quiggs12

I have an 88 Toyota Pickup 4WD, MT, 22RE. At cold start the engine (or something) makes a horrible noise at cold start. The noise lasts for anywhere from 10 seconds to 90. But it always goes away. After the noise stops the truck sounds good while at high idle. However, once the idle drops it has the occasional hitch. When the brake is depressed it acts like it wants to die. In addition, the engine (or something) will sporadically make a very loud noise. I say it is sporadic because there doesn’t appear to be any rhyme or reason behind when the noise appears while pressing the brake. I thought that maybe because of the idle-down effect that the brake booster was in trouble but I plug the vacuum hose from it and there was no change from how it reacts compared to when it is plugged in. I have three videos I would like anyone with knowledge to look at (PLEASE). One is the initial start up noise doing a semi-warm start. One is the engine reaction and noise when depressing the brake. And the final one (the long one) is a complete cold start with noise and shows how long it takes to go away. Any help would be greatly appreciated. Thanks

http://www.youtube.com/watch?v=QQccCi8gI5k
http://www.youtube.com/watch?v=GmclnntfZoo
http://www.youtube.com/watch?v=BCVNSK3upK0

Thanks

quiggs12

Sorry, I am not sure why/how the first video is one there twice (there is only one link to it in my post). Thanks in advance for not getting too mad.

alltracman78

Sounds like a slipping belt [I only listened to the last vid].

Start with the alt belt, but check them all.

*You can also put a very SMALL amount of dielectric grease on the belt, like a small fingertip full, on the belt. This will eliminate the squeal.
But make sure your belt is tight first, and make sure the belt[s] aren't badly worn.*

quiggs12

All the belts are new...

alltracman78

And?
A new belt can't be loose?
Or installed wrong?
That's even more reason they may be slipping, if they weren't installed correctly.

quiggs12

I think the belts are good (but will double check). Thanks

quiggs12

Definitely not the belts... did you watch the other videos?

toyota4x4907

GAWD! That is an AWFUL sound!!! I cant hear it clearly ( just the nature of cameras audio quality)

To me, it sounds external. Take all the belts off andi start it if you havent already. Dont let it run too long, though. Dont want to kill your battery.

Is the sound more prevalent higher up or lower on the engine? Can you isolate it to the front, middle or rear of the engine? Drivers or passengers side?

quiggs12

Sometimes I think there are two different sounds that are being made (not sure though). But it sounds like the front and near the power steering pump. I have a video with me looking under the truck. In the video I am depressing the brake (you hear the idle issue there) and I have to play around with the brake to get the noise to appear. Unfortunately it does. And you are right it sounds a little different in person due to the recording. But hopefully someone can help (keeping everything in mind as I doubt it is several different issues). Thanks

http://www.youtube.com/watch?v=Ka93E...ature=youtu.be

DeathCougar

iTrader: (23)

If you suspect its any of the accessories, just remove the belts. You can run a vehicle for a minute or two without any belts attached.

Start taking them off one by one, to eliminate possibilities. The sound quality is terrible, so its pretty much impossible for anyone to figure out what the problem is.

toyota4x4907

Try with all the belts off.

Are you or do you know someone mechanically inclined enough to take the valve cover off to check the timing chain? It doesnt sound like timing chain guide failures I have heard, but you never know.

Is your coolant full and burped?

quiggs12

I'll try taking the belts off one-by-one...

My timing is on (I have a timing light) and I checked to see if the guides were broken but they appear good considering how much of them I can see with a flashlight.

The coolant is full and burped (the alternator was recently changed (noise existed before though).

As far as the audio goes it is as good as a Samsung Galaxy S can provide. Thanks

alltracman78

First off, sorry for not listening to all the vids originally, I would have had a better answer for you if I had.
After listening to the rest of the vids it sounds like something external. I've never heard an internal engine noise like that [I've been a tech for 13 years].

^ This is what you should start with.
It may be an accesory [alt, pwr steering pump, ac] or it could be an idler/tension pulley.
It may also be your water pump.
You can actually run your engine for a while without the belts [except for the water pump belt, you shouldn't run more than a minute or two without that one].
You can run for a while without the alt.

quiggs12

So it appears that the noise is coming from my water pump and fan belt. However, the waterpump is only one year old and has 300 miles on it. Is it likely the fan instead (which I don't get either because it seems to be a clutch fan, right)? What do you think and why do you think it is a sporadic noise and not all the time? Thanks