Originally Posted by wmcdonaldd
Hi there, just to say thanks for the heads up on this problem. I'd had the same clatter for nearly 12 months on my 06 Columbia, Nissan did'nt want to know! But after reading this thread I went back for the third time and they've now fitted a new set of injectors - the silence is deafening!!!!!
The Cold Start Engine Clatter is Back again on Our Xtrail but this time Nissan Have agreed that there is a problem and are going to replace 3 more injectors , That's the 3 that were not replaced last year...................SO IF YOU HAVE THE SAME CLATTER TAKE IT BACK AND INSIST ON NEW INJECTORS.>>>>>> I THINK WE ARE WINNING!!
The denso injectors that Nissan use are crap and when cold tend to stick open, probably helped by the fact that the diesel we buy today has hardly any sulphur in it...This sticking open slightly causes over fueling. Nissan won't admit it as at £460 a piece as they now are they dont want to be replacing injectors on every noisy Xtrail, so they have taken the tack that just tell everyone that it's just a noisey engine, basically it's Diesel Knock Noise. I have a customer Service Bulletin in front of me right now and they give a load of bull saying """" As requirements for lower and lower emissions become more stringent then the fuel injector pattern has become more complex in order to ensure complete combustion of the diesel fuel. This means that the period of time between fuel being injected and the combustion taking place can be longer. One of the side effects of this is that the noise made during combustion has changed and therefore a knocking noise like "pinking" or pre ignition just like you would hear on a petrol engine may be heard after starting untill the engine has warmed up """ I have never read such crap, how can the noise during combustion have changed since the car was new and especially since the vehicle has not been back into the garage to have the pump settings altered, so nothing has changed except that the injectors are sticking open slightly and overfueling! that is the truth Mr NISSAN>>>> and you have replaced one injector in my Xtrail last year when it was 9 months old and you are about to change the other 3 as the OLD Injector Noise has come back to haunt me... Well it Haunted the guy at Nissan fore about a week untill I told him to cut out the bull **** and get another aftershave.......He said I'm the warranty Manager and all I want is a quiet life,, My reply was you'll get a quiet life when you stop messing about and authorise 3 more injectors for my car......I went in every day!! ....and 3 days later they have now ordered 3 more new injectors so if any of you have the same noise it's injectors and don't take all that crap about diesel engines being noisey, we know they are noisey but we also know that the injectors are at fault............................................. ..............................WHICH brings me on to something I read on another site>>>>>>>>>>I'm not going to go into it but you may like to read it!!
I have tried 2 Stroke in my old Golf Diesel and yes it does seem quieter! So I don's see why it shouldn't work in a more modern Diesel Engine.
to all interested: Read on!
due to the pollution control measures of the EC diesel-oil is nearly sulphur free and contains up to 5% of bio-diesel. Sulphur has the property to grease the high pressure injection pump and the injectors. Without sulphur, the reduced greasing property of the new diesel has already shown negativ impacts on the long-term stability of the injectors and the high pressure pump. The pump manufacturers have tried to react by lining the moving parts of the pumps with teflon or other suitable material. However, the long term stability is still not achieved as with the old (sulphor contained) diesel.
The engine-research centre of a well known German car manufacurer has conducted some long term tests of diesel additives to find out whether any one of them will have an impact on the long term reliability of the diesel engine components. This introduction to explain were my information comes from.
The results of this research: any diesel additive of any manufacturer presently on the market is not worth the money!
BUT: 2-stroke oil, which we use in our motor saws, lawn mower or in 2-stroke motor engines has shown to have an extreme positive impact on diesel engines, if such 2-stroke oil is added to the diesel in a homoeophatic dosis of 1:200. In practical terms: 0,300 litre of 2-stroke oil into the 70l diesel tank. The 2-stroke oil will be absorbed by the diesel (emulsion) and grease every moving part of the high pressure pump and the injectors.
Besides this, the 2-stroke oil will keep the diesel engine clean, as it burnes cleaner as the diesel itself.
In other words, the 2-stroke oil has a much lower ash-content as diesel, when burned. This proven fact delays the DPF (diesel particulate (soot) filter) to clogg, and the "burn free" process of the DPF will be much less.
One more information: in Germany we have to present our cars every 2 years to the TUV -Technical Supervision Organisation - who will check, amongs others, the pollution of petrol and diesel engines.
The measured cloud-factor of a diesel engine without use of 2-stroke oil has been 0,95.
The same factor with the use of 2-stroke oil has been 0,47 - reduction of nearly half of the soot particles.
Besides this, the use of 2-stroke oil in the diesel will increase the milage by 3-5%.
and more :-
You may all know that Mercedes Benz have conducted in 2007 a long distance reliability test with a number of Mercedes E-Class 320 cdi from Paris to Beijing. Due to the fact that the diesel quality in East European Countries, Russia and China does not meet the DIN requirements, and Mercedes did not want to take the risk of their engines to flopp due to lousy fuel, the total tour has been accompanied by diesel tanks to re-fuel the E-Class cdi's. Selected members of the Mercedes clientele could apply to participate in selected parts of this test-tour, and advocats and notaries had to certify the correctness of this long term reliability test.
Although Mercedes does not like it published or made public, it is a fact that the diesel-fuel used for this test did contain 2-stroke oil to grease the high pressure pump components and to keep the engines clean during this marathon.
Why our car manufacturers do not officially allow the homoeophatic addition of 2-stroke oil to the diesel fuel has many reasons, mostly of legal nature. Besides this, which car manufacturer has any interest in excessive reliability of their engines? Their repair shops will have great problems.
Meanwhile the "2-stroke-oil to diesel" issue has attracted the interest of a number of Universities in Germany, as this 2-stroke oil has shown to have amazing poperties if added in a small dosis to diesel fuel (1:200), especially the positive impact on air pollution, reduced fuel consumption and improved long term reliability of the diesel engine. The pro and con discussions will go on for a while. But as soon as an accademic report has been published by one of our Universities, this will change very fast.
By the way: all car manufacturers reject the addition of any fuel "additive" in their cars, and warn that guarantee MAY be affected. Nobody says, that guarantee WILL be rejected. 2-stroke oil in its properties is not an additive, as you add oil to oil if you "dope" you fuel with a dosis of 2-stroke oil. The dosis of 2-stroke oil in your diesel-fuel is very difficult to analyse, as every (chemical) analysis has the main function to identify substances which are harmful. But 2-stroke oil has proven not to be harmful at all, on the contrary!
Personally, I use 2-stroke oil now for many years in all of my diesel cars (my present business car is a Mercedes 320 cdi DPF Automatic). And I never had any problems whatsoever.