89 240sx odd noise

[1989240sx]

hey guy i have an 89 240sx which is stock it has been making this odd noise for a while now and i am wondering what it is. i did search and what i found was bad timing chain tensioner or cat back heat shield. none of those thing i found was it. here is a link to the video of the sound it it makinghttp://s136.photobucket.com/al...6.flv

[Dimitri]

It sounds pretty unhealthy and serious. I 'd hate to guess wrong and freak you out but it doesn't sound like an engine you should be driving around. Take it to a shop if you have to.

[del82]

Exhaust gasket and...something else, but I can't really make it out over the sound of the bad gasket. That part is a cheap and easy fix, just be sure to spray your bolts with some penetrating lube first, after you get into the six digit mileage they tend to break when taking them off.

[destroyyourmind]

sounds like the exhaust gasket for sure could be a crack somewhere in your manifold also.

[1989240sx]

i did change the exhaust gasket when i replace my heads gasket but i will check it out. i know that my exhaust manifold it missing a bolt, someone broke it off when taking it. any other ideas would be great

[jdmxbB]

make sure you check your oil gauge.

and also look at the cam if it's getting oil or

not. it could be also. or a busted valve. it may

be possible.

[1989240sx]

i hope it is not busted valve

[1989240sx]

so i guess i should do a compress test to see if i have a bad valve what do i need to do a compress test

[locoluna825]

do you mind me asking why you have recently changed the head gasket?

[1989240sx]

the reason why i did my heads gasket it mess up when i put the timing chain so i did compress test and here what i got1 125 PSI2 125 PSI3 135 PSI4 130 PSI so if i have a busted valve the engine would not build up press so i still need to check the exhaust gasket update so i took the valve cover off there is oil up there and the is no movement in the lifers which is good thing
Modified by 1989240sx at 3:29 PM 4/11/2009

[1989240sx]

Happy Easter

[1989240sx]

ok guys i got my exhaust manifold off and the gasket does not look to be broken i have new one on the way is there anything else i could look at

[1989240sx]

what about the lifters ?? would they make a noise like that

[slidestyle69]

these numbers are not correct compression for ur motor....stock de compression is standard 179 or 180..minimum is around 150ish...re-do the check with the throttle wide open and get ur accurate readings....also warm the motor up to normal engine temp before hand

for future reference this is the correct and the only accurate way to check ur compression....Sry nobody chimed in with this 3 days ago...GOOD LUCK!

[1989240sx]

that is ok i still can't figure out what is wrong with the car the good thing i still have my 74 duster in running order the only bad thing with that car is no heat

[hustler01]

i couldnt tell you wat is causing it but you can go to walmart and for about 10 bucks buy a can of (SEAFOAM) use your vaccum line on the break booster and suck in about a third of the can, let the car set (not running) for bout 20 minutes, then fire it up and rev the engine up a few times. it will break down all the old gas and carbon build up in the exhaust and blow it out. make sure that you are not in a residential area when you do this. don't worry about the smoking it is just all the carbon breaking down it will eventually go away. i had a stuck valve in my s13 and this stuff fixed it right up.

[locoluna825]

The lifters on that year motor will make noise, as you have said before you removed the head off of your car. on the Sohc head, when the lifters are not properly bled they will make noise because of the air or contaminates that's now in them. I had this problem for a very long time after i had the head on my 240 worked on. I tried thicker motor oil and that helped the noise, a few lifters quieted up but 1 or 2 would still make the noise. The lifters on the SOHC are hydrologic so if any kind of crap gets on the head and into the lifters it will make noise.It kinda sounds like a little diesel. and it really annoying not to mention embracing. theirs a tutorial on how to properly bleed your lifters in here somewhere. i finally fixed mine, went to pick a part found another head and swapped the lifter assemblies, it just went away. so im pretty sure when they worked on my head some crap got in the lifter tappets.

[del82]

Ever get that gasket replaced? Btw, the gasket won't look "broken", but it'll have black streaks where its leaking. When you put the new one on, make sure to tighten the manifold from the innermost bolt to the farthest out. It's usually something you only have to worry about for headers with thin flanges, but it never hurts to play it safe.

[1989240sx]

yeah i have the gasket i am waiting for this weekend might work on it when i get home from work tonight not sure and i will have to try seafoam in the vaccum line, i am also think about putting in my oil take it out where there is no body and doing vaccum and oil at the same time and change my oil when i get back home and if that does not work i will take my lifter off, that should keep me busy this weekend

[1989240sx]

so guys i got my 240sx put back together and took it for a drive it does sound better but i can still hear that sound i have not use seafoam yet i really don't have a place to do it at really so i am think to do it early in the morning when everyone is still a sleep, also i try using my course control and it does not want to work, what it does is when i set it the rpm go down and then little bit after the rpm will go up little bit and course control will turn it self off what could cause this problem update sorry about the spell i mean cruise control and i know what is wrong with it. i also put some seafoam in my car this morning and i smoke pretty bad when i frist put it in i took it for a drive about 15 min and waited for 15 min and i did not get any black smoke out of the car i am guess i should have put it in and than turn the car off for 20 min and took off but i will try it again so time
Modified by 1989240sx at 11:32 AM 4/19/2009

[del82]

Can you do another recording of it? Hover the camera around the EGR system if possible, too.

The cruise control problem may be unrelated, btw.

i couldnt tell you wat is causing it but you can go to walmart and for about 10 bucks buy a can of (SEAFOAM) use your vaccum line on the break booster and suck in about a third of the can, let the car set (not running) for bout 20 minutes, then fire it up and rev the engine up a few times. it will break down all the old gas and carbon build up in the exhaust and blow it out. make sure that you are not in a residential area when you do this. don't worry about the smoking it is just all the carbon breaking down it will eventually go away. i had a stuck valve in my s13 and this stuff fixed it right up.

This isn't a bad idea, but you'll want to be careful, I'm pretty sure Seafoam spray is an etching cleaner; there's also a pour-in variety that's for the oil system, works similar to Marvel Mystery Oil, which can be used as an engine flush or top cylinder lubricant. Generally if you use this kind of stuff in the oil, you'll want to change the oil after running it thru the engine. It works great on the buildup, but you don't want it digging into the soft metal surfaces (bearings and such).

[1989240sx]

yeah i will take video over by the egr i have fix the cruise control problem yeah i change my oil when i use seafoam i am think the sound i am hear how is the exhaust system the muffler has hold in it i will post video tonight