What You Must Know Before Buying A Used 911 Carrera 997
If your just taking the initial steps to buying a Porsche 911 Carrera 997, this guide will highlight some of the technical issues to be aware of before you commit to buy.
The 911 Carrera 997 was launched more than 15 yeas ago and the early 997 cars are now extremely affordable. The car is fun and exhilarating to drive yet, can be used every day. After the success and issues with the 996 versions of the 911, Porsche launched the 997 revised versions in 2005. While the 996 was a little more raw, the new 997 was more sophisticated, well behaved and easier to drive.
During production, which ran until 2013, Porsche produced a number of derivatives that included the Carrera Coupe, S, Targa, Turbo, Cabriolet, 4wd and GT versions. The most significant update came in 2009 with the launch of the 997.2 version.
The 997.2 made some significant departures from the original 997 including a new direct fuel injected engine (9A1) a dual clutch PDK transmission, revised suspension and the all important from bumper with LED lights!
The Turbo and GT cars continued to be powered by different engines from the Carrera versions. The original 997 featured an M97 style engine that addressed some of the problems from the previous version. The DFI engine in the newer 997.2 further corrected the problems from the original engines and completely eliminated the famed IMS style design.
997 in the Sweet Spot
The first-generation 911 997 Carrera is now close to 15 years old. The good news is that the majority of the car is generally reliable and has a near timeless look. With the launch of a new 911 platform, prices for the 997 have been driven lower. This is a super value for money, everyday super car.
The first step, once you’ve identified a 997 candidate, is to get a thorough inspection by a local expert. The pre-purchase inspection is designed to identify mechanical problems that may not be clearly evident at first glance. In our buyer guide below we’ve extensively highlighted those potential issues to be on the look out for. Getting a repair history on the car, if available, is helpful and will instantly identify or eliminate potential problem areas.
The number of owners doesn’t necessarily matter with a Porsche – the work and records performed do. Many owners are enthusiasts and will keep all the invoices from service or repairs performed.
If a seller wont let you inspect the car, walk away.
Consider who is selling the car. For a private sale you need to know why the vehicle is for sale. If you’re buying from a used car dealer, do your research to learn where the dealer got the car. If it’s a dealer that specializes in Porsche, well and good. However, if the dealer’s normal trade is low cost mini vans, you need to do some serious thinking. Who trades there Porsche for a cheap mini van? The owner that has a serious problem and knows the mini van dealer wont find it?
Mileage and Service History
On cars approaching 15 years old, higher mileage is not necessarily a bad thing. In fact, a 997 Carrera that has been well used, could be in a better condition than one that has an attractively low mileage reading. Low mileage cars can have hidden issues although rarely is the 997 used as a daily driver, so 10,000 per year would be considered higher mileage.
You’ll want to take a good look through any documented history available. A clear pattern of servicing on higher mileage cars is essential. If you’re considering buying a lower mileage 911 Carrera 997, timed intervals between service is the key thing to look for regardless of mileage.
Attractive Low Mileage – not so fast.
It’s always great to find a low mileage car, however, the low miles can present a different set of challenges to cars that are designed for 10K miles per year.
Low mile examples often miss their regular service intervals. This can cause time related degradation of the service items to be overlooked. Despite a lack of mileage, wear and tear will take place in fluids, tires, brakes, clutch surfaces and oil seals. Look to see when the last time the plugs were changed – 10 years is the limit regardless of mileage. The brake fluid should be flushed every 2 or 3 years. Check the DOT on the tires – lots of tread doesn’t mean they’re healthy. See more examples below.
Clearly low mileage cars attract extra money for the purchase, but make sure you plan additional budget for service work after you purchase the car.
The Potential Issues To Be On The Look Out For
Codes and over-revs
Before buying a 911 997, it is essential to know when the last time the system fault codes were cleared and check the status of the emission monitors. It’s not difficult for a seller to clear the faults just before you arrive for a test drive. Clearing the engine faults also resets the emissions system to a state of “not ready.” Emission readiness tests often occur over multiple drive cycles. So, after a reset, faults may not return for a significant number of miles. Again, this is easy for a competent repair shop to check or indeed the DIYer using a handheld scanner.
