Lately, I've been getting a clicking/knocking noise when driving off from a cold start, at about 1500 RPM, with the vehicle in my signature. If I let off the gas and pull to the curb for a few seconds, it goes away. It runs perfect when it's warm and sounds the same way it did when it was new.
The first time I had the noise was in December when I was about 5K into an OCI with Peak 5w30 SM and a P1 filter. I changed both the next day with MC 5w20 SS and an OEM filter and the noise went away for about a month and a half.
But lately it's been coming back, and more frequently. Probably 3 or 4 times in the last two weeks, including both cold mornings near freezing and a very warm morning (for winter) we had when it was around 60 degrees. I am only about 1500 miles into my latest OCI, and I am loath to change the oil again to try to attempt a fix. Not sure that was really the fix anyway.
It seems like the longer I sit after a cold start, the less likely the noise is to happen. Especially after a start that was normal and without much if any noise. Plus I have been programmed for a while to drive off quickly but gently after a cold start to minimize fuel dilution. Maybe I just need to let it run for 15-30 seconds before driving off.
What could this be?
-a rod knock?
-oil not yet circulated to the top of the engine?
-cam phaser oil passages plugged?
-timing chain noise?
-something else?
I looked under the valve covers last summer and the valvetrain looked like new. The car currently has 64,xxx miles on it. Any thoughts?
The first time I had the noise was in December when I was about 5K into an OCI with Peak 5w30 SM and a P1 filter. I changed both the next day with MC 5w20 SS and an OEM filter and the noise went away for about a month and a half.
But lately it's been coming back, and more frequently. Probably 3 or 4 times in the last two weeks, including both cold mornings near freezing and a very warm morning (for winter) we had when it was around 60 degrees. I am only about 1500 miles into my latest OCI, and I am loath to change the oil again to try to attempt a fix. Not sure that was really the fix anyway.
It seems like the longer I sit after a cold start, the less likely the noise is to happen. Especially after a start that was normal and without much if any noise. Plus I have been programmed for a while to drive off quickly but gently after a cold start to minimize fuel dilution. Maybe I just need to let it run for 15-30 seconds before driving off.
What could this be?
-a rod knock?
-oil not yet circulated to the top of the engine?
-cam phaser oil passages plugged?
-timing chain noise?
-something else?
I looked under the valve covers last summer and the valvetrain looked like new. The car currently has 64,xxx miles on it. Any thoughts?