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Posted: 4/14/2024 10:33:26 AM EDT
[Last Edit: -SkyRaider-]
2009 Toyota Tacoma SR5 TRD Offroad with the 1GR-FE engine.
140,000 miles on the truck. At *exactly* 1800 RPM, I get a "rattlecan" noise. It sounds like it's originating from approximately the left center area of the engine bay. The sound happens when passing upward through 1800 RPM and downward through 1800 RPM. The engine must be moderately loaded for it to happen. It does not happen in neutral or under light load. |
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Posted: 4/14/2024 10:36:26 AM EDT
[#1]
My guess is timing chain tensioner is worn, so the chain is slapping at that rpm while under load
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Posted: 4/14/2024 10:42:54 AM EDT
[#2]
Quote HistoryOriginally Posted By fttam: My guess is timing chain tensioner is worn, so the chain is slapping at that rpm while under load Hmmm. Good (possible) call! Would something like that be difficult to check? What is the typical ultimate failure mode of a timing chain tensioner? Thanks. |
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WI, USA
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Posted: 4/14/2024 10:48:51 AM EDT
[#3]
This is, in my past experience, usually a slightly loose, slightly bent, or otherwise out of place heat shield.
That particular RPM is it's resonant frequency and it rattles. Finding it is harder than fixing it. Once you find where it is and what it's rattling against either bend it back so it doesn't rattle, or replace it. |
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Posted: 4/14/2024 10:57:00 AM EDT
[#4]
Honda V-tec?
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Posted: 4/14/2024 10:59:00 AM EDT
[#5]
Quote HistoryOriginally Posted By eclark53520: This is, in my past experience, usually a slightly loose, slightly bent, or otherwise out of place heat shield. That particular RPM is it's resonant frequency and it rattles. Finding it is harder than fixing it. Once you find where it is and what it's rattling against either bend it back so it doesn't rattle, or replace it. |
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Posted: 4/14/2024 11:01:36 AM EDT
[#6]
Resonance.
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Posted: 4/14/2024 11:28:34 AM EDT
[#7]
Originally Posted By eclark53520: This is, in my past experience, usually a slightly loose, slightly bent, or otherwise out of place heat shield. That particular RPM is it's resonant frequency and it rattles. Finding it is harder than fixing it. Once you find where it is and what it's rattling against either bend it back so it doesn't rattle, or replace it. Originally Posted By BillofRights: Resonance. This is where I would start, just start giving anything that looks like it could rattle a good smack and see if it rattles. |
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Posted: 4/14/2024 11:56:26 AM EDT
[#8]
Quote HistoryOriginally Posted By -SkyRaider-: Hmmm. Good (possible) call! Would something like that be difficult to check? What is the typical ultimate failure mode of a timing chain tensioner? Thanks. Quote HistoryOriginally Posted By -SkyRaider-: Originally Posted By fttam: My guess is timing chain tensioner is worn, so the chain is slapping at that rpm while under load Hmmm. Good (possible) call! Would something like that be difficult to check? What is the typical ultimate failure mode of a timing chain tensioner? Thanks. My F150 had all the pieces of one in the oil pan. The timing chain was sawing a hole in the cover. It still ran fine. I was lucky. |
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Posted: 4/14/2024 11:59:16 AM EDT
[#9]
I should have mentioned that the truck has 140,000 miles on it.
Is that on the low side for a timing chain issue? |
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Posted: 4/14/2024 12:01:59 PM EDT
[#10]
Quote HistoryOriginally Posted By -SkyRaider-: I should have mentioned that the truck has 140,000 miles on it. Is that on the low side for a timing chain issue? lol! Congratulations on 140,000 miles! |
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Posted: 4/14/2024 12:03:50 PM EDT
[#11]
Quote HistoryOriginally Posted By ske714: lol! Congratulations on 140,000 miles! That’s nothing for a Toyota. |
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Posted: 4/14/2024 12:09:25 PM EDT
[#12]
Another possibility is pinging or detonation. Try a tank of higher octane fuel through it and see if it makes any difference.
