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Engine knock #4635906
01/15/18 04:55 PM
01/15/18 04:55 PM
Joined: Aug 2015
Posts: 428
Caribbean
Nissan101 Offline OP
Nissan101  Offline OP
Joined: Aug 2015
Posts: 428
Caribbean
Good day,
At idle there is no knocking, at high rpms there are none,
But say 4500 rpm there is a "knocking sound",
You all think engine the engine is bad, or am i lucky and its one of the pulley bearing?

And the knocking noise can only be heard for the split second as I let my food of the throttle.

Please tell me it could be a pulley. :-(
ONly recently this engine was installed and now this.
Oil was changed recently with a store brand 20w50.
I used valvoline maxlife before.

Last edited by Nissan101; 01/15/18 04:57 PM.

Nissan N16 -10w30
Nissan S13 -20w50

Royal Purple HPS smile
Re: Engine knock [Re: Nissan101] #4635920
01/15/18 05:08 PM
01/15/18 05:08 PM
Joined: Jun 2017
Posts: 541
DFW
JustN89 Online sleepy
JustN89  Online Sleepy
Joined: Jun 2017
Posts: 541
DFW
I believe you posted something earier about this, and there was a recommendation given that you change out the store brand oil with a brand you've successfully used before. Valvoline Maxlife or the Royal Purple in your signature would be fine. Use a filter that you've used before as well. That will either solve your problem or we can remove those variables from the equation and start looking at other possibilities.

Re: Engine knock [Re: Nissan101] #4635921
01/15/18 05:09 PM
01/15/18 05:09 PM
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,053
Lyndhurst NJ
Sometimes theres a loud rattling noise from worn spring tension belt tensioners in between shifts, as you let off the gas, but its hard to say without hearing it.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Engine knock [Re: JustN89] #4635922
01/15/18 05:10 PM
01/15/18 05:10 PM
Joined: Aug 2015
Posts: 428
Caribbean
Nissan101 Offline OP
Nissan101  Offline OP
Joined: Aug 2015
Posts: 428
Caribbean
Yes i posted before,
I will change out the oil and filter tomorrow. Hopefully this fixes it.
This is my main daily now as the other car got sold, and i have to pay for University. So money tight :-(


Nissan N16 -10w30
Nissan S13 -20w50

Royal Purple HPS smile
Re: Engine knock [Re: Nissan101] #4635923
01/15/18 05:13 PM
01/15/18 05:13 PM
Joined: Aug 2015
Posts: 428
Caribbean
Nissan101 Offline OP
Nissan101  Offline OP
Joined: Aug 2015
Posts: 428
Caribbean
But question for mechanically incline people
If my engine had a mechanical failure, wouldn't it be knocking 24/7?
and my car has full power and no smoke.


Nissan N16 -10w30
Nissan S13 -20w50

Royal Purple HPS smile
Re: Engine knock [Re: Nissan101] #4635938
01/15/18 05:38 PM
01/15/18 05:38 PM
Joined: Jan 2006
Posts: 1,023
Ruidoso, NM USA
ammolab Offline
ammolab  Offline
Joined: Jan 2006
Posts: 1,023
Ruidoso, NM USA
"Letting off the throttle" knock does not sound like serious internal engine problems. Maybe a vibration from a pulley, bad engine or transmission mount, loose exhaust component etc.


2009 Honda CR-V
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: Engine knock [Re: Nissan101] #4635940
01/15/18 05:44 PM
01/15/18 05:44 PM
Joined: Oct 2004
Posts: 7,955
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,955
Cincinnati, OH, USA
What happens if you hold the throttle steady, in neutral, at a fairly high RPM (3500-4000)-do you hear any knocking then? Is it better when cold (just warmed up) & only loud when the oil is hot? Usually when I have had loose/worn rod bearings they're a LOT worse with hot oil. If it has a bad rod bearing(s), 20W50 may not be thick enough!


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Engine knock [Re: Nissan101] #4635948
01/15/18 05:52 PM
01/15/18 05:52 PM
Joined: Jul 2005
Posts: 30,415
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,415
NY
It could be a lot of things, tough to diagnose w/o seeing and hearing it. I had a noise in an old Ford van once, it sounded just a like an engine knock. I disconnected all the fan belts and ran the engine briefly and there was no knock. Then one accessory pulley at a time starting with the water pump I moved the pulleys from side to side to check for play and spun them to check for odd noises. I found the air pump was knocking. Years later I had the same noise in my 88 E-150, it was the air pump again. It could be an accessory or damper pulley in your case.


God Bless Our Troops

Re: Engine knock [Re: demarpaint] #4635975
01/15/18 06:20 PM
01/15/18 06:20 PM
Joined: Aug 2015
Posts: 428
Caribbean
Nissan101 Offline OP
Nissan101  Offline OP
Joined: Aug 2015
Posts: 428
Caribbean
At max rpm (6200) no knocking,
only at the point of letting go of the throttle.


Nissan N16 -10w30
Nissan S13 -20w50

Royal Purple HPS smile
Re: Engine knock [Re: Nissan101] #4635978
01/15/18 06:20 PM
01/15/18 06:20 PM
Joined: Aug 2015
Posts: 428
Caribbean
Nissan101 Offline OP
Nissan101  Offline OP
Joined: Aug 2015
Posts: 428
Caribbean
Does not make a difference, it is the same when hot and cold


Nissan N16 -10w30
Nissan S13 -20w50

Royal Purple HPS smile
Re: Engine knock [Re: Nissan101] #4636089
01/15/18 08:13 PM
01/15/18 08:13 PM
Joined: Sep 2016
Posts: 513
Vienna, VA
TinyVoices Offline
TinyVoices  Offline
Joined: Sep 2016
Posts: 513
Vienna, VA
What motor in your s13? KA?


1993 Toyota MR2 Hardtop N/A - 160k miles - Valvoline Max Life 5w30
2006 Toyota Matrix XR AWD (Fiancee) - 130k miles - Valvoline Max Life 5w30
Re: Engine knock [Re: Nissan101] #4636193
01/15/18 10:05 PM
01/15/18 10:05 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
Take it to a mechanic, don't lose time asking strangers on the internet


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: Engine knock [Re: Nissan101] #4636259
01/16/18 12:26 AM
01/16/18 12:26 AM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Originally Posted By: Nissan101

And the knocking noise can only be heard for the split second as I let my food of the throttle.


It is a broken piston skirt.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Engine knock [Re: Linctex] #4636334
01/16/18 07:19 AM
01/16/18 07:19 AM
Joined: Sep 2007
Posts: 313
northern NY
Driz Offline
Driz  Offline
Joined: Sep 2007
Posts: 313
northern NY
You can get a decent mechanics stethoscope at Autozone for $8 and a really good one amazon foe $20. Get one , itíll open up a whole new world for you. Forget that long extension [censored] too. Once you have one you will use it again.
That will normally let you zero right in on where the noise is coming from by the process of elimination. As always while working on a running engine to tuck in long hair and long floppy clothes especially sleeves. Remember that fan comes on when it decides to so stay outa there always. Good luck

Re: Engine knock [Re: Nissan101] #4636336
01/16/18 07:24 AM
01/16/18 07:24 AM
Joined: Nov 2006
Posts: 19,888
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,888
MA, Mittelfranken.de
I cant even venture a guess but I would start by having someone operate the throttle while I listened under the hood to at least determine if it was an internal engine noise or external.
As you just put the engine in it could be a host of things from an exhaust hitting something, engine mount damage or a mounting bracket.


ASE L1, Master. Deutsch Meisterbrief.
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