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2.7L cold start rattle?

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Old 10-21-2012, 08:33 AM   #1
kim414may [OP] kim414may is offline
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2.7L cold start rattle?

Hi. I have a 2004 Tacoma Prerunner 2.7 L 3RZ engine rattle or clatter that happens first thing in the morning. This rattle gets longer with colder mornings. It started maybe last year and now I am reminded of it.

The truck has 150k and oil level is at full. I have been running synthetic valvoline and mobil 1 since day 1 with the truck.

It runs perfectly fine. Just this weird unusual rattle that goes away once it warms up. I have seen other and older posts relating to a possible piston slap? Others have also said this is normal for this engine. And my dad listened to it and said it is in need of a valve job.

Any suggestions or ideas? Thanks.

http://www.youtube.com/watch?v=cQpH0GIcTgg
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Old 10-21-2012, 01:17 PM   #2
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Not trying to be a clown,but you say your running synthetic oil.......what grade though?.....0w-20,5w-30 or what?. I am not a mechanic,but some vehicles are quite particular about oil grades.
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Old 10-22-2012, 09:41 AM   #3
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5w30. I live in San Diego relatively mild weather in my opinion.
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Old 10-22-2012, 01:25 PM   #4
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That noise is DEFINITELY not normal. It is hard to tell with the other background engine noises on a video though.

One way to check location is with a mechanical stethescope. They are relatively inexpensive and are worth their weight in gold when trying to track down noises.
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Old 10-23-2012, 05:46 PM   #5
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Something you can try is to turn on the air cond. during this sound and see if the rattle stops. Thinking of the electric clutch rattling on the air cond. compressor. If the rattle stops immediately, the electric clutch is your culprit. If the rattle continues then you can omit the air cond. clutch as a culpret.
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Old 10-23-2012, 06:32 PM   #6
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Def not the particular Toyota tick, would get this checked out. Mine makes a low tapping sound on cold mornings but goes away as soon as its warmed up. Yours sounds like a rod knocking, but I doubt that's what it is. If it was a rod knock it would be doing it all the time regardless of engine temp.
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Old 10-23-2012, 07:47 PM   #7
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Sounds like some good old piston slap to me. Typical on GM's. Normal for most vehicles.
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Old 10-23-2012, 10:26 PM   #8
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mines has a similar sound, I have a 2012 with 5k miles and I always have a rattle during cold starts cept mines seems to be coming from the muffler area. took it to the dealership and they had no idea what the problem is so they put some insulation or something on the spare tire chain to see if that helps from eliminating the rattle and it still rattles on cold starts in the morning.
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Old 10-24-2012, 01:54 PM   #9
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You've had it since day one -- how long has it been making this noise? Has it always made this noise but it's just getting louder now so you are becoming concerned? Anyway I agree it's probably piston slap... nothing to worry about, just don't rev the motor too high until it gets mostly warmed up. High revs are not good for cold engines.
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Old 10-24-2012, 02:59 PM   #10
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You definitely have something going on however it sounds too much like "tin" instead of a solid rod knock or piston slap. Try to rule out the AC clutch and exhaust pipe vibration. If you are using 05/30 oil try 00/30 see if that helps. You're not in really cold weather so perhaps something as simple as oil might help. Please let us know how this turns out, I'm interested as I have a 2.7L also although I'm just getting broke in at 44K miles.
Bill
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Old 10-24-2012, 11:22 PM   #11
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thanks

Thank all of you guys for your suggestions.

But yes I have had this truck since day one and it never made this sound. I heard it first around last winter maybe January-February but did not think much of it since it goes away. And as the winter turned to spring then summer, the cold mornings were not as cold so that rattling noise does not happen. But now that it is getting colder again and the truck's mileage is getting higher, I am getting concerned. To top that off was my discovery of TacomaWorld so here I am asking for input.

