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Articles:

Porsche PCM Issues

Porsche Communication Management IssuesBy Tony Callas and Tom Prine The Porsche Communications Management (PCM) system encompasses all areas of your Porsche’s electronics operations that do not relate to the mechanical operation of the car. PCM would include the electronics for the audio, video, navigation and displays used in your car. For the purposes of this discussion we will focus on the 987-1 and the 997-1 which covers models years 2005 through 2008. Some owners have experienced problems with PCM equipment and they are surprised when we query about any possible changes to the car made prior to the onset of problems. Is your vehicle completely stock meaning there is no aftermarket electrical equipment, such as an IPOD interface, Satellite radio, Bluetooth component, etc… Almost any aftermarket component can cause issues with the MOST (Media Oriented Systems Transport) Fiber Optic Network architecture. The components or equipmen ... read more

Categories:

997

The Porsche M96 Engine and Cracked Cylinder Heads

The cylinder head(s) on any water cooled engine has the potential to crack, and Porsche’s M96 engine in the 986’s & 996’s is no exception. The most common reason for this to happen is when an engine significantly overheats, usually due to the loss of coolant. Overheating can be caused by something as simple as a faulty coolant hose, a cracked or broken radiator or coolant reservoir, or a water pump failure. If the driver is not periodically checking the instrument cluster, they might miss a warning light or a dramatic change in the reading on the temperature gauge (if your vehicle has a temperature gauge). When the coolant flow is lost, it doesn’t take much time for the engine to get really hot. When the engine overheats a great deal, the aluminum head material can actually distort in shape due to the combination of the extreme heat and pressure (or torque) being applied to the head by the fasteners that hold it in place. If the head material distorts, even a s ... read more

Categories:

986

Free Maintenance?

We are discovering that as new cars are coming off of their factory warranty and reaching the independent garages, they have been fairly neglected in the basic service areas. By basic service area we mean tire rotations, brake fluid changes and especially standard engine oil and filter changes. In an effort to look green and appear to produce an overall lower maintenance automobile, auto manufacturers are claiming their cars only need oil and filter changes every 10k miles, 15k miles, and even in some cases, 20k miles. Most auto manufacturers are now offering maintenance plans that appear to cover the costs of full maintenance but in all actuality do not. These skeleton maintenance plans only cover oil changes within their extended mileage guidelines. Extended mileage intervals are causing internal engine problems because engines are not receiving the critical oil and filter changes as often as needed. Many components inside the modern automobile engine are ... read more

Categories:

Maintenance

Porsche Computerized Engine Management

Porsche Computerized Engine Management

Porsche street cars first received computerized engine management for the 1980 model year. By today’s standards, the early version was elementary in comparison. This addition was obvious by the installation of an oxygen sensor to monitor oxygen content in the exhaust stream. This was Porsche’s approach to improve engine performance and tailpipe emissions in most operating conditions. In 1984 Porsche installed a full computerized engine management system named Digital Motor Electronics (DME) in the 911 Carrera. DME controlled not only the fuel injection but also the ignition system making it a complete package with one control unit for the entire engine management system. A basic description of the computerized engine management system is a control unit (computer), also known by some as the brain, which receives data from sensors on the engine that are monitoring its operation. These sensors monitor engine temperature, RPM or speed, throttle position, intake ... read more

Oxygen Sensors

The oxygen sensor was developed in the late 1960’s by the Robert Bosch Corporation. Porsche first installed an oxygen sensor, often referred to as an O2 sensor, in all their cars starting from 1980. The O2 sensor plays a critical role in the proper performance of the engine and helps support the effective operation of the emissions system. The O2 sensor is physically located in the engine’s exhaust system and monitors oxygen content in the exhaust gases exiting the engine. The O2 sensor operates by the principle of a chemical reaction that generates a voltage when oxygen in the exhaust gases comes in contact with the precious metals that comprise the O2 sensor. If little or no oxygen is present in the exhaust gases, a rich running condition exists and the voltage will build up higher in the O2 sensor. A lean running condition will have a lot of oxygen in the exhaust stream and this will generate a small amount of voltage. This voltage signal is sent to the Dig ... read more

