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Knocking on cold mornings

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Old 02-19-2009, 02:45 PM   #1
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Knocking on cold mornings

My 01 DC 4cyl prerunner has had a knocking sound for the past four years. It only happens when its been parked for 12+ hours, and the temperature hits 40 or lower. I've taken it to several toyota dealers and no one can seem to find anything wrong with it.
The harder you press the gas the faster and louder the knocking gets. Sometimes it goes away in seconds sometimes minutes.
The truck still preforms flawlessly but the sound is terrible.
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Old 02-19-2009, 03:49 PM   #2
With sufficient thrust, pigs fly just fine.
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Some have had this happen in the past. Many thing its "Piston slap", or the pistons not being completely tight angainst the cylynder walls because of the cold temp. From what I have read, there have been no issues of this causeing problems with engine longevity. As long as it goes away when the truck is warm, it shouldnt be an issue.
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Old 02-19-2009, 03:51 PM   #3
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i had the same thing with my 2000 it did go away when it warm up
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Old 02-19-2009, 04:17 PM   #4
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The knocking always goes away eventually its just that I DON'T want it to knock at all. It gets a little more noticable every year. I can't believe there isn't a solution.
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Old 02-19-2009, 04:19 PM   #5
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Well, it did it on my 2000 2.7 from 30,000 miles or so, until I sold it with over 100,000 miles. I saw the truck a while back, nothing has been done to it, and its close to 200,000 miles now.
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Old 02-19-2009, 07:15 PM   #6
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You could always pre-heat the engine with an oil pan heater or block heater, not sure if it get rid of the problem entirely but it might mitigate the problem. 40 degrees isn't all that cold either.
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Old 02-19-2009, 07:18 PM   #7
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Could also be worn timing chain guides
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Old 02-21-2009, 11:00 AM   #8
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Quote:
Originally Posted by TRD4x4858 View Post
Could also be worn timing chain guides
Ok now that gives me something to work with. Thanks man. I will give it a shot. Maybe thats the problem. Piston slap sounds like it too. How do you correct piston slap?
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Old 02-21-2009, 11:12 AM   #9
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Knocking on cold mornings

I have a 2002 4 cyl tacoma. my truck used to knock when i would first crank it up on cold mornings. i changed the oil to 10W 30 and it hasnt made the knocking noise since
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Old 02-21-2009, 12:27 PM   #10
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by clemsonfan4573 View Post
I have a 2002 4 cyl tacoma. my truck used to knock when i would first crank it up on cold mornings. i changed the oil to 10W 30 and it hasnt made the knocking noise since
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Good point. You may want to check a different oil. Mine quieted down a bit when I switched to 10w-30 Mobil 1.
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Old 02-21-2009, 12:29 PM   #11
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Its just piston slap. The reason why the noise goes away after a little while is because once the pistons warm up and exapand, there is no longer enough room for them to bounce and slap around enough for them to make the noise.
I wouldnt worry about it.
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Old 02-21-2009, 12:40 PM   #12
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Quote:
Originally Posted by Yotajoe01 View Post
Ok now that gives me something to work with. Thanks man. I will give it a shot. Maybe thats the problem. Piston slap sounds like it too. How do you correct piston slap?

Try some different kind of oil, like 10w30
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Old 02-21-2009, 03:49 PM   #13
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think maybe a lifter?
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Old 02-21-2009, 04:17 PM   #14
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by devilsalmostfree View Post
think maybe a lifter?
If it wasnt an overhead cam engine, it could be a lifter.
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Old 02-21-2009, 09:53 PM   #15
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Quote:
Originally Posted by TRD4x4858 View Post
Try some different kind of oil, like 10w30
Oil has nothing to do with it. If it were a rod knock or a lifter rattle, thicker oil might help, but thicker oil wont do a thing for piston slap.
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Old 02-22-2009, 07:51 AM   #16
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Quote:
Originally Posted by chris4x4 View Post
If it wasnt an overhead cam engine, it could be a lifter.
yep chris, ur right, i wasnt thinking about that part!
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Old 02-24-2009, 11:49 AM   #17
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10w 30 huh? all i can do is try. I'll give the mobile 1 a shot. I know its not really doing much damage because its gone on for so long. I just wish I didn't have to see the look on peoples faces when I crank it up and drive off.
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Old 02-24-2009, 05:43 PM   #18
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could it be ur timing chain slapping the cover?
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Old 02-26-2009, 10:42 AM   #19
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knocking on cold mornings

yea i know that feeling when everybody thinks your truck is messed up ha. i dont really know what causes it to knock like that. ive heard alot of different reasons but when i changed my oil in mine it doesnt knock anymore
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Old 02-26-2009, 11:20 AM   #20
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I live in michigan and there are times when it gets like -20 outside the truck always starts up right away never had a problem with starting in cold weather. It starts better then my dads 1/2 ton chevy hehe. As far as knocking I get it all the time when I first start my truck in the winter its just something it does when it is cold but it goes away in 1 min or less not much you can do about it but it does not hurt anything as long as you let it warm up a bit and give the oil some time to get to the top end
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