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Random starting noise HELP

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Old 12-21-2011, 05:59 AM   #1
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Random starting noise HELP

ok its starting to get cold and i noticed that if my truck sits over night when the weather gets cold that when I start it it rattles, but when it warms up it stops instantly. Is this normal? Have any of you seen this happen before?
Because in all honesty it scared the hell out of me when I started hearing it
hope yall can help me with this one
AJ
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Old 12-21-2011, 06:06 AM   #2
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What exactly is rattling?
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Old 12-21-2011, 06:15 AM   #3
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i dont know exactly it sounds like something under hood but im not exactly sure
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Old 12-21-2011, 06:16 AM   #4
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This is only happening with a cold motor?

This is only happening when being cranked?
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Old 12-21-2011, 06:22 AM   #5
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cold motor after it is started, while it is warming up in the morning, but whenit warms up its stops
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Old 12-21-2011, 06:25 AM   #6
:POOPCORN:
98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed
 
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Hmm, I'd look at the exhaust shrouds, cooling shrouds, etc. You might have to try and move them before you start it up. Then start it up with the hood open and see if you can see what is rattling
.
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Old 12-21-2011, 06:31 AM   #7
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now my Papaw worked at toyota for 20 somethin years and he sad that it could be something called a knock sensor. Meaning that it does that just to pretty much warn you not to drive it until it warms up but idk if thats what it is because ive never heard of that
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Old 12-21-2011, 06:38 AM   #8
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98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by Prerunner2511 View Post
now my Papaw worked at toyota for 20 somethin years and he sad that it could be something called a knock sensor. Meaning that it does that just to pretty much warn you not to drive it until it warms up but idk if thats what it is because ive never heard of that
LMAO, yes they have knock sensors but that's not what they are for or what they do.

Knock = detonation = pre-ignition. The sensor(s) tell the ECU if the timing needs adjusted.
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Old 12-21-2011, 06:44 AM   #9
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yea i knew about those lol and he did too but he said this was different lol. thats what i thought he was talking about to when he mentioned it !
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