My issue started happening a few weeks after I purchased the car. Only put about 300 miles on it and then the issue occurred. Please help. Oh by the way, my car is a 1990 300zx Non-Turbo 5 speed manual.

First vid is a sound coming from my passenger side.

http://www.youtube.com/watch?v=eLFMQ0p5has

Second Vid is a flapping type sound when the car is in gear and when the RPM'S hit 2000k-2500k. Above 2500k the sound goes away. In the vid you can hear me rev up the car when it's in neutral and you'll notice that it doesn't make a sound at all.

http://www.youtube.com/watch?v=ezeQMmnEg6w

One morning I noticed both of these sounds so they both occurred in the same time. What do you think it is?

 

Gurgling sound in the first one is most likely AIV's. Search how to remove them.

The second sounds like your cooling fan hitting your crank pulley. Check the blades on the fan for damage.

 

Weird, sorry for the newbie question. So the fan blade only spins when driving in gear? Because the flapping type sound only happens when its in gear and hits between 2k-2500k but when revving it in neutral at those rpm's the flapping is not there.

 

No, it'll always spin, however I suspect something's loose (either the fan itself or the crank pulley). The engine behaves VERY differently under load (in gear), and that could be contributing to the fan hitting the crank pulley. Did you check to see if there were marks on the fan? If it's hitting, there'll be visible scoring on the fan blades.

 

Thanks for all the help Zlover, I'm actually at work and get off in about an hour. Is the fan visable under the hood or do I need to remove parts to view it? I've never worked on a nissan before only on my Camaro SS. Thanks for all the help, greatly appreciate it.

 

The part you'll need to see is visible without removing anything. Just look at the back of the fan blades... turn the fan with your hand and feel the edges. If they're scraped up, they've been hitting the pulley.

The fan would also explain why the sound goes away at higher rpms. The faster the engine is turning, the faster that fan is turning. Because of the pitch of the blades, high fan speed will pull the fan away from the motor (thus pulling it out of the path of the crank pulley), thus the sound goes away. At lower rpms, the blades aren't pulling away from the engine, and it'll contact the pulley if one of them isn't properly installed.

 

Thanks, I will make sure to check it when I get home and give you feedback and what I find. I'm curious, what if it is the fan blades hitting the pully. How do I correct this?

 

Well the problem could be a couple things... I would suspect the water pump is shot, if the problem suddenly began. If the front end of the engine has been worked on recently, it could just be that the fan clutch wasn't tightened properly, or that the crank pulley wasn't torqued down enough.

When mine began doing it suddenly, the bearings on the water pump had gone bad, thus allowing the water pump pulley (to which the fan clutch bolts) to wobble, causing the fan to hit the crank pulley in the process.

One of the times I refreshed my engine, though, I did once fail to tighten the crank pulley bolts sufficiently, thus resulting in the crank pulley wobbling and hitting the fan. The former is much more likely in your case though (unless, as I said, the engine has been worked on recently).

 

Oic, anyway it goes I probably will need to get in there and fix the problem. But if it is the fan blade being the issue atleast I know what's wrong with the car.

 

And as I said, the other noise is likely the AIV's. The AIV tanks are in the fenders, right by where you had the camera. There are several writeups on how to remove the system (it's useless).

 

Thanks, my brother has a lift at his shop so with that I should be able to get that AIV deleted, removed or whatever hahahaha.

 

Just checked the fan blades and I do not feel any scrapes. But I do see cracks though, I took pictures. Let me know what you think.

 

zlovers diagnosis is based on the fact that the car is under a load, so this may be a good time to point out what you did to me in the other place that you posted this thread... the fact that it isn't weather the car is in gear that matters, it's weather the clutch is in. which would disclude the fan. he meant scratches on the tips of the blade too.

 

Well I got the car about a month ago and after 300 miles on the car this problem happened. The only thing I did to the car was put new tires and replace the rotors and brake pads, oh yeah also an oil change.

 

So wait, when EXACTLY does the sound occur. When the clutch is pressed in (disengaged) or engaged? What were you doing with the car to make that noise occur and what changes did you make to get rid of the sound?

It's not your fan hitting your crank pulley, so that's a good thing... but it could be something worse.

 

Well in the vid my foot is pressed on the clutch all the way to the floor and it makes the noise only between 2-2500 rpm. But before 2k and after 2500k it doesnt make that flappy sound. I usually shift around 2500k and it still makes makes that sound because I'm in gear. But one thing I do notice is that its not that loud when I'm actually driving.

The night before I experience the issue all I was doing was driving the car normally and I've never driven it hard at all. Car seemed fine and the next morning is when I noticed both sounds. I know for a fact that when I bought the car it had no issues and what so happens the ca gives me issues. Do you think it can be my throwout bearing or vtc sprocket intake?

 

I've never gotten rid of rte sound since it happened. The only time it doesnt to it us when the car is idle or if reving up when in neutral it doesnt do it.

 

So it'll do it even if the clutch is engaged?

It's almost definitely not your VTC... I've never heard VTC make a sound like that.

 

Listening to this vid over and over again, it sounds like you rev it with the clutch engaged and it doesn't make the sound... if that's the case, it is definitely clutch-related.

 

the first few revs were wen the clutch was in firs gear and then I revved it up a few times it t on neutral (took it out of first gear).

 

after doing more research on it I kind of figured it may be clutch relatd became it only happens when its in gear.

 

Dude, no offense, but you became horrible at expressing yourself in written words somewhere in this thread (you started off just fine). Use punctuation and speak in sentences please.

For example
The clutch was in first gear? The clutch doesn't go in any gear... it's not inside the transmission.

The clutch pedal was pushed in (disengaged) and the transmission was in first gear. Is that what you meant?

And just so you know, if the clutch is pushed in (disengaged), it will not matter what gear the car is in, because there is no movement in the transmission until the clutch is engaged. Therefore, if the noise happens while you are pressing down the clutch, it is a clutch issue. If the noise happens while your foot is off the clutch, it is a transmission issue.

 

Okay got it, yes it happen when the clutch is in. When I'm driving a those RPMs let's say on the freeway or residential it doesnt happen.

 

It's related to your clutch or throw out bearing.

 

Okay, that shouldn't be an issue. I'm thinking its the throwout bearing because the clutch shifts fine.