IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

Cold start engine knock

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Old 07-24-17, 05:16 AM
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Mrfouche
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Default Cold start engine knock

This isn't the cold start engine rattle it is a knock.
When I start my car u get this knock in coming from the front of the car then it stops 5 to 10 mins it goes away.

What do I need to do because everything is fine after it runs for about 10 mins
Old 07-24-17, 08:20 PM
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MikeFig82
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Sticky lifters, or piston slap? How many miles do you have on the car?
Old 07-24-17, 08:37 PM
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Mrfouche
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from what i heard it could be a piston slap but it just sounds like knocks more than a slap and it only happens when it has been sitting for a while, such as overnight. then goes away after moving
Old 07-24-17, 09:03 PM
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MikeFig82
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Originally Posted by Mrfouche
from what i heard it could be a piston slap but it just sounds like knocks more than a slap and it only happens when it has been sitting for a while, such as overnight. then goes away after moving
Maybe a slight chance it has some carbon build up. Piston slap yes you would notice more on cold start ups.
Old 07-25-17, 03:10 AM
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Bichon
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A video would be helpful
Old 07-25-17, 03:25 AM
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ldc
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Wrong engine oil ?
Old 07-25-17, 07:02 AM
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Mrfouche
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Always use 5w-30 full synthetic. And when it does it again I will get a video
Old 07-26-17, 03:20 PM
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srt1
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I agree with others, slap, only because it goes away after warming. I have this on my escalade, which is very common. I was like WTF........oh it's a slap, gawd damnit! I make sure my oil is changed on time. For a V8, it was VERY loud and obvious. Is the sound loud or subtle? From my knowledge it is a pricey job unless covered by warranty. Yeah, when you get a vid post it and I am sure others will give you input.
Old 07-27-17, 05:28 PM
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2grfan
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Lots of motors piston slap to no detriment. Ive had several cars do it and is 2gr did it when really it cold this past winter.
Old 07-27-17, 09:32 PM
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bazzle01
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Does it only do it on slight accel?
Old 07-29-17, 09:55 AM
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Mrfouche
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Car sits idle and it hasn't done it in a little bit since I last posted.
Old 07-30-17, 05:14 PM
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Mrfouche
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It is a knock on acceleration. And does it while it is idling what can I do?
Old 07-30-17, 08:50 PM
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bazzle01
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IS350 or 250?
Maybe
1. piston slap
2. Bearing knock
3. Injector rattle (350)
4. PreIgnition
Old 07-31-17, 09:18 AM
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Mrfouche
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It's not a piston slap what is the bearing one sound like

Also it's a 250
Old 07-31-17, 03:43 PM
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Mrfouche
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The sound of the knock sounds like it's coming from the back of the car


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