When i start the car, it makes a knocking noise. Has always had oil in it, and not too much. It started about a month ago and it is only when it is cold. I dont know what to do?? But it goes away after the car has warmed up. HELP ME!!!
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Your hearing lifter noise common in most cars in cold weather I have a 2001 sc1 same engine as yours here's how to get rid of that ticking sound go buy a quart of Lucas synthetic motor treatment change your oil and leave it 1 quart low add the Lucas synthetic oil stabilizer within 1 week you will not hear the noise agian reason your hearing the noise is there's no oil at the top of the engine on a cold start oil when cold is thicker hints why your noise in your engine what Lucas does is eliminate the dry start by the way my engine has 288,000 and does not use a drop of oil after you use this product you should use it every oil change you will see your car will thank you regards Chris
With so little information, I would HAVE to assume that this is a rod knock. Does it make noise in neutral too? Or only when you drive it. Try to put it in neutral and step on the gas....Does it still knock? A rod knock means you need to rebuild that motor. A rod knock can usually happen from beating on the car or a timing belt slipped a couple of gears. I would check your engine oil level, not transmission. Because low levels of engine oil can create this sound too. Good luck and feel free to write me back with much more detail so that I can further assist you.
It is probably your lifters sticking. Check your engine oil level and if thats fine, then add some oil detergent/additive that says it will "reduce engine knock and free sticky lifters" run with that additive for a couple hundred miles or until the noise gets better. then replce your oil after that without using the additive
Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Check the engine for compression. Your head gasket may be shot. I have a 97 that had a similar problem, and we did the head gasket, car runs fine now. Prior to doing the gasket mine wouldn't start at all.
The idle issue is normal. The idle is controlled by the ECU. There are no adjustments for the idle. Regarding the knocking noise, that could be several things, and I am hesitant to comment without hearing it. Take it to a Toyota Dealer & have a tech listen to it. We are very good at identifying noises on the service drive.