Noise from the front bottom of engine?

Hi



I have a 1996 Tacoma 2 wheel drive automatic transmission 2.4 engine.



I have like a bearing noise when I idle but when I give it the gas It goes away.



Any guesses



Brian

Reply 1 : Noise from the front bottom of engine?

I think it's timing belt related. Does any one know how long it takes to replace the guides on the timing chain? Or how much it would cost to have someone do it ?



Thanks

Brian

Reply 2 : Noise from the front bottom of engine?

Quote:

Originally Posted by brbpab94 I think it's timing belt related. Does any one know how long it takes to replace the guides on the timing chain? Or how much it would cost to have someone do it ? Thanks Brian

Before jumping to any conclusions, remember engine noise has a way of resonating amongst all the other moving components within the engine bay. Therefore making a perfectly fine component sound like the component at fault. So i would really take a listen around with the engine idling to really pinpoint the exact spot and note what type of bearing noise it is (high pitch metallic knock, low hollow knock, ect). If you can pinpoint the exact spot of the noise we can more than likely identify the component responsible.

Reply 3 : Noise from the front bottom of engine?

Quote:

Originally Posted by brbpab94 I think it's timing belt related. Does any one know how long it takes to replace the guides on the timing chain? Or how much it would cost to have someone do it ? Thanks Brian

You're 2.4 has a timing chain, not a belt. It does not require scheduled maintenance, but that's not saying that it can't fail.



Try removing the serpentine belt, and start the engine just long enough to ascertain if the noise is gone. If the noise is gone, you may have a bad idler pulley or belt tensioner pulley. If your luck isn't that good, you may have a bad bearing in the waterpump, alternator, p/s pump or other belt driven accessory. With the engine shut off and belt removed, you should be able to spin each pulley by hand to see which is the culprit.



Good luck!