When Porsche first introduced the water-cooled 996-generation 911, it stirred up controversy among purists. But with the arrival of the 997 in 2004, Porsche had a chance to address the criticisms and refine their formula. The 997 generation retained much of the 996’s DNA, but brought key improvements that set it apart.
In this article, we will discuss the improvements made to the 997, its common problems, and its overall reliability.
Improvements from the 996 to the 997
While the 997 is considered to be a major improvement in the 996’s reliability, it’s not without some common problems you should be aware of.
The most noticeable change was the return to Porsche’s iconic round headlights, replacing the “fried egg” design that divided fans. This update alone helped restore the 911’s classic look and broad appeal, but Porsche went beyond cosmetic fixes, focusing on tangible improvements to the driving experience.
While both generations share most of the same mechanical and aesthetic features, Porsche knew they needed to make a few changes to save the 997. Infamous issues such as the dreaded IMS-bearing failure had tainted the public opinion of the 996, so Porsche emphasized making this generation more reliable.
However, there is one major asterisk on the 997’s reliability. Some of the early 997 models (before 2007) came with the same IMS bearing assembly and issue as its predecessor. The issue was almost immediately fixed, but prospective buyers should be aware when looking at models prior to ‘07.
Common Problems on 997 Porsche 911s
Faulty Alternator Cable
Some early 997s came with faulty alternator cables, which decreased the life of the battery. Most of the 997s on the resale market should have already had it replaced, but it’s a good thing to look out for.
Possible symptoms of a bad alternator cable include:
- Decrease in battery life
- Battery dies easily
- Weak accessory power
- Dim lights
The replacement process is fairly cheap and easy on paper, but installing it has been known to be difficult due to the tight engine bay and routing holes.
Cracked Coil Packs
Cracking in the coil packs has been a common issue on these cars. Over time th plastic will wear down and eventually crack. A cracked coil pack means the car may be unable to produce adequate spark for the combustion cycle. This can cause misfires and other issues down the line.
Some symptoms you might notice with cracked coil packs include:
- Rough idle
- Misfire codes
- Louder than normal engine noise
- Lack of power
- Gas warning light when the tank is full
Leaking Radiator
A well-documented weak spot of the 997 is its tendency to leak from the radiator. The issue also happens in the a/c condensers. You should have them inspected regularly during routine maintenance and replace them if necessary.
Some symptoms of a leaking radiator include:
- Smell of burning coolant
- Visible leaks
- Engine overheating
- Check engine light
Over-Rev Codes
One of the most useful tools from Porsche, and the scariest to use, is their over-rev database. Every 997 has a list of every instance of the engine over-revving since the day it was rolled out of the factory. This can be a great way for owners to prove their car has been taken care of and not abused, but it can be a source of horror stories for others when they see what the previous owner has logged.
Owners aren’t the only ones who can check this. Porsche dealerships will look at your over-rev list for warranty purposes and will deny you coverage under certain conditions, so it’s important to have it looked at in a pre-purchase inspection.
So is the 997 Reliable?
Yes, the 997-generation 911 is widely regarded as one of the most worthwhile Porsche purchases. It retains much of what made the 996 new and exciting, with a level of refinement and reliability its predecessor lacked.
While the platform is definitely one of the more reliable ones to sport a Porsche badge, the biggest factor is maintenance history and how it’s been driven. High mileage, lacking service records, and a questionable over-rev list are all signs of a 997 that you might want to keep at an arm’s distance.
Porsche Service in Post Falls, ID
Porsche is at the pinnacle of German automotive engineering. More than other European brands, servicing a Porsche requires a deep understanding of the vehicle and its systems. Luckily, Mark’s Automotive is equipped with the necessary tools and technicians who care for your Porsche. From 911s to Cayennes, Mark’s Automotive is Post Falls’ Porsche dealership alternative. Give us a call or schedule an appointment today