Question about 2002 Mitsubishi Lancer

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Nocking when cold then goes away (Proton coupe )

Hi iv got a 1.8 16v proton coupe and just lately it started to make nocking noises when i start car but once it has wormed up the nocking stops. its had an oil change not that long ago and also had a new radiator but need new thermostate could this be why? or could it be the oil pressure switch faleing? plus iv noticed there is a small crack in rocker cover ?

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It sounds like you may have some sludge in your oil. When the engine is cold the oil is thicker and takes a while for the oil pump to pump it through the engine. The next time you change the oil. Do an engine oil flush first to clean the inside of the engine and ports. If this does not work you might have to have the oil pump checked. There is no need to worry as long as you have oil pressure and the knocking stops. I hope this helps. Don't forget to rate this answer.

Posted on Feb 07, 2009

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Thermostat has nothing to do with the nocking, and neither does oil pressure switch. You said noise goes away when it warms up. So i don't suspect oil pressure problem. But i would be checking the crack in rocker cover, something put that crack in it and i suspect one of your rockers maybe loose enought and hit it and cracked it hense nocking noise. Its cracked, it needs to come off anyway then you can check rockers to see if one or more are loose, and if it hit the rocker cover and put a crack in it.

Posted on Feb 07, 2009

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Nocking when cold


Hi

Get a can of STP in there quick, and have your oil pressure tested with a master pressure gage, from cold this will tell you if you have a problem.

Good Luck !

A FixYa rating would be appreciated thanks !!

John.

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