Loud knocking noise on cold start
08-13-18, 10:24 PM
#1
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Loud knocking noise on cold start
I have a 1999 RX300. 260,000 miles, second transmission, timing belt done a few years back. I don't it that much, but I'm keeping it and putting money back into it.
On a cold start, I'm getting a very loud knocking sound on the top of the engine. It lessens as the engine warms up, but doesn't completely go away. Thanks. PM260k
On a cold start, I'm getting a very loud knocking sound on the top of the engine. It lessens as the engine warms up, but doesn't completely go away. Thanks. PM260k
08-14-18, 08:24 AM
#2
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Since no one answered ,..
Check engine oil level.
For diagnosis you will have to take it to a mechanic for a hand-on inspection and even a check with mechanics stethoscope to narrow down the source of the problem. From the net you will get wild theories, one as good as another, but you need a hands on checking.
Salim
Check engine oil level.
For diagnosis you will have to take it to a mechanic for a hand-on inspection and even a check with mechanics stethoscope to narrow down the source of the problem. From the net you will get wild theories, one as good as another, but you need a hands on checking.
Salim
08-14-18, 05:41 PM
#3
Loud cold start noises are normally related to slapping belt, chain or tensioner..
You may also have it from VVT-I actuators, as they are oil pressure driven. Or, simply from rockers, if tappets are worn out and have to be replaced to adjust gaps.
You may also have it from VVT-I actuators, as they are oil pressure driven. Or, simply from rockers, if tappets are worn out and have to be replaced to adjust gaps.
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