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Hi All, Got the emissions test failed with high CO emissions at 2500RPM. Took the car to Mr Dhammika at Cotta road and analyzed the emissions. High CO situation happens after letting off gas from high RPM (2500 - 750). Not at sitting idle or at high rpms, only when coming to idle from high RPMs. His suggestion was to replace the MAF, which I was not so sure of. Anyways I failed again with another used MAF (returned and got my cash back). Then I bit the bullet and purchased a scanning software for my car and analyzed the readings myself. The O2 sensor reads high voltage when coming from 2500RPM to 750RPM. The thing is, even though the RPM drops to 2500RPM in a second, the O2 sensor voltage remains high (rich) for like 20 seconds. The short term fuel trim values shows the ECU is trying to lean the mixture by reducing fuel. This almost goes to -20 range and then only the O2 readings goes to lean and start switching between lean and rich. Please have a look at the below graphs and help me to identify the issue.. Engine Nissan QG16DE EFI.
Note by the moderator : This post contains information neither endorsed nor supported by the Autolanka community. Readers are advised to read the entire thread and form their own conclusions. Hi everyone This is my second post on the forum. I think this post will help a lot of people to reduce their fuel bill on petrol and diesel vehicles. Going forward we will have lot of vehicles but empty tanks. I have been doing some R&D on engine efficiency and cleaner exhaust gazes for some years and decided to do an engine modification on my Prado to get some extra power and a full burn. For non-technical members it is simply modifying the air intake of the engine at a safer place to feed in HHO as a gas instead of normal air we breathe which is not 100% accounting to a full burn inside the combustion chamber. HHO is a combustion rich gas but the generation mechanism should be done with absolute safety precautions out of water. Luckily I have a friend of mine who has a Garage (Unfortunately in Gampaha, which is a bit far away) and he was nice enough to listen to me (instead of ignoring me as if I have gone crazy) and comply with all the safety precautions and install the unit. Some pictures are attached for enthusiasts. Results: Increased fuel consumption by 20-25% (Mix of city and long distance). I refill a full tank earlier around 360KM range. Now it is 440-450KM range. Increase of power. I can feel it in the depth of low end torch in the Engine which keeps going. Reduced carbon emissions to a good as new engine. This is a 1999 Prado. Less vibration on engine Quick start when you crank the engine Everyone should not jump into this modification. It is a NO for vehicles with warranty by agents (Those brand new shiny vehicles are not lucky enough to have this because they will say “You have modified the engine and now we are not responsible!!!”) So save it for a later date. This is good for engines about 5-7 years and beyond. Vehicles of this age are having different relationships between the owners and the vehicle as such a bit of tweaking will not hurt any feelings J. There is absolutely no harm in doing this modification because it is done outside the whole system. Safety is first in this installation. Is this a real innovation which I should patent? Well absolutely no, because lot of people know about this but no one cares about the safety. Instead I though everyone interested should benefit from this because it helps going green and hugging trees a little. Regards Nana