Rattling noise when accelerating
Thread Starter
Driver School Candidate
Joined: May 2004
Posts: 29
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From: Washington
Rattling noise when accelerating
I have a 01' GS300 and over all it's been a very good, car no major problems. Recently I noticed that whenever the needle is just under 2k rpms (I think between 1850 rpms and 2k rpms) I can hear rattling sound, but it's only when I'm accelerating. It's most noticeable after a cold start. Does any one else have this problem? Or know what it is? Any help would be greatly appreciated.
Hey guys,
I'm new to this forum...
There could be a lot of things - but sounds like an exhaust shield to me.
That's common with a lot of cars, just go in and tighten all the bolts on the exhaust shield.
I'm new to this forum...
There could be a lot of things - but sounds like an exhaust shield to me.
That's common with a lot of cars, just go in and tighten all the bolts on the exhaust shield.
Rookie
Joined: Jun 2004
Posts: 99
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From: California
Good deduction
You might be right about that. It sounds like tinny metal rattling around.
I have a feeling that as soon as the metal reaches a higher heat, it ceases to ratlle. I've seen this kind of thing before in other instances... I'll try and tighten things, but it does make you wonder... If I find that its and exhaust shield, I was also thinking that I would try to put a crease in it to help give it some more ridgity, perhaps rattling less?
Anyone else have any ideas?
I have a feeling that as soon as the metal reaches a higher heat, it ceases to ratlle. I've seen this kind of thing before in other instances... I'll try and tighten things, but it does make you wonder... If I find that its and exhaust shield, I was also thinking that I would try to put a crease in it to help give it some more ridgity, perhaps rattling less?
Anyone else have any ideas?
Thread Starter
Driver School Candidate
Joined: May 2004
Posts: 29
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From: Washington
It might be the exhaust shield but for me the rattling noise only happens when the needle is just under 2k rpms and only when I'm accelerating. Once the needle falls below (if I take my foot off the gas) or rises above (as I continue to push the gas) the rattling stops.
Driver School Candidate
Joined: Sep 2004
Posts: 14
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From: Georgia
this morning I noticed the same thing, but it only happens when the engine is cold. After it started warming up no more ratteling. I was wondering if maybe it was something loose under the dash or a motor or tranny mount loose or going bad.
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is it coming from the front of ur car or rear.... i had noise from the rear and it was a loose heatshield.... but now i ahve a low rattle noise in the front of my car sounds like its coming from within the dashboard.
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Thread Starter
Driver School Candidate
Joined: May 2004
Posts: 29
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From: Washington
Mine sounds like it's coming from the front of the car. It seems like I'm hearing it through the air vents. If it is a loose heat shield then why is it that it's only happening in a specific range of rpms?
Pole Position
Joined: Dec 2001
Posts: 294
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From: ab
Air bubbles in coolent!!!!
If you recently had your car serviced, and if they changed the coolent there may be air bubbles. have that checked out, it should solve the problem.
Last edited by Navaz; Oct 7, 2004 at 09:37 AM.
Driver School Candidate
Joined: Oct 2004
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From: Massachusetts
cranking noise
hey i have a gs 400 and it does the thing i am a mechanic and i think it's the nox sensors there susposed 2 read what type of gas u use most of the time it means cheap gas but i use 93 and it still does it i put 94 in and it stopped a friend of mine has a 400 but he doent drive fast at all and his doesnt make that sound so just try and upgrade ur gas it might work
Originally posted by Jaricho
Mine sounds like it's coming from the front of the car. It seems like I'm hearing it through the air vents. If it is a loose heat shield then why is it that it's only happening in a specific range of rpms?
Mine sounds like it's coming from the front of the car. It seems like I'm hearing it through the air vents. If it is a loose heat shield then why is it that it's only happening in a specific range of rpms?
Trust me, its as simple as lifting your hood and tightening all your exhaust shield bolts. Usually 10mm bolts (for japanese cars) If its coming from under the body - ck the cat-shield... its a common thing and unless I can listen to it myself, I'd bet on that.
Originally posted by Navaz
If you recently had your car serviced, and if they changed the coolent there may be air bubbles. have that checked out, it should solve the problem.
If you recently had your car serviced, and if they changed the coolent there may be air bubbles. have that checked out, it should solve the problem.
Originally posted by wheelz00
hey i have a gs 400 and it does the thing i am a mechanic and i think it's the nox sensors there susposed 2 read what type of gas u use most of the time it means cheap gas but i use 93 and it still does it i put 94 in and it stopped a friend of mine has a 400 but he doent drive fast at all and his doesnt make that sound so just try and upgrade ur gas it might work
hey i have a gs 400 and it does the thing i am a mechanic and i think it's the nox sensors there susposed 2 read what type of gas u use most of the time it means cheap gas but i use 93 and it still does it i put 94 in and it stopped a friend of mine has a 400 but he doent drive fast at all and his doesnt make that sound so just try and upgrade ur gas it might work
What you're describing sounds like a KNOCK sensor. And they don't "read" what type of gas you use. They feel for unusual vibrations due to misfire,knock,etc. (thus the name, "knock sensor") Those can be caused by low octane - but again, doesn't relate to "rattling" noise.
Pole Position
Joined: Dec 2001
Posts: 294
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From: ab
The reson I said to check for bubbles in the coolent is almost everytime I get my coolent changed I get that same sound i first noticed it 5 years ago and since then the fix to the problem was to bleed the lines properly.
Lexus Champion
Joined: Nov 2001
Posts: 3,006
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From: New York (NY)
Originally posted by runyun
lol, this is the funniest. You're a mechanic? Then you should know there's no such thing as a NOX sensor? lol. NOX is a type of gas released from your exhaust. Check your inspection papers - you'll see NOX listed there. =)
What you're describing sounds like a KNOCK sensor. And they don't "read" what type of gas you use. They feel for unusual vibrations due to misfire,knock,etc. (thus the name, "knock sensor") Those can be caused by low octane - but again, doesn't relate to "rattling" noise.
lol, this is the funniest. You're a mechanic? Then you should know there's no such thing as a NOX sensor? lol. NOX is a type of gas released from your exhaust. Check your inspection papers - you'll see NOX listed there. =)
What you're describing sounds like a KNOCK sensor. And they don't "read" what type of gas you use. They feel for unusual vibrations due to misfire,knock,etc. (thus the name, "knock sensor") Those can be caused by low octane - but again, doesn't relate to "rattling" noise.
Please don't be quick to dismiss his opinion. These guys' "rattling" issue could seriously be engine knocks, especially if it was coming from the front.