The Mégane II Owners' Club

gavnaysh wrote:how true is the statement 53 or later is ok ive just bought a 53 plate collecting saturday didnt know ote about the turbo problems??? anything else to look out for??

hi iam new to this, just need some help with my car its a renault meganne 19dci 04 and theres aloud sucking noise under the bonnet - lack of power

could be a split turbo pipe / damaged intercooler etc

vilguy wrote:could be a split turbo pipe / damaged intercooler etc

hi many thanks, it all started when i broke down with a dud battery.RAC jumped me so icould buy a new, any way after fitting new this started. Could it be a dodgey sensor, taking it to Renault tomorrow. ps checked pipes cant see anything however the sucking noise is at the front next to engine air intake. Just fitted new air filter as the other was solid but dont think this is prob?

The intercooler can be split. In the early models it was prone to go banana-shaped. It is likely to be caused by the turbo actuator stuck in the max boost position, which is a precursor to the turbocharger failure. If you have to drive the car, keep the revs under 2000rpm.

When the engine is cold, check if the turbo actuator can be moved freely by hand. If not, then remove the turbo and clean the hot half inside.

AlexB wrote:The intercooler can be split. In the early models it was prone to go banana-shaped. It is likely to be caused by the turbo actuator stuck in the max boost position, which is a precursor to the turbocharger failure. If you have to drive the car, keep the revs under 2000rpm.

When the engine is cold, check if the turbo actuator can be moved freely by hand. If not, then remove the turbo and clean the hot half inside.

The acuator moves up and down, springs back down quite hard.

This is good. Then just locate the air leak an stop it. There might be a split pipe or the intercooler. It is also possible that something became loose. Escaping air carries oil spray, so hunt for oil spots. The front bumper might need to be removed, which is easy.

AlexB wrote:This is good. Then just locate the air leak an stop it. There might be a split pipe or the intercooler. It is also possible that something became loose. Escaping air carries oil spray, so hunt for oil spots. The front bumper might need to be removed, which is easy.

many thanks, would all this cause flat spots and white smoke?

Yes, white smoke is unburned diesel coming out because of the lack of air inside the chamber, the turbo is not doing his job currectly, the lack of power is a consequence of this problem. Once you solve the turbo issue the air needed for the correct combustion youll have your "power" again

cheers

tomalamix wrote:Yes, white smoke is unburned diesel coming out because of the lack of air inside the chamber, the turbo is not doing his job currectly, the lack of power is a consequence of this problem. Once you solve the turbo issue the air needed for the correct combustion youll have your "power" again

cheers

many thanks to all, it appears to be my intercooler. 300 pounds to get it replaced at Renualt, did not think this is bad by the time you add up all parts required plus time. My car goes in on Friday, it will take them approx 1 hour 30 mins.

taz wrote:many thanks to all, it appears to be my intercooler. 300 pounds to get it replaced at Renualt, did not think this is bad by the time you add up all parts required plus time. My car goes in on Friday, it will take them approx 1 hour 30 mins.

Hold on a second sir! The bumper can be removed in 10 minutes. It takes 2 minutes to remove the aluminium cross piece front internal bumper (1 bolt either side), around 30 seconds to loosen the jubilee clips to the intercooler and then it lifts off - literally. Allow the same length of time for reassembly. I would get a price for the part, and buy a copy of the Haynes manual for £20 or follow the online manuals on this site. Probably save yourself £150+ and learn a bit too (or get a local garage to swap it). While your doing the job you can check the hoses for oil which is an excellent way of checking whether the turbo is knackered or not. You only need basic tools - a screwdriver and a couple of hex sockets.

Have to interfere, sorry. The smoke due to low/absent boost is black. This is because low boost means rich mixture. White smoke is caused by coolant/fuel/oil (pick your favourite) evaporating in the exhaust. Yes, it can be due to the intercooler being flooded with oil, which can be caused by the leaking turbo, which can leak due to gummed up oil separator in the crankcase ventilation system. The latter also causes the turbo to leak oil from its hot side directly into the exhaust.

The EGR valve is also likely to be very sooty and so are the channels leading from its seat into the intake. It does not cause white smoke, but need to be cleaned anyway.

tomalamix wrote:Yes, white smoke is unburned diesel coming out because of the lack of air inside the chamber, the turbo is not doing his job currectly, the lack of power is a consequence of this problem. Once you solve the turbo issue the air needed for the correct combustion youll have your "power" again

cheers

Well, the intercooler will not solve your problem because the intercooler doesnt produce any smoke at all, its a completely static device, air goes in and air goes out, nothing else, except something besides air enters inside the intercooler, then its air and something else going in and air and something else going out. The only thing that could be wrong with the intercooler is a broken intercooler. If that's not the case you're going to be robbed by the dealer and the source of the problem will not be solved.

If the turbo is also failing probably you will have oil going to the chamber also and again the intercooler is not the problem. By the way, when you solve the problem that its somewhere else, not the intercooler if its not broken, you can clean it, just do like dave said, take it out, put a good oil solvent inside during the night and in the morning wash it up and place it again, you can use water to clean it. It's not common to have broken intercoolers except if they hit something or have some factory defect.

Cheers

tomalamix wrote:Well, the intercooler will not solve your problem because the intercooler doesnt produce any smoke at all, its a completely static device, air goes in and air goes out, nothing else, except something besides air enters inside the intercooler, then its air and something else going in and air and something else going out. The only thing that could be wrong with the intercooler is a broken intercooler. If that's not the case you're going to be robbed by the dealer and the source of the problem will not be solved.

If the turbo is also failing probably you will have oil going to the chamber also and again the intercooler is not the problem. By the way, when you solve the problem that its somewhere else, not the intercooler if its not broken, you can clean it, just do like dave said, take it out, put a good oil solvent inside during the night and in the morning wash it up and place it again, you can use water to clean it. It's not common to have broken intercoolers except if they hit something or have some factory defect.

Cheers

my intercooler has a hole in it, plus getting a free oil change. turbo still working as i can still feel it kicking in but as lose of air through cooler it dies.

Hy there,

Well, if you have an hole on the IC you will have lack of power and a rich moisture, that explains the symptoms. Did you changed the IC already?

Cheers

tomalamix wrote:Hy there,

Well, if you have an hole on the IC you will have lack of power and a rich moisture, that explains the symptoms. Did you changed the IC already?

Cheers

Had new intercooler fitted, now runs sweet as a nut. again many thanks to all for your help. ps Evans halshaw was really good to deal with.