It is essential to determining the health of the engine to be able to read this data.
How hard has the car been driven?
Taking the engine to the red line for RPM is a good thing, but going over the red line obviously can cause damage. A gear change at red line will actually cause the revs to increase slightly momentarily – nothing bad here. But, if you select the wrong gear, the engine revs to go way over the red line. This is the famous “miss-shift” that has caused many engine explosions.
Porsche engine management records many things – one of the most significant is an over-rev situation. Data is permanently stored within the ECU showing running hours and when engine events have occurred. There are six levels of over-revs recorded ranging from the engine being red-lined through to what would be a potentially catastrophically high RPM event. Events in the first category suggests the car has been properly exercised, but events in the higher categories could be hiding a potential life shortening engine situation.
Many Porsche owners like to go to track days. On the track, gear changes will occur right around the rpm maximum red line. These events will be recorded if they reach the lower levels of the over rev counter. Multiple recorded events in the lower over-rev categories could be a sign of how much track time the car has experienced.
IMS Bearing – Early Production Cars
There’s a lot of hype noise about the IMS bearing failure associated with Porsche engines. The majority of failures occurred on the M96 engine used in the 996 911 and 986 Boxster.
In general the 997 was shipped with the revised M97 engine that has an improved non-serviceable IMS bearing and does not suffer the failures associated with the earlier 996. There are however, some early M97 engines that do contain the serviceable IMS bearing that is more prone to failure.
These engines are restricted to the very early production cars usually in 2006. Cars after that time have no known problems with the IMS until it was completely removed in the DFI engine from 2009 – worth checking the production date stamped on the driver door for clarity of the manufacturing date. If in doubt, use the vin number and talk to a friendly Porsche parts person. From the vin, they should be able to clarify if the car had a serviceable or non serviceable bearing.
Overheating – Cracked Cylinder Liners 997.1
Each cylinder bore in the engine case half is lined with a one-piece sleeve or liner. The M97 flat 6 engines fitted in the earlier 997 are subject to cracks in the liners of the cylinders.
Results from a crack vary, but typically the most common is coolant loss with subsequent engine overheating. Sometimes, a crack in the cylinder liner can take a considerable amount of running time to fully open and cause problems.
How to find out?
This is not an easy one because initially the coolant loss through this problem can be very slight. Also, tests when the car is cold do not reveal the problem – typically the crack in the liner only opens when the car is hot. It is the likely cause of most of the other problems, such as cylinder scoring, so worth paying time to identify this problem.
If you want to tackle it yourself, then this is a procedure that can shed some light on the issue. First, note the coolant level when the engine is cold. Take your time here – you want to drive the car for 30 mins. After driving the car, let it sit and idle for a while. The front radiator fans should come on and the engine should maintain a steady temp. If the engine continues to warm and will eventually overheat, walk away.
Turn off and take a look at the coolant level – it should have risen and be falling back toward the cold level. If the level has gone down or is still at the cold level, there could be a small coolant loss through a cracked liner. The trained nose can smell coolant from the exhaust when the engine is running. A Porsche repair shop can definitely help here.
Note, this isn’t a definitive test because you could be loosing coolant through an external system leak. However, any loss of coolant after a drive cycle should be thoroughly investigated.
If you’re considering buying an earlier 997, lift the car and have a listen from below while the engine is running. You might need a repair shop to do that for you. You’ll hear the M97 flat 6 engine in the 997 make a consistent ticking sound.
Much of this sound is the proximity of your ear to the valve train and the exhaust headers. However, there is a distinctly different sound that identifies with a particular issue that you don’t want to hear.
