02-02-2014, 12:06 PM
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#1
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Banned
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Join Date: Sep 2010
Location: Cupertino, CA
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Banned
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What is the most likely cause of cold engine squeal (see video)
What is the most likely cause of this cold engine squeal?
T oyota 4runner squeal when started on a cold engine - YouTube
The squeal only happens when the engine is cold, and only for about 30 seconds.
In the video, you can hear the squeal at startup, and then, halfway through the video, the squeal goes away.
Googling, I see it can be belts, pulleys, bearings, tensioners, power steering, etc.
I have a mechanics stethoscope on order.
Power steering fluid is not empty.
I'm not quite sure how to diagnose exactly which part is making the noise.
Since you guys know the 4Runner rather well, what would you suggest is the most common cause of this morning-only high-pitched squealing noise?
Last edited by mom; 02-02-2014 at 03:16 PM.
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02-02-2014, 12:24 PM
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#2
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Senior Member
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Join Date: Jul 2009
Location: West
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Senior Member
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Most common cause: the cold weather. My truck does this too on cold mornings.
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02-02-2014, 12:28 PM
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#3
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Elite Member
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Elite Member
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More than likely old belts. If they have never been changed, start there.
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02-02-2014, 12:35 PM
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#4
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Banned
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Join Date: Sep 2010
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Banned
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Quote:
Originally Posted by HOJeepster
Most common cause: the cold weather. My truck does this too on cold mornings.
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My fault.
I should have mentioned that I live in the Silicon Valley, where it hasn't been below about 50 or so during the day, and not even close to freezing all winter (except for one week early in December).
It happens EVERY time I start it (and has been doing so since early summer when it was 80 degrees outside).
Here is a video from a second start, after that video above:
1997 Toyota 4Runner squeal only when starting a cold engine - YouTube
Last edited by mom; 02-02-2014 at 03:17 PM.
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02-02-2014, 12:39 PM
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#5
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belt or power steering pump most likely. id replace the belt (cheap) and then if it doesnt stop check the power steering pump bearings
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1997 sr5 Mall crawler 3.4l 174,000
1993 sr5 3.sloooow 5 speed ome 2" rear coils slightly cranked torsion bars
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02-02-2014, 12:45 PM
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#6
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I have the same squeal on cold startups. and have narrowed it down to the alternator belt that needs to be tightened. I would check to see if your belts are nice and snug or if they need to be replaced.
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00' 4Runner Limited- Auto trans, E-locker, grey-wire mod, custom rock sliders, B&M 70268, TRD exhaust tip, 285/75/16 Duratracs
R.I.P 99' 4runna- auto trans, 4wd, tacoma whip mod,B&M 70768 tranny cooler, 265/75/16 Cooper Discoverer at3
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02-02-2014, 01:20 PM
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#7
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Depending in the condition of the belt it may be as simple as an adjustment to your belts. I find that most of the time we have cars with squeals in the shop it's the alternator belt that needs to be tightened.
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97' SR5 4X4- elbow delete, ISR, 40W DDM LED headlights, TB gasket mod, coolant bypassed, 14" BAMuffler, poly rack bushings, dirtydeeds custom rear tube bumper with poison spyder shackle mounts, King 2.5 coilovers, BFG AT KO 285/75/16, CBI ditch light brackets, HAZARDOUS LIGHT cubes, light bar, and LED interior lighting.
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02-02-2014, 01:32 PM
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#8
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Join Date: Jan 2011
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Elite Member
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How old are each of the three belts?
My V6 hasn't squeeled in years but my belts have less than 30k on them.
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Those he commands move only in command, Nothing in love. Now does he feel his title, Hang loose about him, like a giant’s robe, Upon a dwarfish treasonous thief.
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02-02-2014, 02:06 PM
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#9
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Join Date: Jan 2014
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Real Name: Dai
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Its most likely the belts. I think the rubber shrinks a little when its exposed to cold temps. like most things do and expands when they get hot. Nothing too extreme. Or check the tension on the belts.
