Cold start… engine sound
#1
SEANTRANFOO :)
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Location: Santa Ana, California
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Cold start… engine sound
2016 rdx
Bought cpo at 30k
currently 80k
Just two months ago. The rdx has been making this sound. I’m not too sure what it is.
at first maybe it was the oil filter / oil. It fixed it for about 1 week and now it’s worse. Been reading through the forums, however did not find anyone with this problem.
https://youtube.com/shorts/chZq18a3Um4?feature=share
Bought cpo at 30k
currently 80k
Just two months ago. The rdx has been making this sound. I’m not too sure what it is.
at first maybe it was the oil filter / oil. It fixed it for about 1 week and now it’s worse. Been reading through the forums, however did not find anyone with this problem.
https://youtube.com/shorts/chZq18a3Um4?feature=share
#2
First you need to determine where the sound comes from, it can be top, bottom and timing mechanism. The sound is very much like a rocker arms, so if you determine that the sound is coming from the top, well, you need to remove the valve covers and visually inspect whether all the VTEK springs are in place. The noise is very similar
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seantranfoo (10-01-2022)
#4
I don’t know, it needs to be disassembled and diagnosed.
#5
alexmed2002
#6
The advantage of our engines is that there is no chain and if you can’t find anything visually, then you can put on the intake manifold without valve covers and start it for a short time to find out the exact place of the knock.
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Alex Medeiros (10-02-2022)
#7
Three Wheelin'
But how does the VCM work? Does it open valves in dead cylinders and cut the fuel to the injector. Might the noise come from the valve mechanism? Is there a solenoid that activates the system and it is not working as intended. Just a guess.
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#8
I am not all that familiar with my RDX other than doing general maintenance at the moment since it is low mileage and a daily driver.
But how does the VCM work? Does it open valves in dead cylinders and cut the fuel to the injector. Might the noise come from the valve mechanism? Is there a solenoid that activates the system and it is not working as intended. Just a guess.
But how does the VCM work? Does it open valves in dead cylinders and cut the fuel to the injector. Might the noise come from the valve mechanism? Is there a solenoid that activates the system and it is not working as intended. Just a guess.
#9
Three Wheelin'
As for the injectors, do we still want them to spray even when the cylinder is not firing? If I can cut individual injectors on my scanner, the ECM can also if a mode such as VCM is enabled.
In any case, it would be nice to see a full explanation from Honda on this system.
#10
Well the VCM technology is a first for me.
As for the injectors, do we still want them to spray even when the cylinder is not firing? If I can cut individual injectors on my scanner, the ECM can also if a mode such as VCM is enabled.
In any case, it would be nice to see a full explanation from Honda on this system.
As for the injectors, do we still want them to spray even when the cylinder is not firing? If I can cut individual injectors on my scanner, the ECM can also if a mode such as VCM is enabled.
In any case, it would be nice to see a full explanation from Honda on this system.
#11
I've been trying to figure out mine as well (2016 RDX), somewhat similar. Only happens in cold weather when cold starting. I was advised that it might be the valves that need adjustment, which I will do at the 100k mile service (currently at around 93k).
Here are some clips:
Here are some clips:
#12
Three Wheelin'
Can't be a valve unless it does it all the time since they are a threaded adjuster and lock-nut type and not a hydraulic lifter.
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chilly731 (10-12-2022)
#13
Three Wheelin'
So what are the pressures within the cylinder as the engine is turning over with properly closed (air-tight) valves? Do the valves close at the bottom of the stroke, the top of the stroke or mid-way?
As expected.
As expected.
#14
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