It gets frustrating though. I'm not mechanic savy but I have some experience doing simple repairs which I learned during my roommate situation. All I know is that if it's a warm or mild morning, this rattling doesn't happen. If it's a damn cold morning where you feel like you fingers are going to fall off, the rattling happens. I also live in a condo complex with no garage so extensive mechanical work is out of the question otherwise I can get fined ($100-200) if caught.

I will plan on leaving this car overnight on a cold night at the mechanics (a close relationship since this mechanic's parents are good friends with my boss's parents and I have a good relationship with my boss) and bring the suggestions listed here to see if that helps to point him in the right direction. Because once the truck becomes warm, the rattling stops and we would have to wait again for another cold morning.

I am going to update it I find out anything. This prerunner has been a gem taking my family and I up and down the states so I definitely plan on getting it taken care of ASAP. Just waiting for the truck's next service and saving up some cash.
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Old 11-02-2012, 11:34 PM   #12
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This is the same exact sound my 04 3rz doublecab makes. It's very frustrating trying to pinpoint where the noise is coming from. My truck has 127k miles. Although my happens when I put it in reverse and drive. I have to warm it up too for at least 1 min. Let me know after your mechanic finds out the culprit.
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Old 11-17-2012, 03:10 PM   #13
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Engine knock

Quote:
Originally Posted by kim414may View Post
Hi. I have a 2004 Tacoma Prerunner 2.7 L 3RZ engine rattle or clatter that happens first thing in the morning. This rattle gets longer with colder mornings. It started maybe last year and now I am reminded of it.

The truck has 150k and oil level is at full. I have been running synthetic valvoline and mobil 1 since day 1 with the truck.

It runs perfectly fine. Just this weird unusual rattle that goes away once it warms up. I have seen other and older posts relating to a possible piston slap? Others have also said this is normal for this engine. And my dad listened to it and said it is in need of a valve job.

Any suggestions or ideas? Thanks.

http://www.youtube.com/watch?v=cQpH0GIcTgg
Same deal here, if it's not a major mech. thing, try Amsoil 0w-30. Mobile 1 is a group III and not really synthetic. Amsoil is a group IV and far superior to Exxon etc.
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Old 11-17-2012, 04:14 PM   #14
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What oil filter are you using. Make sure the filter you are using has a silicon anti-drainback valve. If unsure try a purolator pure one in the correct size.
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Old 11-17-2012, 05:20 PM   #15
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Quote:
Originally Posted by Paulie View Post
Same deal here, if it's not a major mech. thing, try Amsoil 0w-30. Mobile 1 is a group III and not really synthetic. Amsoil is a group IV and far superior to Exxon etc.
Amsoil uses Mobil-1 base stocks.

Their additive package is different, but the base oils are identical.

Pretty much all automotive synthetics have been Group-3 blends ever since Mobil lost the Castrol lawsuit. The only fully group-4 synthetics still offered by Mobil or Amsoil are their motorcycle blends.
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Old 11-17-2012, 05:22 PM   #16
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Quote:
Originally Posted by 91r100gs View Post
What oil filter are you using. Make sure the filter you are using has a silicon anti-drainback valve. If unsure try a purolator pure one in the correct size.
The drainback valve doesn't matter on the inverted filter on the 2nd Gen 2.7... not sure the orientation of the 1st Gen 2.7.
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Old 11-17-2012, 07:22 PM   #17
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He does not have a 2nd gen. his is a 2004 and may be different. Never seen a 1st gen
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Old 11-20-2012, 03:17 PM   #18
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The 2.7 1st gen is a inlet/outlet up filter, and does not require any type of drain-back prevention.
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Old 11-28-2012, 07:45 AM   #19
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Wish I would of seen this sooner mine does the same thing 01-2.7 200K on it now. But mine even did it during the spring when leaving work it wouldn't rattle on start up but on acceleration from parking spot it would. I could let up on it and it would stop, push gas down again and it would knock. But this would stop within 2 city blocks.
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Old 11-18-2013, 01:22 PM   #20
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Any word on what the problem was? I have an 03 tacoma 2.7L with the same exact noise on cold days.
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