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Have a renault megane 2005 1.5dci and the engine is making a noise and its smoking

Just replaced the turbo and the clutch and now its still slugish and blowing smoke with the engine making a knocking noise

Posted by Anonymous on


6 Suggested Answers

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Posted on Jan 02, 2017

  • 97 Answers

SOURCE: engine

Hello Foffy69!

I'm afraid you are on the verge of a blown engine, from the description you have given. The loud knocking noise coming from down below is an indication of a spun rod bearing insert, and this is usually caused by either [1] running the engine with not enough oil in the crankcase to maintain necessary oil pressure, [2] a bad oil pump or problem in the pressurized oil system causing the same thing, no or low oil pressure, or [3]
over-revving of the engine, causing too high centrifugal forces on the crankshaft / connecting rod connection.

You need to check the oil level and make sure that is up to full level. Were there any dashboard indications of low oil pressure [oil pressure warning light / low pressure on gauge (if so equipped)]? If there were, you should have paid attention and done the above... if there were none, your oil pressure sensor might be bad.

This is a major repair and requires engine disassembly to the point of crankshaft removal and then have the crankshaft turned and micro-polished by a competent automotive machinist, replacement and clearancing of engine main and rod bearings, and possible replacement of the connecting rod with the spun insert or resizing of the rod and cap, and replacement of the main seals.

If the oil pump is functioning, you can take a temporary measure to keep your car driveable by doing an oil/filter change and refilling with the highest single weight viscosity oil available (at least SAE 50w) and substituting STP Oil Treatment or "Motor Honey" for one of the oil quarts. This should reduce, but not eliminate, the engine knock. Drive very conservatively and keep an eye on the oil pressure, and you might delay the inevitable thrown rod, but try and do the proper repair as soon as you are able. If you do throw a rod, your engine will likely no longer be repairable... You will be looking at a complete engine replacement!!!

Foffy69, there are other ways your problem may have come to be, but for the limited amount of information provided, I have presented the most likely scenarios... Sorry for the bad news, but if you take action now, you can keep it from getting worse.
Best of luck, and PLEASE don't forget to rate my help... this is my only reward for helping you!!! If you have other questions or comments, don't hesitate to post them, or you can reach me directly at


Posted on Jun 23, 2008

  • 1586 Answers

SOURCE: engine blowing thick smoke from exhaust

It's likely that the bad bearings and resultant oil seepage from the bad turbo caused oil to pool up in the intercooler piping (this is common). With a new turbo in there, you won't have further oil seepage, so the remainder of the oil in the piping should burn off. Over the next little while, you should see the amount of smoke coming out continue to diminish. If it does not, and is still smoking in a week or two, post back up on here and we'll take it from there.

Posted on Oct 16, 2008

  • 60 Answers

SOURCE: Blowing Black Smoke - Petrol engine

im afraid to say that yor piston rings are worn and will need a engine rebuild , you could try and put a thicker oil in 15w40 or 20w40 if you can source it . hope this helps

Posted on May 05, 2009

  • 16 Answers

SOURCE: Knocking noise Renault Megane 1998

this is a white box on the other side of the passangers dash board. lift up the bonnet and disconnect it. that will stop the noise but now your heaters will only get warm instead of hot. its some sort of flap to do with the heater matrix. realy anoying

Posted on Mar 04, 2010

  • 64 Answers

SOURCE: BMW 318ci 2003 Blue Smoke When Engine is Warm

you definitley seem to be getting oil in your combustiion chamber, pull your spark plugs and see if they are coverd in oil. if so your valve seals are bad, if not your piston rings are bad. As far as the kncking noise its hard to tell though a description, id have to hear it, but ill go out on a limb and say its in relation to the leak it could be a piston or valve knock. The garage heard the noise, ididnt so i hope i could help.

Posted on Apr 19, 2010

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