Not so funny story. I once had a rattle on the front of my 98 F-150 4.6L V8. All research indicated a bad timing chain, tensioners, etc. So I tore the front of the engine apart and changed them. Imagine my surprise when the noise continued. Turned out to be a bad bearing in the A/C compressor pully. |
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OR, USA
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Posted: 4/14/2024 12:16:18 PM EDT
[#13]
I've had timing belt tensioners do that. Could simply be a belt tensioner.
My car does something similar lower in RPM due to the SMF I installed which makes my transmission rattle due to no longer damping that frequency. |
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Posted: 4/14/2024 12:19:25 PM EDT
[#14]
Quote HistoryOriginally Posted By -SkyRaider-: That’s nothing for a Toyota. Quote HistoryOriginally Posted By -SkyRaider-: Originally Posted By ske714: lol! Congratulations on 140,000 miles! That’s nothing for a Toyota. Toyota parts wear out, the same as any others. They aren't magical. |
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Posted: 4/14/2024 12:22:00 PM EDT
[#15]
Try a tank of premium and a can of GOOD fuel system cleaner [techron] and see if the rattling goes away or reduces significantly. If it doesn't check loose components on exhaust system before going further.
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Posted: 4/14/2024 12:23:19 PM EDT
[#16]
Quote HistoryOriginally Posted By fxntime: Try a tank of premium and a can of GOOD fuel system cleaner [techron] and see if the rattling goes away or reduces significantly. If it doesn't check loose components on exhaust system before going further. Thanks. I run Costco 93 all the time. |
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Posted: 4/14/2024 1:50:58 PM EDT
[Last Edit: fxntime]
[#17]
Quote HistoryOriginally Posted By -SkyRaider-: Thanks. I run Costco 93 all the time. Quote HistoryOriginally Posted By -SkyRaider-: Originally Posted By fxntime: Try a tank of premium and a can of GOOD fuel system cleaner [techron] and see if the rattling goes away or reduces significantly. If it doesn't check loose components on exhaust system before going further. Thanks. I run Costco 93 all the time. Gotcha, likely the exhaust system is where I'd check next. The 4.0 isn't the quietest 6 banger out there anyways but it does have some knock with low octane issues. |
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Posted: 4/14/2024 1:57:22 PM EDT
[#18]
Quote HistoryOriginally Posted By fxntime: Gotcha, likely the exhaust system is where I'd check next. The 4.0 isn't the quietest 6 banger out there anyways but it does have some knock with low octane issues. Yes. I could never figure out why the 1GR has so many issues with knocking. I guess the stock timing is super-advanced. |
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Posted: 4/14/2024 7:53:00 PM EDT
[#19]
I'm also voting for exhaust shield. I've had it happen on several vehicles.
My truck, a 2006 Toyota Tundra would make a loud rattling sound when stopped and the transmission was in drive. It wouldn't when in park though. Worked on the exhaust shields a little bit and the sound went away. |
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Posted: 4/14/2024 8:19:35 PM EDT
[#20]
I had a noise I swore was a heat shield. Turns out it was the catalyst element banging around in the cat. Eventually it got turned sideways and corked the exhaust.
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Posted: 4/15/2024 10:29:50 PM EDT
[#21]
Quote HistoryOriginally Posted By -SkyRaider-: Hmmm. Good (possible) call! Would something like that be difficult to check? What is the typical ultimate failure mode of a timing chain tensioner? Thanks. Quote HistoryOriginally Posted By -SkyRaider-: Originally Posted By fttam: My guess is timing chain tensioner is worn, so the chain is slapping at that rpm while under load Hmmm. Good (possible) call! Would something like that be difficult to check? What is the typical ultimate failure mode of a timing chain tensioner? Thanks. Left center of the engine bay is where the chain tensioner is, I believe. This video covers how to eyeball your chain tensioner on a 4.0L  Does your Toyota have a stretched timing chain? | Toyota Tacoma - FJ Cruiser Timing Chain |
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Posted: 5/9/2024 9:19:37 PM EDT
[#22]
In order:
Does it do this only when cold and go away when the engine warms up? Heat shield somewhere. Something driven by the serpentine belt - tensioner bearing, idler, or something else. Timing system That being said, vvti systems are noisy especially when cold, but so are things driven by the serpentine belt. My Tundra 5.7 would not turn the water pump for a half second when started below 35 degrees. That squealing noise sure wakes you up in the morning. All other noises quieten down once the engine is halfway warmed up. |
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