RATTALING NOISE AT 3000 rpm!!
 

i have a non-turb auto tranny 1989 supra 75,000 on the meter. i just changed my oil with valvoline? 20W and ever since it made the rattling sound... i rev it to about 3000 rpm (around there) and it just starts to rattle. also when i gas it it also rattles around 30-40 miles.

20w is awful thin viscosity. Old oil ends up that thing after a few thousand miles. Try putting some 50w oil in along with some STP or same type additive. It sounds like your engine is on its death bed with the rattling. Usually that means the connecting rod bearings are worn out. That usually happens with age, but also with low oil. After a while the oil seals leak and it only takes a few seconds of no oil to the bearing surface and the bearings and crank need rebuilding.

Let someone who might be familiar with engines listen to it. They don't have to be a Toyota expert because all bearing noises sound similar. There is no fix other than pulling the engine and getting it rebuilt or just replacing the engine.

Let us know.

Russ

Sounds like what happened to my baby. It's in the middle of a rebuild and currently at the machine shop.

my engine only has 75,000 i dont think it should have any problems. the engine was fine before i changed the oil, its probably because of the oil..i hope!! i hope!! im going to change my oil, i just bought mobil 1 15-50w. well i hope it works just fine, if not im going to swap with a 1jz-gte. you guys know how much it cost for a 1jz-gte JDM? im guessing about 1500? well i hope everything goes well. if my 7m-ge works then ill just add some aftermarkets on that bby.

Unfortunately, It isn't always about the mileage. It's about how well it was taken care of during those miles that matters. If it ran low on oil for a while, or ran on old oil for some time it could mean curtains for the engine.

Good luck.

well i just changed my oil to mobil 1 15-50w its top of the line oil. yet i still get the knocking noise. i dont think my dad took good car of that thing. well i still didnt get a tune up and now im guessing its the CAT converter. i dont know if my engine rattles or the CAT. maybe its the CAT or the engine, im going to have a professional look at it. ill update

I hope you don't have a case of rod knock (spun bearing).

Different people have different opinions, and mine is to go with the oil that is recommended for the car.
Thicker oils don't flow as well as thinner oils and oil flow is important.
Don't want to start a debate on all that but many do feel as I do on the topic.
I do like to question things in hopes for improvement, but I do so mostly when I know full well the reason why things are the way they are and what the Toyota engineers were thinking, instead of just ignoring their recommendations without much basis to do so.

EDIT:
Here is a link to what one case of a spun bearing sounded like.
Keep in mind that they may not all sound the same and may sound even more differently in front of you than by this recorded file played by your computer.

http://www.geocities.com/ma71supratu...h/rodknock.mp3

Thanks to Jeff Gore (MA71supraturbo) for hosting that file!

All you may have to do is turn the engine off and knock the cat converter with a stick or something and see if it rattles. It will be a higher pitched rattle than the rod knocking. The noise should be easlily separated from each other with the hood open.


As for oils. A lot has changed since these engines were first engineered. Synthetic oils, more additives, oil for older engines and so on. As an engine gets older the clearances increase and thus a drop in oil pressure. Most people go with age and the temps from where they live as to viscosity choice. I live where it gets very hot in the summer, but not too cold in the winter, so I use a 40wt during the summer. If I had and engine that was rattling and was trying to make it last a little longer, I would use 50wt, STP oil and a can of engine restore for 6 cylinder cars. You can't expect that engine to last too long and the longer you do run it the more expensive it will be to rebuild.

Don't break it. Get it diagnosed by someone who can pinpoint that noise. Let us know.

Russ