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Auto Repair Diagnostic Strategies

Welcome to another diagnostic & general knowledge article for your auto repair insight. Emissions repair can be extremely "Exhausting". A good Technician is one that can diagnose a check engine light, considering that 90% of diagnosing a check engine light is emission related. In this article I will examine diagnostic strategies using 5-gas analysis.

Lambda, Combustion Efficiency, Carbon Gases, CAT Efficiency and EVAP Emissions:

-Lambda is perfect air fuel ratio 14.7 parts of air to 1 part of fuel. The closer you get to Lambda, the less carbon emissions. Lambda is a great diagnostic tool, more fuel and less air means rich condition, which will cause the CO and HC gases to be high. We will discuss carbon emissions further in the article.

-Combustion efficiency speaks for itself, the more efficient the combustion is, the cleaner the emissions gases are and the better the fuel mileage is. For checking combustion on your vehicle, consult an auto repair technician with the proper equipment. Carbon Gases pollute the earths atmosphere and can cause a number of Ozone problems including "Acid Rain". There are three very harmful gases; Carbon Monoxide, Hydrocarbons and Oxides of nitrogen.

-Carbon monoxide or (CO), this harmful gas will usually be out of range when there is a fuel problem and the vehicle is rich, considering it is a reading of unburned fuel or raw fuel escaping the tailpipe.

-Hydrocarbons or (HC), this gas is will be seen usually with an ignition problem. HC is read in parts per million or grams per mile. It is the reading of partially burned fuel escaping the tail pipe. Both of these carbon emission gases can be easily diagnosed, using the correct procedure and checks, including your Lambda Numbers.

-Oxides of Nitrogen or (NOX), A gas that has been known to cause acid rain. NOX basically boils down to Cylinder pressure or temperature. The more pressure or heat in the cylinder the higher the NOX will be. If a cylinder exceeds 2,500 degrees the vehicle will produces excessive NOX. This can be achieved in different ways including the exhaust gas recirculation or (EGR) system.

-Catalytic Converter or (CAT) efficiency, the catalytic converter is the most important emissions component on a vehicle with an internal combustion engine. The CAT cleans the carbon emissions to virtually zero when it is 100% efficient. Engineers have created an ozone preserving automotive part, which needs to be in excellent operating condition.         

-Evaporative Emissions or (EVAP) one of the most complicated emission repairs, if you do not have the training and equipment. EVAP emissions pollutes the Ozone 10 times more the vehicles tailpipe because to the CAT. Evaporative Emissions is actual fuel vapor that is creating carbon gases. Gasoline is a huge carcinogen, which means it causes cancer and is very harmful, be careful gassing up your ride. The invention of the catalytic converter has significantly reduced tailpipe emissions therefore EVAP emissions is now the major contributor to carbon gases. I have experienced many different problems concerning the EVAP system and have a great skill for Evaporative
system diagnosis.

Most importantly, find the proper auto repair facility to diagnose and repair harmful emissions failures. Not only will this preserve our Ozone, it will also save you money. The best way to locate a great auto mechanic is to look at their emissions work. If they are poor on diagnosing carbon emission failures and do not have a 5-gas analyzer, then they do not have the training and or equipment to diagnose a drive ability problem or check engine light. I have worked on cars all of my life and currently perform quality Auto Repair in Mesa AZ. In this article I have examined carbon emissions and 5-Gas analysis.

About the Author

My name is Mike Rux, I have been working on cars for years. Auto Repair is becoming very complicated. Working on cars these days takes the right equiptment and knowledge. I highly recommend you take your time and find a qualified auto technician for repairs.

Heat pump evaporator coil "leak"?

Just wondering if anyone had an oppinion. I have a heat pump system that leaked out all the freon. Technicians came and did a Nitrorgen test after separating the system into three sections and found that the evaporator coil leaked all the nitrogen out. Instead of helping with finding out where it was leaking he just left it at "You evaporator coil is leaking and you need to send it back to the company." Anyway, Itook it out and tested it with my air compressor, but could only get it up to about 75-100 psi, submerged it in water and found the connection from the line to the core wasn't tight enough. I tightened it and I cannot find any other signs of a leak. The technician came back and said that what I was doing was pointless because any PSI less that 300+ won't show if it's leaking or not. Would this 100 or so psi be enough for me to discover a leak or not? Will it leak at 300 psi and not 75, and if so, then why did the system drain all the way down? Please help.

His answer wasn't right. You only have high pressure up to the expansion valve. Once past where the small line hits the expansion valve it evaporates because the pressure is LOWER.

They don't call it the LOW side for nothing.

If it was the condenser, the HIGH side, that would be another matter. And refrigerant is a very small molecule. So for the most part pressure still wouldn't matter much except for the rate at which it leaks with a water test like you did since air is mainly nitrogen.

I too think it is worth a recharge.

Good Luck.

SANYO Twin Guard Series(TM) Is the First -86 C Ultralow Freezer in North America to Offer Dual Cool Technology
WOOD DALE, IL--(Marketwire - 03/10/10) - SANYO North America Corporation (SANYO) Biomedical and Environmental Solutions Division introduces the Twin Guard Series MDF-U500VXC, the first 18.3 cu.ft., -86C Ultralow Temperature Freezer to be offered and sold in North America with Dual Cool technology . Unlike traditional cascade systems, Dual Cool operates as two refrigeration systems with two ...

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