corolla engine chain issue

[evil]

Hey all i am driving a 2002 corolla with 163K on it. I hear knocking noises from my car usually when i m going uphill or when i accelerate at a high rpm i hear it specially on a HOT day. Any idea what it could be?

[huangxin]

does it sound like tiny marbles bouncing around inside the engine?

if so, i'm thinking it's detonation problem.

[spanke311]

I had very similar noises on mine; it started light, then got louder as I drove it for about 25k. Various people listened to it and had different theories on where it was coming from. Well, it turned out to be a spun bearing, and since I drove it I damaged/scratched the crankshaft; I'm currently rebuilding the engine. I recommend to stop driving it for a minute, drain the oil, remove splash guards, and pop the oil pan off to inspect the rod ends. If any one rod feels looser than the other, you've got a problem. Regardless, while you're there, its a good idea to replace all the rod bearings. This will give you a chance to inspect the old bearings, look for scratching, excessive wear, ect. If it is a rod problem and you caught it early enough, you might buy quite a bit of time for your engine by polishing the crank (where the problem is) and replacing the bearings. Detonation wasn't even close to happening on my car, according to my machanic. Hope this helps..

[huangxin]

quit scaring the guy

rod knock does appear at 2 to 3k rpm range, but it quiets down when there's load on the engine. in this case, the knock appears when under load.

also, a rod knock would be there all the time, not when the weather is hot.

[1zzfeprizm]

it could be a rod bearing if its when you step on it could be the bearing

[glow-plug]

Try a couple of tanks of premium fuel under the same conditions.