylinder head, or in the oil pan, it's safe to assume they are chewing up other parts of the engine.

Pull the head and take it to a machine shop. My guess is you come home at under $400 in parts and machine labor. How much does toyota charge to replace a head gasket (that's all you are really doing if you supply all the parts).

[01GTSspecter]

toyota said 1700 to fix my engine since they will have to take it all apart to fix the messed up pieces. They couldnt see the shim at all in the head, and they assume it fell in the oil pan since its a really small shim. I speculate it got blown out the exhaust, but im not gonna pay for them to drop the oil pan to check for somthing that may not be there.

As far as machine shops, I doubt we have a good selection being in rapid city south dakota. only 60k people here. But it doesnt hurt to call around

[Littleguy]

toyota said 1700 to fix my engine since they will have to take it all apart to fix the messed up pieces. They couldnt see the shim at all in the head, and they assume it fell in the oil pan since its a really small shim. I speculate it got blown out the exhaust, but im not gonna pay for them to drop the oil pan to check for somthing that may not be there.

As far as machine shops, I doubt we have a good selection being in rapid city south dakota. only 60k people here. But it doesnt hurt to call around


It doesn't take much to take out the oil pan, and this is one of those situations where if you don't inspect everything, and just try to fix it as cheap as possible you'll probably end up with more problems in the end. You have probably been driving around with the bent valves since your mis-shift.

[01GTSspecter]

The shim isnt that expensive and doesnt require any more parts being taken off and the only thing out is the cams. Car was non-driveable after my mis-shift cause the stock clutch spun out of track and I was unable to get back into gear. Mis-shifts are costly, i will have to replace my tranny eventually too cause my third gear synchro is dieing now, prob cause of the mis-shift. New tranny is 2300 I think too. So really its cheaper to wait for the little shim to come in so they can put the cams back in so i can just have the car sittin in my garage till I get money to fix the head.

I can still drive it around but compression is borderline to the point where my car wont even start soon. Good thing I have another vehicle to fall back on.

[Max654]

hey guys. before I go into what my car is doing. Give you all some back ground. I mis-shifted going into 4th and went back into second on an 01 GTS. It destroyed my stock clutch. So I put in a fidanza flywheel and ACT clutch. I picked the car up and everthing sounded normal. I drove the car around for a good hour, hit lift a few times still sound normal.

The car would stall right after I picked it up when ever I would stop, but it worked itself out of that. I think the ECU needed to adjust for the lighter flywheel. When I got home I noticed I recieved my AEM CAI. Myself and a friend installed that the same day. We took the car out for a drive. and now it developed a knocking sound. Never heard it before so I guess thats what it is.

It sounds like a piece of metal tapping the valve cover. thats the best way I can describe it. and the tapping directly correlates to my rpms. I can hit lift without any problems, just the tapping will be really fast, or really slow depeding on which rpm im at.

What do some of you guys think is going on? Im sure some of you have way more expierience than I do with the GTS. I can speculate on what the different problems are, Im just looking for opinions before I take it in.

Thanks in advance!


Sounds exactly like what happened to me back in the fall. I misshifted it, was fine for a few months, lifted good. Then the knocking came. Less than an hour after it started, my engine was dead. My bearing was spun and the knocking sound was my valve hitting the head. Id recommend taking the car in immediately by tow. If you havent lost any power yet, your engine may still be salvageable. But, you're probably looking at a dead motor soon.

[autxr]

toyota said 1700 to fix my engine since they will have to take it all apart to fix the messed up pieces. They couldnt see the shim at all in the head, and they assume it fell in the oil pan since its a really small shim. I speculate it got blown out the exhaust, but im not gonna pay for them to drop the oil pan to check for somthing that may not be there.

As far as machine shops, I doubt we have a good selection being in rapid city south dakota. only 60k people here. But it doesnt hurt to call around

Toyota won't be doing the machine work in house, so there is a machine shop somewhere. you can always send the head out, 2 way shipping is likely only about $100.

If the shim got blown out the exhaust, you have bigger problems (the shims are not in an area open to the combustion process). The part (or what's left of it) are somewhere in the engine.

[slidr]

I doubt the shim got blown out the exhaust.

[01GTSspecter]

toyota suspects the shim is in the oil pan, and is too heavy to be sucked up. everything is fine for now. still have those bent valves. Ordering a stage 3 head this week from MWR. and I was quoted at a local shop 1k for parts and labor to swap the heads. they'll be changine out required gaskets and seals. We have a dyno out here, I will get it dynoed after the new head is on and post the results for you all. im hoping I will have it dynoed before I leave for mississippi later this month.