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02-02-2014, 03:29 PM
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#10
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Banned
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Join Date: Sep 2010
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Banned
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Quote:
Originally Posted by BrianSD_42
How old are each of the three belts?.
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I don't remember when they were last replaced, so, it must be a few years, at least; so I'll replace the belts.
- This thread says BANDO is the OEM manufacturer.
- This thread says NSK is the OEM for pulley bearings
- This thread says there's a screen at the bottom of the power steering reservoir that gets clogged
This is the only 3rd-generation DIY I could find on the net, but, it's for the 3.4 L 5VZ-FE, while I have the 2.7L 3RZ-FE (but I also have the Haynes & FSM):
- How to: Change Drive Belts 3.4 L 5VZ-FE
EDIT: Found this for the 1st-generation 2.7L 3RZ-FE; do you think it would be similar (or the same) for the 3rd generation 3RZ-FE?
- 1st Gen How-To: Change your belts (P/S, A/C, Alternator) 2.4/2.7L
Last edited by mom; 02-02-2014 at 04:13 PM.
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02-02-2014, 03:46 PM
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#11
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It's the "O-L-D" law of squeaking belts, as my old man would say. Your belts are either o-l-d, or they're just c-o-l-d.
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02-02-2014, 03:47 PM
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#12
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Elite Member
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Join Date: Nov 2006
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Quote:
Originally Posted by mom
I don't remember when they were last replaced, so, it must be a few years, at least.
I googled squeaky belts, and some folks said to spray water on them to see if the noise goes away, as a diagnostic test.
Any other diagnostic tests to see if it's belts, bearings, power steering, or tensioners?
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I use the water test. You can always remove the belts one-by-one to narrow down the responsible system. Nothing bad happens running the engine briefly with all three aux. belts removed. If a bearing, you can usually feel something amiss turning/spinning it by hand once the belt is off.
If your belts are over 100k, I'd just replace them. At some point, there is no way to tighten an old, worn-out belt until it doesn't squeak. The stethoscope is good on bearings, too.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
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02-02-2014, 05:00 PM
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#13
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Banned
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Join Date: Sep 2010
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Banned
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Quote:
Originally Posted by TheDurk
If your belts are over 100k, I'd just replace them
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I don't mind replacing the three belts.
My local Autozone has Dayco and Duralast, but not Bando (which is the OEM brand).
- Dayco (PS = $10, Alt = $10, AC = $12)
- Duralast (PS = $17, Alt = $18, AC = $21)
I don't have any experience with drive belts; do you think the brand matters?
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02-02-2014, 06:54 PM
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#14
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Elite Member
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Elite Member
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Before you buy local auto zone I would highly suggest you call Camelback Toyota Online Parts and ask for an internet quote. Obviously it won't be cheaper than auto zone but it may come close enough to go OEM.
__________________
Those he commands move only in command, Nothing in love. Now does he feel his title, Hang loose about him, like a giant’s robe, Upon a dwarfish treasonous thief.
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02-02-2014, 08:10 PM
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#15
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Elite Member
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Elite Member
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Quote:
Originally Posted by mom
I don't mind replacing the three belts.
My local Autozone has Dayco and Duralast, but not Bando (which is the OEM brand).
- Dayco (PS = $10, Alt = $10, AC = $12)
- Duralast (PS = $17, Alt = $18, AC = $21)
I don't have any experience with drive belts; do you think the brand matters?
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I do. I got 120k on my factory belts without adjustment which is pretty awesome.
So, BANDO says you need this:
I'd go with Amazon:
http://www.amazon.com/Bando-4PK1120-...ywords=4pk1120
http://www.amazon.com/Bando-4PK915-Q...eywords=4pk915
http://www.amazon.com/Bando-5PK890-Q...eywords=5pk890
About $25 Prime eligible.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 02-02-2014 at 09:01 PM.
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