After joining a few months ago and spending countless hours reading various thread history's, I feel I am starting to get a handle on the quirks of this platform.
A little background about me, I have been in the used car business for 10 years and fix all our purchase's. In house we do everything from light bulbs to transmission rebuilds.
I have gained much insight from others on this forum and hope to give back as well. If anyone is in the central Texas area, we are an hour north of Austin and need any advice or just BS time about our rides or passing thru please feel free to PM me. Pretty well kitted up for most issue's.
So hi to all, and now on to my issue.
I have got the strangest noise on my 2000 Lexus LX 470. It was not there when I bought it, it has gone from random to always there. Its a very strange noise that can only be described as "whooping" or "air" noise it builds in pitch and intensity as speed increases. It will happen also right after I let up on the throttle. I can make it happen at idle only around red line. If starting from a stop, it builds up to the shift points and then goes back to almost gone till RPM's build again. I took off serpentine belt and could not replicate.
So a few observations, Its rotational of engine, but not vehicle. I have replaced serpentine bet with new tensioner assembly. Upper idler pulley also. On other vehicles I would say vacuum leak and chase that down.
I do not think I have a vacuum leak as my fuel trims are flat, my O2's do not run out of spec to suggest a leak either. While I can, I have not run a smoke test to look for leaks.
I am not due for a timing belt, the previous owner had it done in 2012 at 40k miles ago. I am down to the point of doing the timing belt and water pump just to get a baseline and rule that out. Am i just running with my blinders on and its vacuum leak?
Anyone want to toss out some ideas?
Thanks in advance
A little background about me, I have been in the used car business for 10 years and fix all our purchase's. In house we do everything from light bulbs to transmission rebuilds.
I have gained much insight from others on this forum and hope to give back as well. If anyone is in the central Texas area, we are an hour north of Austin and need any advice or just BS time about our rides or passing thru please feel free to PM me. Pretty well kitted up for most issue's.
So hi to all, and now on to my issue.
I have got the strangest noise on my 2000 Lexus LX 470. It was not there when I bought it, it has gone from random to always there. Its a very strange noise that can only be described as "whooping" or "air" noise it builds in pitch and intensity as speed increases. It will happen also right after I let up on the throttle. I can make it happen at idle only around red line. If starting from a stop, it builds up to the shift points and then goes back to almost gone till RPM's build again. I took off serpentine belt and could not replicate.
So a few observations, Its rotational of engine, but not vehicle. I have replaced serpentine bet with new tensioner assembly. Upper idler pulley also. On other vehicles I would say vacuum leak and chase that down.
I do not think I have a vacuum leak as my fuel trims are flat, my O2's do not run out of spec to suggest a leak either. While I can, I have not run a smoke test to look for leaks.
I am not due for a timing belt, the previous owner had it done in 2012 at 40k miles ago. I am down to the point of doing the timing belt and water pump just to get a baseline and rule that out. Am i just running with my blinders on and its vacuum leak?
Anyone want to toss out some ideas?
Thanks in advance
