car was running fine and then....

[clipise]

can someone please help me out w/ this?!?!?!?!?

i go to my friends house to chill for abit. i show him my car and we hear a noise. he thinks the timing might be off just a tad. so i shut off my car and we talk for a bit. and then i asked if he wanted to go for a spin. so we hop in my car and we take off. i get on it once and i hear loud ticking and i let off. we go back to his house and we rev it at a steady 2k rpm. and what do we hear? we hear what sounds to be my valves kissing the pistons. or some kind of loud rattleing noise coming from the enigne somewhere. but then we do more looking around and realize its coming from back of the engine. it sounds like its coming from my intake manifold. i got the cyclone intake manifold.

heres how it runs.....

timing belt is new and the timing is correct.

my car just came back from AMS from awhole lot of maintance. they didnt mess w/ the timing at all.

my car idles perfect.

balance shafts are removed


so my question to u guys.....

is it possible for the cyclone intake manifold to fail? like the butterflys get f*cked up?


any ideas? any questions just ask.



thanks,

 

[BoostinAWD]

Does it click all the time or just when you rev it?
Might be a spun rod bearing. Don't let me scare ya though I'm not there to listen to it.

 

[clipise]

only when i rev it. but it also sounds like something is rattleing when im done reving it in the intake, im pretty sure. the oil looks great. idles really good, like before.

 

[baby huie]

haha check yout timing belt i bet it is what is ratteling. do u have the cover on it or is it off. i got mine done and mine was ratteling and i thought my tensioner was bad and after i ran it for a few days it got better. take a flash light and put it on the outside of the timeing belt and see if u can see it moving up and down by the cams i bet thats your prob.

 

[clipise]

ill check that. but the belt was tight when i check it last night. i just hope its something stupid. . but today im going to rip off the intake manifold and then ill see whats going on.

 

[steve]

I haven't looked at the cyclone but on the NA 3000GT it's common for the VICS butterfly shaft to vibrate from intake pulsing and clatter like crazy. Look at the manifold and see if you can find the ends of the cyclone butterfly shaft. Hold them and see if the noise goes away.

Steve

 

[clipise]

thanks man, im going to check it later. i didnt rip off the intake manifold yet. but thanks for helping me out. oh yea, is there a way i can fix it w/ out ripping it? even through if this is the problem im going to rip it off later.

 

[blackGSX2g]

If it was the valves kissing the pistons, that would only happen once...after they were bent, they wouldn't be touching the piston heads anymore.

 

[steve]

oh yea, is there a way i can fix it w/ out ripping it?

I wouldn't know. If this is the problem then I would expect you'd know once you look at it if it's something you can fix or just ignore.

Steve

 

[clipise]

yea, thats not the intake manifold. the noise got much louder, but the performance didnt go down. idles perfect and everything.



ppl say its....


main bearing

rod knock

rockers or lifters


if it was the top 2, then wouldnt the performance and idle would be messed up?
the noise is a fast tick or knock. any ideas? this is first time i ran into a problem. and if i rip the vavle cover off wouldnt i see if it is something w/ the head?

thanks

 

[diab0liK]

This could be a bit of a shot in the dark, but could it be valve flappage? When was the last time you had a tune-up?

Valve springs might be suspect, hope it works out for you

diab0liK

 

[clipise]

ijust paut my car back together acouple months ago and took it to AMS. i got the head from a friend that rebuilt it( so he says). so the tuneup couldnt of been to long ago.


i think its something w/ the head most likely. all my friend say that the noise is to fast to be the bottom end.

 

[GTM]

ijust paut my car back together acouple months ago and took it to AMS. i got the head from a friend that rebuilt it( so he says). so the tuneup couldnt of been to long ago.


i think its something w/ the head most likely. all my friend say that the noise is to fast to be the bottom end.

You can pull one spark plug lead at a time while the engine is running, if the noise changes or can't be heard then then suspect rod bearing. Main bearing can be diagnosed this way but with less success. If you pull the valve cover off then try to wiggle each cam follower, this will require rotating the engine so the cam lobes are up. If any are loose then suspect the hydraulic lifters. Make sure all the spring hats are level when they should be or you have bent valves.

