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Knocking sound in engine when startin cold engine

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Sounds like car has been overheated and has a collapsed piston skirt. This will cause piston slap until piston heat up and expand. -------------------------------------------------------------------------------
fgtech

Posted on Nov 30, 2012

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SOURCE: knocking noice if van sits fro 4 days or longer

it may be a stuck lifter,.try some lucas oil..it may go away in couple of days ,it depends on how much you drive the veheicle..worked for me.GOOD LUCK..

Posted on Jan 09, 2010

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Engine got a knocking cold start, silint when hot


It has developed a clicking engine noise on a cold start. After the car has warmed up, the sound goes away. ... Clicking or a sharp tapping from the valve cover on top of the engine would point to a valve train noise. A dull tapping or slapping sound from the side of the engine block would point more toward piston slap.4 Nov 2011

Cold-start engine clicking is a nuisance, not a disaster - StarTribune.com


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Cold Night. Battery needed boost in morning. Now there is a loud knocking sound.


Once the car is running, the battery is more or less out of the picture. Knocking sound should not be the battery. There are all kinds of knocking sounds that can come from an engine, you need to provide more details or better yet, have the car towed to a mechanic.

Feb 16, 2015 | 2008 Jeep Liberty

1 Answer

My engine has a knocking sound


i'm sorry! does the engine dipstick for the oil,is it full? has it been run low on oil lately? is the knocking sound like a real hard knocking,thumping with like deep base sound?if so,do not start it again. you may have a bad crankshaft bearing,or a bad crank,broken crank. if it's a tapping sound,that's different. it could be low oil pressure, just like the lower knocking,it may be bad oil pump.my advice is this, lower knock from oil pan where you drain the oil,do not start! upper,on top of the engine,just change oil 1st add a fram oil filter,if in cold weather recommend 5w30weight oil,in summer,30weight castrol with fram oil filter.is your oil light on? if not,then it'not low on oil,but CHECK your oil on dipstick,just to be sure thank you for choosing fixya.com

Jan 28, 2011 | 2000 Ford Expedition

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2000 cougar makes loud noise in engine compartment when cold


does it sound like a knocking sound if it does check the oil it might be the valves knocking

Dec 05, 2010 | 2000 Mercury Cougar

1 Answer

Knocking noice if van sits fro 4 days or longer


it may be a stuck lifter,.try some lucas oil..it may go away in couple of days ,it depends on how much you drive the veheicle..worked for me.GOOD LUCK..

Jan 04, 2010 | 1999 Buick LeSabre

1 Answer

Engin makes knocking sound when i start it in cold weather


Try switching to a full synthetic oil, will flow better in cold weather and may stop the knocking.

Dec 31, 2009 | 2009 Jeep Wrangler

1 Answer

I have a 1994 Subaru Legacy and It has started making a "knocking sound". Cked the oil, it was OK


knocks when cold ( Start ), then sort of diminish or disappears when warming up ???

Knocking goes faster when accelerating when cold ???

If Yes, then Piston knocking on the wall of the cylinder . The sound disappears as the engine is getting warmer it dilates and the gap gets smaller.

If this just started,

1. Put quality oil & filter ( Mobile Full Synthetic Oil & Mobile Oil Filter or Purolator )

2. Do not put cleaning agents mixed with oil.

3. Personaly i've put "Restore" Engine Restorer & Lubricant in cars with more then 200 000 km and the results are amazing. But only "Restore". My Volvo is at close to 300 000 km, and it runs great. It's not a cleaning agent.

By experience if the knocking just started you can put an easy extra 100 000 km on the engine before a rebuilt. Quality Oil & let the engine warm up ( 3 mins ).


Nov 02, 2009 | 1997 Subaru Legacy

1 Answer

Knocking with cold motor


sounds like a weak oil pump id change oiland run some lucas with the engine oil

Oct 05, 2009 | 2005 Audi A3

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Knocking under valve cover on cold starts


Is there any smoke when you first start it? what is happening is the valve seals are probably worn and letting the oil seep past them. when your engine is first started it has no oil or very little oil at the top of the engine, thus causing the knocking noise. could be more but this is a most likely answer. oh and is you haven't changed your oil every 3,000 miles you had beeter start doing it.... answer knocking sounds usually come from bottom of engine try a better quality and correct viscosity oil

Nov 17, 2008 | Hyundai Motor 2002 Elantra

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