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Mike....I will be very interested to find out your results and I am looking to re-test tomorrow or later today considering I only ran it at idle for about 3 minutes.
If you want me to come over and push on the hose so we can get some better data, let me know.
Mike....I will be very interested to find out your results and I am looking to re-test tomorrow or later today considering I only ran it at idle for about 3 minutes.
If you want me to come over and push on the hose so we can get some better data, let me know.
Hey Paul, I'm the OP. I was hoping a few others who were concerned about this issue would try securing the pipe to see if the start-up noise went away.
I am going to unhook the make-shift velcro strap I now have securing mine and see if the noise returns. But unfortunately I had to put down my dog last week, a 16 1/2 year old shih tzu. I just haven't been it good spirits to do much anything since.
But I will get around to test mine soon and report. Let me know how yours goes.
If this turns out to be a "thing" a lot of owners will be mighty relieved.
True - this one did sound a little different than what my car usually does. When I heard Paul's car in person, it sounded exactly like mine, I thought. I'll have to check this out.
The one with the arrows: the single tip arrow is pointing to the rubber hose that attaches to the aluminum pipe that then runs rearward. The double tipped arrow shows the make-shift velcro strap that I have holding the pipe secure. It wraps around the rubber portion then around the metal bracket of the SAI pump. It more less prevents the coolant pipe from moving side to side. If you look close I also have a plastic clip tie holding the straps down so it does not slip up and off the pipe. This was the easiest way to secure it temporarily without having to actually get back in there and replace the OEM clip which is actually on the aluminum portion.
If your clip is completely missing, you can grab where I show the single tipped arrow and pull left and right, and the pipe will move several inches from left to right. As you do this look back at the aluminum portion and you will see it moving sie to side.
FYI. The single tipped arrow is a good place to hold the pipe (the rubber part) when you cold start it. If you hold it here instead of actually reaching back and grabbing the aluminum portion, just make sure you push towards the left side of the car. It's not really an up and down motion that this pipe has when it rattles, it's side to side.
The other photo simply traces the route of the velcro strap.
Sorry in advance if the photos are rotated...
Also, Paul, if I understand correctly, yours may be rattling even with the clip intact. Maybe the case that the clips look intact, but have become loose and not supporting the pipe as it should. Just a thought.
Best test is to have a competent friend grab the pipe at start up as the slapping/tapping is occurring and see if it stops abruptly.
Gotcha. I just couldn't tell from your photos in post #20 whether that big clip is missing and wondered if it would help.
Cool. Even if that clip is missing, given the hose is rubber at that portion it wouldn't make much noise since it's rubber. The aluminum section will if it gets to dancing around.
True - this one did sound a little different than what my car usually does. When I heard Paul's car in person, it sounded exactly like mine, I thought. I'll have to check this out.
maybe just a hunch, but when I did the 30k service on my car
I paid special attention to reinstalling the heat shields
(I had the bumper off as I was installing aftermarket muffys)
when I think about the construction of those shields and the sounds they made when being handled
yours could be just as simple as that, a loose heat shield
Good finding btw. I'm sure some can benefit from it.
Thanks, but we haven't yet confirmed a correlation.
As I mentioned earlier, my car has made this noise upon cold start since I've owned it (going on 2 years and 8K miles, many cold starts.) Once I secured this pipe, noise gone and yet to return as of about 10 cold starts.
I am going to undo the velcro strap and see if the noise returns, but haven't yet done so. When I do, and if the noise returns, well then we have correlation.
Just did another test....had the knocking noise, put my hand on rubber coolant pipe (which I had put a tie wrap around the factory connector between it and the smaller pipe) and it made the noise for just a few seconds and I can't tell if anything I did made it go away or if it just wasn't "cold" enough from this morning. I only idled it for about 3 minutes this morning.
Just did another test....had the knocking noise, put my hand on rubber coolant pipe (which I had put a tie wrap around the factory connector between it and the smaller pipe) and it made the noise for just a few seconds and I can't tell if anything I did made it go away or if it just wasn't "cold" enough from this morning. I only idled it for about 3 minutes this morning.
Paul, next time you try this, remove the snorkel so it is out of your way and grab the pipe on the rubber portion (post #20, bottom photo, single tipped arrow). It connects to the aluminum pipe in question. Best way is to push it to the left which traps the aluminum pipe against the side of the car and holds it tight. As soon as you do this the noise should stop immediately if yours is like mine. Squeezing your fingers in like you do in the video is not as effective.
If your clip is totally missing you should also be able to push it to the left and right. You will feel about 2 or 3 inches of travel. I believe it is the side to side motion that is of concern not so much it bouncing up and down. Given our engines are flat sixes the vibration is more side to side. Then once the pipe pressurizes and the rubber connector pipes stiffen the aluminum portion is stable enough and the slapping/tapping stops.
So I did another test this morning, I have to take back what I said yesterday.....the pipe seemed to have nothing to do with the noise. I think it was just so warm out that the noise went away so fast at idle, like less than 30 seconds. If it's cold outside, say less than 60 F, it continues to make the noise longer.
08-02-2017, 12:57 PM