You are sure all the exhaust brackets are tight and no heat shield is loose. You can use a 3' long piece of garden hose as a listening device which you can point around to better locate the region. Do look at the front pulley, the dampner can break and cause noises as it wobbles.

It bugs me you think it could be coming from the intake, how could anything get in there?? People can do some mean things like tossing nuts and bolts when things are apart. You can pull the throttle body off and see if you have any nicks on the inside of the manifold, chase with a magnet. This is very rare and should only be considered when all else has been checked.

Cheers,
GTM

 

[clipise]

"You can pull one spark plug lead at a time while the engine is running, if the noise changes or can't be heard then then suspect rod bearing. Main bearing can be diagnosed this way but with less success. If you pull the valve cover off then try to wiggle each cam follower, this will require rotating the engine so the cam lobes are up. If any are loose then suspect the hydraulic lifters. Make sure all the spring hats are level when they should be or you have bent valves."-

ill check that tonight. should i rev the engine too? because when i rev the enigine the noise fads out alittle bit. and when i release the throttle, u can hear it well.

"You are sure all the exhaust brackets are tight and no heat shield is loose. You can use a 3' long piece of garden hose as a listening device which you can point around to better locate the region. Do look at the front pulley, the dampner can break and cause noises as it wobbles."-

im pretty sure they are. AMS put my turbo on. and i have no heat sheld. the dampner is fine, ill check again to make sure. i took off the oil cap and tried to hear anything thinking the head could be the problem. i couldnt tell, ill try the garden hose.

"It bugs me you think it could be coming from the intake, how could anything get in there?? People can do some mean things like tossing nuts and bolts when things are apart. You can pull the throttle body off and see if you have any nicks on the inside of the manifold, chase with a magnet. This is very rare and should only be considered when all else has been checked."-

the reason why i think so is because thats where the noise seems to be coming from. i figure since i got the cyclone intake mani, the runners possibly gotten lose and could cause that noise. now, i dont think that the intake mani is the problem, im guessing the engine.

but if its the bottom end, wouldnt the car idle and performe funny? i drove it to work when the noise just started. i was on the highway and my rpms where at 2800- 3300 rpms for about 15 mins. when i got to work the noise was louder and the idle was at 750-800rpms. driving the car home was they same way and the noise i belive stayed the same. but when i crank it over u can hear the noise when cranking it over and kinda sounds like 2 quick ticks.

thanks for help!

 

[GTM]

...

but if its the bottom end, wouldnt the car idle and performe funny? i drove it to work when the noise just started. i was on the highway and my rpms where at 2800- 3300 rpms for about 15 mins. when i got to work the noise was louder and the idle was at 750-800rpms. driving the car home was they same way and the noise i belive stayed the same. but when i crank it over u can hear the noise when cranking it over and kinda sounds like 2 quick ticks.

thanks for help!

No, the rods and mains will not influence idle or running. I gather you don't have an oil pressure gauge that you can trust?

This is not sounding good, everything you keep adding just makes me more convinced it's a rod bearing. You can use a long screwdriver or wooden dowel pressed up to different sections of the block and head. Do keep the rpm down, don't lug it but nurse this puppy home for it sounds bad hurt. Rod bearings are most noticable in the 2000 rpm range. In desperation you could if you establish which spark plug leave it off so as to minimise load for you don't want it poking a hole in the side of the block.

It sounds bad enough that you might consider towing it, the fact you hear while cranking tells me it's very bad... do check the crank pulley. I hope I'm wrong but I would rather err on the conservative side and have it be something else than to give you a false sense of security. Do make sure you have plenty of oil if you must drive it home. Tell me it's not true that's all I want to hear, tell me it's something stupid and you were just feeling paranoid.

Cheers,
GTM

 

[AMS Eric #2]

"You can pull one spark plug lead at a time while the engine is running, if the noise changes or can't be heard then then suspect rod bearing. Main bearing can be diagnosed this way but with less success. If you pull the valve cover off then try to wiggle each cam follower, this will require rotating the engine so the cam lobes are up. If any are loose then suspect the hydraulic lifters. Make sure all the spring hats are level when they should be or you have bent valves."-

ill check that tonight. should i rev the engine too? because when i rev the enigine the noise fads out alittle bit. and when i release the throttle, u can hear it well.