The M97 engines are subject to cylinder scoring – deep gauges in the cylinder liner, usually associated with a knocking noise and eventually catastrophic engine failure. The root cause of this issue is open to discussion, however, wear in the piston rings and liners causes the piston to wobble. The wobble occurs at the bottom of the stroke and results in the piston skirt dragging against the cylinder wall thereby scoring the liner.
The sound your listening for is not a tick; it’s a rhythmic knock and usually shows up first on the passenger bank of the flat 6 engines – although, it can appear on any cylinder. The rhythmic knock is the piston changing position at the bottom of the stroke and hitting the liner.
No Ticking – Early Signs
One of the potential early signs for significant engine problems is a mismatch in the sooty deposits inside the exhaust tailpipes. This clearly shows a difference in the running efficiency of one bank of cylinders versus the other and further investigation for the cause is necessary. A car with one black sooty tail pipe and one clean tail pipe is not a car to buy.
If you hear this noise and the price of the car is zero dollars, you’ll still need approx. $20K to fix the problem!
Front radiators and air-conditioning condensers
The design of the 997 has the placement of the coolant radiators and air-conditioning condensers low down in the front bumper. The position and open vent nature of the design leaves them not only susceptible to stone impacts, but also to the buildup of debris and dirt stuck close to the radiators.
These front ducts and debris need to be cleaned out regularly or protected by an aftermarket screen. The front bumper has to be removed to reach the radiators and most owners never do it as part of regular service.
Take a flash light and look closely to see whether the front air intakes are full of rotting leaves and debris when you inspect the 997. Look closely, the debris will be around the sides of the radiators.
Damaged or corroded radiators and AC condensers cannot be repaired and must be replaced.
Suspension and Tires
The suspension on the 997 is very reliable. The ride quality varies a little between the early versions and the later ones. Modifications to the design of the suspension for the release of the 997.2 made the car a little more subtle and better balanced.
Naturally, over time wear can occur in plastic or rubber bushings that help to cushion the ride. Listen out for squeaks or clunks over bumps and check for leaks from the suspension struts.
Worn suspension components will typically show up as uneven tire wear. Check the tires thoroughly for smooth wear patterns. In particular, take a good look at the inside shoulders of the rear tires. Many owners miss this wear because it’s so far under the car. Rear tires are not cheap to replace.
The brakes on the 997 are excellent. Brake pad material does degrade over time, so on low mileage examples check to see when the last brake service was performed. The brake fluid should be changed every few years regardless of mileage.
A complete brake service with pads, rotors and sensors can be quite expensive. So, if you’re buying from a used car vendor, look for new pads on old rotors. Both the pads and rotors should always be changed at the same time.
There should be a wear lip on the rotor and the size of that lip will determine how much mileage remains. Worn rotors crack or disintegrate, which can be particularly unpleasant when driving!
The 997 came with drilled rotors. Look carefully to see how clear the holes are and make sure there are not cracks between the drill holes. Cracks between the drill holes can lead to a much bigger crack and rotor failure very quickly under heavy braking.
Porsche Ceramic Composite Brakes
The ceramic brake setup was a factory fitted option for the 997 and generally seen on the S, Turbo and GT models. Porsche Ceramic Composite Brakes (PCCB) use cross-drilled, carbon fiber reinforced ceramic discs with special composite pads. They produce amazing stopping power and are 50% lighter than a standard brake a setup. They also have a considerably longer life than their standard counterparts. However, the expected life of the PCC brakes does not always play out in reality.
If you are buying a Porsche 911 997 that has the PCCB option, it’s worth being certain how much life remains on the brakes. Parts for the front brakes alone could run you more than $10,000. Sounds like a good reason for selling a car!
Rush Out and Pick One Up Today
The earlier 997 is a bargain for so much car – you can easily have a day out at the track and go out to dinner with it in the evening. The 997.1 comes with a little more risk than the 997.2 version, however, there are less of the later version available as new car sales had decreased significantly during it’s production launch. Therefore, the 997.2 commands a little bit of a premium but comes with less of the potential problems.