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1.8 Engine, 159 K miles. Engine has mild knock

1.8 Engine, 159 K miles. Engine has mild knock when cold and under load. After it warms up it is ok. Worrys me. The engine does leak oil in various places. Using 10-30W oil. This time I put Risoline additive in it. Wonder what the knock is.

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How can I troubleshoot/resolve engine knock?


Sorry but you have a bad piston rod bearing or main bearing ! You won't have any indicators lit on the dash as this is a engine mechanical fault ! EGR - Knock sensor has nothing to do with this ! Take it to a shop an they will tell you the same thing .

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Sounds like a diesel on a cold day


could be a knock sensor or rockers knocking until oil warms up and oil pressure seals the lifters

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I have a Honda Accord 2004 with a code PO339, PO113 &PO344. can you assist in advice to solve these problems


p0339 is crank shaft position sensor related error. you need to be sure that its wiring is not damaged and it is not shorted somehow. if it is broken or getting broken, car may stall, or wont start att all.

p0113 is for intake air tempoerature sensor errors. that sensor measures air ehich enters the engine. it is least important. its effect may not be noticable when weather is not extremely cold.

p0334 is for knock sensor on engine. it prevent predetonation due to ignition conditions appear. it is felt when engine is under load like climbing, and engine speed is low. check for wires if it is ok replace sensor.

we can tell that temperature sensor is not directly effects other sensors.
but knock sensor and crank position sensor is to important for engine. if you have no starting issues, even cold or warm engine, invest on knock sensor first.

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2000 Nissan Sentra 1.8L. High mileage (330,000 plus miles). May take 5min or longer to start cold- acts like it's not firing one or more cylinders. Once it starts there's a big cloud like it was flooded....


Sounds like either it has a bad valve, or worn rings. With the mileage, I would suspect it's just plain getting worn out, when the engine warms up it internal tolerances are better then cold.

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Engine knocks at cold startup. knocks more under load. lasts about 5 minutes till warm. Dealer said: 1. " They all do that. 2. Piston Slap, don't worry. 3. Valve train slow to warm up in this...


I bought my wife a Lex and she also experienced the SAME problem. It is TRUE that that's one of the engine's characteristc's,but it can be corrected. These are the step's that i took.

(1) First step is to change the oil and filter if you HAVE NOT done so lately. (Get a GOOD filter(Fram or Puralator) and oil ( I use ONLY Castrol).

(2) Get a 12oz bottle of Sea Foam(insist on ONLY Sea Foam,because auto part's store's will try to sell you what's on sale. I KNOW that Sea Foam work's). Pour HALF of the bottle in your oil and the other half in the gas tank(Make sure that you have atleast a half of a tank of gas BEFORE you pour in the Sea Foam). The Sea foam will clean your engine internally to promote better oil flow,especially at cold start up when ou need it the most. When added to gas it act's as an upper engine cleaner to get rid of carbon build up in your Intake and EGR Valve which can cause the symtom's that you describe.

(3) Protect your internal engine part's during cold start wam up's by pouring in a bottle of Slick 50 AFTER you do the recommended oil change.

(4) Lastly, use NOTHING but 93 octane gas in you vehicle.

If you do ALL of these step's, you should notice the difference.

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1 Answer

1999 ford taurus se 155thousand miles, 3.0 V6


sounds like your thermostat is stuck open, if its takes a very long time for the engine to warm up and you get nothing but cold air from your heat then thats the first place i would start.

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Check all braces under your car. Not just visually, put hands on each and every brace. Sounds like one might be loose or broken. Hope it's as easy a fix as mine was.

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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 ).


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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

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