"You are sure all the exhaust brackets are tight and no heat shield is loose. You can use a 3' long piece of garden hose as a listening device which you can point around to better locate the region. Do look at the front pulley, the dampner can break and cause noises as it wobbles."-

im pretty sure they are. AMS put my turbo on. and i have no heat sheld. the dampner is fine, ill check again to make sure. i took off the oil cap and tried to hear anything thinking the head could be the problem. i couldnt tell, ill try the garden hose.

"It bugs me you think it could be coming from the intake, how could anything get in there?? People can do some mean things like tossing nuts and bolts when things are apart. You can pull the throttle body off and see if you have any nicks on the inside of the manifold, chase with a magnet. This is very rare and should only be considered when all else has been checked."-

the reason why i think so is because thats where the noise seems to be coming from. i figure since i got the cyclone intake mani, the runners possibly gotten lose and could cause that noise. now, i dont think that the intake mani is the problem, im guessing the engine.

but if its the bottom end, wouldnt the car idle and performe funny? i drove it to work when the noise just started. i was on the highway and my rpms where at 2800- 3300 rpms for about 15 mins. when i got to work the noise was louder and the idle was at 750-800rpms. driving the car home was they same way and the noise i belive stayed the same. but when i crank it over u can hear the noise when cranking it over and kinda sounds like 2 quick ticks.

thanks for help!

Does it sound bad enough to not drive it to the shop? If you bring it by one day I can definatly walk outside for a minute and take a listen to it for you. I hate to think something major has happened RIGHT after you put so much money into this car. It sounded really good when it left. It definatly had no hint of bottom end noise that I could hear, and I can definatly hear noises like that like a hawk. These ears have many years of training......

 

[12's]

I am guessing lifter tick.

 

[clipise]

my stock oil gauge works. it reads right before the line that has the "H" for high. it reads high because my balance shafts are removed.

the car is already at my house. trust me, i dogged it home. actually, when i was hopping on the express way, i forgot what was wrong w/ my car and accelerated like normal to get up to speed. it runs fine besides the noise. im thinking about take back to ams, but the thing is that, its like 45min away. trust me, im thinking about taking the chance anyways. when the car left ams, it was the best i sounded ever.

oh yea, i took out one spark plug at a time like u said GTM, and the noise was still there?

eric, chris black( had a black 1g talon u tuned) checked out my car and he said it could be the manifold or i new my vavles adjusted?

oh off topic, i replaced the knock sensor on it. now at least the CEL isnt on no more. funny how i fix something and something else goes wrong .

thanks,

 

[GTM]

my stock oil gauge works. it reads right before the line that has the "H" for high. it reads high because my balance shafts are removed.
...
im thinking about take back to ams, but the thing is that, its like 45min away. trust me, im thinking about taking the chance anyways. when the car left ams, it was the best i sounded ever.

oh yea, i took out one spark plug at a time like u said GTM, and the noise was still there?
...
or i new my vavles adjusted?
...
how i fix something and something else goes wrong .
thanks,

Rod and main bearings will push extra oil when they get badly worn thus loss of oil pressure so you may be good there.

You have the offer of someone to take a listen which you need to do, nothing like a well trained professional to give a once over to dismiss major problems.

Do you have _mechanical_ lifters??

Sitting behind a monitor 2000 miles away and trying to diagnose noises is next to impossible. Did you try the long screwdriver/wooden dowel or the hose to try to isolate left right front back top bottom??? Do watch for belts and other rotating devices for you can get so engrossed and get a good scare.

Badly adjusted valves _can_ cause rough idle more so if too tight but then they don't make noise. Your early descriptions had me quite worried something was going to let go. This is not to say that an extriemly loose valve cannot cause serious problems especially if the cam follower starts to hop out and turn on it's side.

Take it easy until you know for certain and get if fixed.

Cheers,
GTM