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02 SR5 Engine Knock

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Old 02-13-2012, 10:00 AM   #1
ButchL1947 [OP] ButchL1947 is offline
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02 SR5 Engine Knock

Just turned 116K and started hearing engine knock on cool mornings at low RPM's sound quickly ends upond short warm up - repair guy says "its a rod" and need to rebuild or replace engine - thoughts?
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Old 02-14-2012, 07:21 PM   #2
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I have an 01 and it does it when cold sounds awful. Some say piston slap others say carbon buildup. I have read IF it was under warranty they replace the short block. Mine has been doing it a while and I am getting rid of it this spring. Something is going to break at some point. I have 181,000 on my truck.
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Old 02-25-2012, 07:59 AM   #3
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I have a 2.7L 2000 tacoma and I noticed it knocking a couple of years ago on cold Colorado mornings. In the winter I started to use premium gas and I upgraded to Mobile 1 synthetic oil. That seems to really combat our issue!
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Old 03-07-2012, 07:20 AM   #4
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I have a 2001 that has had the knock you guys are talking about since about 85k it now has 203k with absolutely no issues. I say just give it time to warm up then.
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Old 03-07-2012, 07:29 AM   #5
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The knock is pre-igniton (aka detonation). It is the fuel burning before the piston reaches TDC causing the energy to be applied to the piston while it is still on the compression stroke.

There are several causes to this:
  • timing
  • carbon build up
  • bad or low octane gas

A quick fix is running the higher octane gas but that is only a band aid and does address the root cause. I'd suggest running seafoam in the tank a few times. and go from there.
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Old 03-07-2012, 12:07 PM   #6
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Quote:
Originally Posted by 98tacoma27 View Post
The knock is pre-igniton (aka detonation). It is the fuel burning before the piston reaches TDC causing the energy to be applied to the piston while it is still on the compression stroke.


There are several causes to this:
  • timing
  • carbon build up
  • bad or low octane gas
A quick fix is running the higher octane gas but that is only a band aid and does address the root cause. I'd suggest running seafoam in the tank a few times. and go from there.
Detonation during cold start? Seriously? I hear the same knocking on cold start if it's below 50*F... I have read around and the concensus is that the knock is a bit of piston slap due to looser tolerances in an engine that's worn-in and started cold. The sound can be annoying but in my truck it stops after 1-2 minutes and the engine always runs superb. I am not worried.
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Old 03-07-2012, 07:48 PM   #7
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I have the same noise and ticking. No worries
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Old 03-08-2012, 04:56 AM   #8
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Quote:
Originally Posted by 98tacoma27 View Post
The knock is pre-igniton (aka detonation). It is the fuel burning before the piston reaches TDC causing the energy to be applied to the piston while it is still on the compression stroke.

There are several causes to this:
  • timing
  • carbon build up
  • bad or low octane gas

A quick fix is running the higher octane gas but that is only a band aid and does address the root cause. I'd suggest running seafoam in the tank a few times. and go from there.
I have ran enough seafoam and high octane for everyone in here. I have ran the seafoam through the fuel and also induced through the intake. If anything it made my knock worse.
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Old 03-09-2012, 08:00 AM   #9
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Have the exact same thing. Mine started this Winter. 115k miles. Seems to do it when its under ~45F degrees. Now I always let it idle for about 20 or 30 seconds before I take off when its cold and then it runs like a champ. I'm not worried about it unless someone here has a reason to be.
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