Belt slip noise in manual mode shifting >5.5k rpm?
09-09-14, 10:18 AM
#77
Lexus Fanatic
Its got to be the tensioner pulley because it was fine for months and then just started doing it very very slightly ( chirp) and the mild whine.
09-23-14, 10:49 AM
#78
I have a 2012 with 30k miles. It has the exact same sound as in caymandriver's track video.
It sounds more like a scratch to me under hard shifts near redline.
Similar sound to describe it to is when you're powershifting a manual tranny car and the syncros are worn, it goes in but it kinda grinds/scratches. At first I thought it was the transmission itself, but I'm glad I found this thread. What a relief.
Dropped the car off at the dealership and had one of the service advisors go with me for a drive, he said it doesn't sound like the belt. He said he will open a case for it.
Oh well, in the meantime I'm stuck with an IS250 loaner, which is probably one of the slowest things I've ever driven. I swear my old Prius would have given it a good run.
It sounds more like a scratch to me under hard shifts near redline.
Similar sound to describe it to is when you're powershifting a manual tranny car and the syncros are worn, it goes in but it kinda grinds/scratches. At first I thought it was the transmission itself, but I'm glad I found this thread. What a relief.
Dropped the car off at the dealership and had one of the service advisors go with me for a drive, he said it doesn't sound like the belt. He said he will open a case for it.
Oh well, in the meantime I'm stuck with an IS250 loaner, which is probably one of the slowest things I've ever driven. I swear my old Prius would have given it a good run.
09-23-14, 01:09 PM
#79
Lexus Champion
iTrader: (20)
I have a 2012 with 30k miles. It has the exact same sound as in caymandriver's track video.
It sounds more like a scratch to me under hard shifts near redline.
Similar sound to describe it to is when you're powershifting a manual tranny car and the syncros are worn, it goes in but it kinda grinds/scratches. At first I thought it was the transmission itself, but I'm glad I found this thread. What a relief.
Dropped the car off at the dealership and had one of the service advisors go with me for a drive, he said it doesn't sound like the belt. He said he will open a case for it.
Oh well, in the meantime I'm stuck with an IS250 loaner, which is probably one of the slowest things I've ever driven. I swear my old Prius would have given it a good run.
It sounds more like a scratch to me under hard shifts near redline.
Similar sound to describe it to is when you're powershifting a manual tranny car and the syncros are worn, it goes in but it kinda grinds/scratches. At first I thought it was the transmission itself, but I'm glad I found this thread. What a relief.
Dropped the car off at the dealership and had one of the service advisors go with me for a drive, he said it doesn't sound like the belt. He said he will open a case for it.
Oh well, in the meantime I'm stuck with an IS250 loaner, which is probably one of the slowest things I've ever driven. I swear my old Prius would have given it a good run.
that scratch sound is normal. does have a similar sound to bad syncros on a manual car. no torque converter on shifts from 2nd to 8th
09-23-14, 07:01 PM
#81
Oh whooops. So that scratching noise is completely normal and not belt slippage? Yikes...I feel bad... the dealership said they will go ahead and replace the belt for me and tensioner under warranty. I told them because the forum I visit says that is the fix. lol talk about amazing service..
09-25-14, 05:52 AM
#83
Tech Info Resource
iTrader: (2)
Yeah, the word is finally getting around about this problem. Unfortunately it will return. AMHIK.
09-25-14, 09:25 AM
#85
Lexus Test Driver
I always thought it was the blow-off valve...
I kid, I kid.
Interesting. I have had the LSB performed and the car still exhibits it. 2008 with 57,000mi.
I kid, I kid.
Interesting. I have had the LSB performed and the car still exhibits it. 2008 with 57,000mi.
09-25-14, 10:14 AM
#87
Belts, Maybe Tensioner
I'm becoming more informed concerning the idiosyncrasies of belts and sometimes tensioners. What is being described here is a relatively common problem with diesel engines like the larger Cummins types. These motors never see 2500 RPM and yet they make these odd sounds. I was originally told to replace the belt and tensioner, but when I went for parts at a large commercial truck shop, I was told to forget the tensioner and just get a new belt. They said get a good one. They said they run into it a lot.
Even though the belt only had about 6000 miles, I replaced it and by by issue.
I looked at the old belt for quite awhile and determined that even though the belt was serviceable, it had a number of nicks in the groves and even a couple of small holes. I think road debris had caused the damage. The nicks and small holes probably are acting like a musical instrument as they cross the pulleys and tensioner where air is squeezed out or around the groves.
Try a good quality new belt first.
Even though the belt only had about 6000 miles, I replaced it and by by issue.
I looked at the old belt for quite awhile and determined that even though the belt was serviceable, it had a number of nicks in the groves and even a couple of small holes. I think road debris had caused the damage. The nicks and small holes probably are acting like a musical instrument as they cross the pulleys and tensioner where air is squeezed out or around the groves.
Try a good quality new belt first.
09-25-14, 05:20 PM
#88
Tech Info Resource
iTrader: (2)
I'm becoming more informed concerning the idiosyncrasies of belts and sometimes tensioners. What is being described here is a relatively common problem with diesel engines like the larger Cummins types. These motors never see 2500 RPM and yet they make these odd sounds. I was originally told to replace the belt and tensioner, but when I went for parts at a large commercial truck shop, I was told to forget the tensioner and just get a new belt. They said get a good one. They said they run into it a lot.
Even though the belt only had about 6000 miles, I replaced it and by by issue.
I looked at the old belt for quite awhile and determined that even though the belt was serviceable, it had a number of nicks in the groves and even a couple of small holes. I think road debris had caused the damage. The nicks and small holes probably are acting like a musical instrument as they cross the pulleys and tensioner where air is squeezed out or around the groves.
Try a good quality new belt first.
Even though the belt only had about 6000 miles, I replaced it and by by issue.
I looked at the old belt for quite awhile and determined that even though the belt was serviceable, it had a number of nicks in the groves and even a couple of small holes. I think road debris had caused the damage. The nicks and small holes probably are acting like a musical instrument as they cross the pulleys and tensioner where air is squeezed out or around the groves.
Try a good quality new belt first.
09-25-14, 05:55 PM
#89