The Importance of a Pre-Purchase Inspection

The Importance of a Pre-Purchase Inspection

Buying a used Porsche can be a difficult and even stressful task due to the potential for expensive repairs. Anyone contemplating a used Porsche purchase should consider that at a minimum, a few thousand dollars will be needed to bring things into top condition. Many believe that problems like a worn out clutch, or even engine and suspension issues are the worst and will set you back a lot of money–and they can. However, the worst case scenario is a twisted or diamond shaped chassis (body) caused by an accident. Often you cannot visually tell just by glancing at the exterior of the car. In this situation, the chassis will never be the same no matter how much time or expense is invested. The only way to lessen this risk is to send the prospective purchase for a PPI (Pre-Purchase Inspection) to a highly experienced Porsche repair facility. The chassis inspection should be top on the list, followed by the drive train, engine, gearbox, brake system, and finally ... read more

Porsche Software Repairs

In this modern day and age of computerized electronics, a software (Firmware) update is a commonly utilized repair, and your automobile is no exception. Porsche, like all automobile manufacturers, periodically reviews and refines the software operating parameters in their cars. This can be to optimize system performance however it is most often utilized to correct an operational anomaly. When an issue is identified that is non hardware related and affects a model line or a specific series of cars, the software is modified and is issued as an update. Whenever a software update is available for your car it is beneficial to get it installed, the car will operate better even if you cannot detect the difference. Updates are available to subscribing Independent Repair Shops either through the Porsche online network or can be installed with a factory genuine Porsche systems tester and software (PIWIS). There are times when the information or data carried by the CA ... read more

Porsche Engine Oil / Air Separators 101

Porsche Engine Oil / Air Separators 101

The Engine oil air separator directly affects the engine crankcase atmosphere because basically, all Porsche’s from 1980 on, including the current 986, 987, 996, 997, Cayman & Cayenne engines, all are positive crankcase type systems. This means that the engine crankcase has vacuum supplied from the intake manifold to collect and burn the residual combustion by-products or blow-by in the crankcase by running it through the engine again, all in an effort to lower the vehicle emissions. On most occasions when the oil separator fails, the low pressure (vacuum) in the engine crankcase rises to an unusually or abnormally high figure and, more likely than not, it ends up drawing engine oil into the intake system. This usually fouls spark plugs and, in rare cases, causes damage to the oxygen (O2) sensors, catalytic converters and possibly various other sensitive fuel injection components. In extreme cases an oil separator failure with excessively high vacuu ... read more

Categories:

Featured

Porsche Interior Pollen Microfilters

During my commute to work the other day I saw a person wearing a surgical style mask driving a newer Porsche. I assumed the mask was worn to prevent the spread of germs. My first thought was if the driver had any knowledge about the interior micro-filter or air recirculation system in their vehicle. The recirculation system and microfilter work as an integral part of the automobiles ventilation system which allows the operator to choose whether they want interior or exterior air supplied to the passenger compartment of their automobile. If the recirculation feature is chosen, this literally re-circulates the interior air back through the ventilation system and again into the passenger compartment, this also impedes the entry of particulate matter from the exterior of the car. If the recirculation feature is not chosen then exterior air will be supplied through the ventilation system and into the passenger compartment. The 1992 928 was the first P ... read more

Categories:

Maintenance

The Do It Yourself Oil Change (DIY)

Working on your own car can be an interesting and rewarding experience. Some people have a higher mechanical aptitude than others, but performing various basic repairs on your automobile can be mastered by anyone with an interest in doing so. We recommend that owners get more familiar with their car, even if it means changing a flat tire or just checking and setting the tire pressures — as long as the proper tools are utilized and correct procedures followed. For those who would like something more challenging, try performing your own engine oil and filter change. If you have never done this, ask your shop if you can observe their technician during an oil change and if they will explain why and what they are doing during every step of the process. The time and effort you pay to learn the proper procedure could pay big dividends towards your first oil and filter change experience. We recommend utilizing a factory or genuine engin ... read more

Categories:

Maintenance
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